Components

Redesigned by the world’s fastest racers, for the world’s fastest racers, you want BoXXer in your corner. The all-new 38mm chassis is equipped with the DebonAir+ twin tube air spring that will have you thinking it’s a coil. Paired with a Charger 3 RC2 damper tuned for downhill speed, BoXXer Ultimate takes you straight to the top step of the podium. And with our new crown adjustment lines, setup is a breeze—no rulers required. FEATURES - 38mm chassis designed to meet the needs of the world’s fastest racers with balanced stiffness and ride quality - DebonAir+ twin tube air spring strikes the perfect balance between butter-smooth small bump feel, added support throughout the travel, and taller ride height for confidence when things get steep - Signature colorway BoXXer Electric Red with an all-new graphics package - RockShox premium fender compatibility (RockShox Bolt-On Fender included with purchase) - Lightweight machined and anodized crown for premium looks and durability - Crown height gradient creates a visual guide to simplify setup, no ruler required - Charger 3 damper tuned for BoXXer’s updated chassis and spring. Featuring High Speed Compression, Low Speed Compression, and a revamped Low Speed Rebound, every click is meaningful and exact. This allows the rider to tune to perfection with every click. - ButterCups block 20% of high-frequency “trail chatter” to reduce hand and arm fatigue, leaving you feeling fresh with more control - Ultra-low-friction SKF wiper seals provide long-lasting fork performance and improve overall suspension feel - Maxima Plush damping fluid reduces friction and silences damper noise - Maxima Plush Dynamic Suspension Lube reduces friction, lasts longer, and enhances suspension performance ride after ride

The Bora Ultra WTO 35 has the shallowest wind tunnel optimized (WTO) rim profile of the new Ultra wheel family, redesigned to maximize aerodynamics and reduce weight. These wheels are an Italian masterpiece, refined through rigorous testing and proud craftmanship to be a leader in their space. Every external component of the wheel has been redesigned to maximize aerodynamic efficiency and reduce weight, saving you precious energy and generating greater speed from the same rider input. Campagnolo’s CULT ceramic bearings spin effortlessly within the front disc hub’s aerodynamic carbon body, and the 2-Way Fit rims are ready for immediate tubeless use without rim tape. - 35mm deep, UD high-strength carbon rim construction with C-LUX finish, 2-Way Fit system and 23mm internal width can accommodate wider tires, including tubeless - Bora ULTRA disc brake hubs and CULT ceramic bearings, 21 Aero Elliptical, straight-pull double-butted spokes - Possess pure control with G3 lacing, designed to ensure maximum stiffness and cornering precision – and stunning, premium aesthetics - Recommended tire size: 700c, 28 - 35mm - Includes Aero Mo-Mag nipple maintenance kit, Tubeless valve, AFS lockring, Campagnolo wheel bag, Campagnolo accessories bag and tire levers

Excellent aerodynamics and safe steering behavior for a decisive competitive advantage; the ARC 1100 DiCut wheels are made to go flat out fast. Drag and steering movements are reduced thanks to the AERO+ rim that's been aerodynamically optimized by Swiss Slide- these high-end quality wheels are ready to win.

At only 33mm deep, the Campagnolo Bora Ultra WTO 33 has the shallowest wind tunnel optimized (WTO) rim profile of the Ultra family. Every external component of the wheel has been redesigned to maximize aerodynamic efficiency and reduce weight, saving precious energy, and generating greater speed from the same rider input. - The Bora Ultra WTO 33’s lower weight helps riders to reach heights even faster, change pace instantly, and descend with great speed and confidence - Rims are crafted from Campagnolo’s Hand Made Ultra-Light Carbon (H.U.L.C.) - Rims feature Campagnolo’s mirror-like Luxury (C-LUX) finish - Undrilled 2-Way Fit rim beds allow for perfect tubeless compatibility without rim tape - Carbon fiber front hub body is hourglass shaped to improve aerodynamics, and is securely bonded to a light aluminium hub flange - Integrated radial spoke seats ensure perfect alignment

Campagnolo’s Bora Ultra WTO 45 has the perfect balance of speed, agility and stability, making it the best choice for all-round riders. The rim’s versatile design takes account of real-world riding conditions, not just those created in a wind tunnel, and the result is the most efficient drag-reducing rim shape available. - Lightweight, thanks to its Hand Made Ultra-Light Carbon (H.U.L.C.) construction - Slimmer Aero Elliptical spokes and hidden nipples help slice through the air - Hub body is securely bonded to a light aluminium hub flange - Integrated radial spoke seats ensure perfect alignment - A uniquely stunning C-LUX finish and new, subtle Bora Ultra graphics ensure the wheels have the show to match their go - Ceramic bearings spin effortlessly within the front aerodynamic carbon body of the disc hub - The 2-Way Fit rims are ready for immediate tubeless use without rim tape, designed for tire widths from 23mm - Aerodynamically optimised for 25mm tires - Weight: 660 g

Target locked on the top step of the podium and developed in the crucible of World Cup competition, the 40 is the definitive DH race fork. FOX's GRIP X2 is the most tunable, supportive, and smoothest descent-focused damper they've created, ensuring the 40 stays planted in the hot seat - GRIP X2 is the most tunable, supportive, and smoothest descent-focused damper FOX has created - Riders reap the benefits of sitting higher in the travel while tires stay glued to the ground, cornering with increased traction, and experience reduced fatigue - Lower leg bleeders allow atmospheric pressure equalization at the push of a button, and the bypass channels increase volume to alleviate pressure ramping as the fork moves through its travel for better fork performance by increasing small bump sensitivity and responsiveness - The lower leg arch design of the 40 maximizes strength and steering stiffness for downhill performance while adding no unnecessary weight - Fitted with the proven and reliable FLOAT EVOL air spring - Floating thru axle allows perfect chassis alignment and reduces unwanted friction between the upper and lower fork legs, providing much smoother suspension movement throughout the entire range of travel - Kashima Coating on upper tubes for added durability

- Campagnolo's first dedicated gravel wheel - UD carbon fiber with laquerless finish, ASTM 2 & DIN EN 17406 Category 2 certified - Proprietary 2-way fit technology, no need for tubeless tape - Asymmetrical rim profile with mini-hook to sustain higher pressures on smaller tires, 25mm internal width can handle 38mm up to 76mm tires - 1485g wheelset weight, 120kg weight limit

The CADEX 65 WheelSystem is for cyclists seeking maximum aero performance and stability without compromising on grams. Featuring a rim design and aero carbon spokes that maximize aerodynamics in shifting winds and to significantly reduce overall weight, the CADEX 65 also employs a low-friction hub that drastically diminishes power loss. - Rim design helps reduce aerodynamic loss and, through a continuous carbon fiber structure, enhances overall durability - Custom-tuned aero carbon spokes offer excellent aerodynamic characteristics, superior stability in shifting winds, and ultra-light weight - Custom-tuned dynamic balanced lacing technology makes a stiffer, more efficient wheel designed for real-world applications - Precision reinforced carbon lay-up places carbon fiber only where needed, creating an exceptionally solid structure without adding any unnecessary grams - CADEX-specific brake pad features a specifically designed channel to optimize water displacement as well as an all-new compound, allowing the pad to conform better to the brake track, resulting in more precise and effortless braking - Low friction hub eliminates bearing friction, reducing potential watt loss

The ultimate in cockpit data integration. Personalize your ride and your data with RED AXS controls and the Hammerhead Karoo. Use Bonus Buttons to scroll your head unit or shift your derailleur from our most comfortable controls. FEATURES: - Aftermarket kit includes: Hammerhead Karoo, left and right Shift-Brake System controls, and flat mount calipers - Compatible with all generations of AXS derailleurs

E30 HD wheelsets offer the perfect balance of stiffness, performance, durability, and weight. Achieve more traction and stability to increase confidence while squaring off turns and diving for the inside lines; these wheels deliver quick acceleration and pop to get the entire bike lofted into the air and carry momentum over the toughest obstacles. - Designed for Trail, all-mountain and enduro E-riding - Reinforced rim bed for impact resistance - Asymmetrical rims build stiffer, stronger and more reliable wheels by improving the bracing angles and equalizing the spoke tensions between the drive and non-drive side spokes. - Rated for e-bike use - Built with Industry Nine Hubs

Reserve 30 wheels feature a 30mm internal width that supports 2.3-2.5" tires, and the thick rim beads stand up to the abuse of tough, rocky, steep tracks ridden at elite speed. While DH rims see greater single impacts, nothing beats the full weekend of regular abuse that an EWS race dishes out. To say nothing of the infamous 'Anti-Grip' and the rocks buried within the moondust in the Andes of Chile. - Designed for DH riding and racing - Carbon fiber construction with 4mm asymmetric offset - Reinforced rim bed for impact resistance - Rated for e-bike use - Ships with rim tape installed, tubeless-ready valves, and cards identifying the builder of each of your wheels - Backed by a lifetime warranty - Built with Industry Nine Hubs

Reserve 30 wheels feature a 30mm internal width that supports 2.3-2.5" tires, and the thick rim beads stand up to the abuse of tough, rocky, steep tracks ridden at elite speed. While DH rims see greater single impacts, nothing beats the full weekend of regular abuse that an EWS race dishes out. To say nothing of the infamous 'Anti-Grip' and the rocks buried within the moondust in the Andes of Chile. - Designed for DH riding and racing - Carbon fiber construction with 4mm asymmetric offset - Reinforced rim bed for impact resistance - Rated for e-bike use - Ships with rim tape installed, tubeless-ready valves, and cards identifying the builder of each of your wheels - Backed by a lifetime warranty - Built with Industry Nine Hubs

Reserve returns with the ultimate climbing wheelset; the 34/37 Turbulent Aero. Developed using Turbulent Aero data and technology, the 34/37 TA is designed to help get you up those mountain passes as fast as possible. Comparted to the original 34/37, the revised TA set is 30 grams lighter per rim, and 4 grams faster in the wind tunnel. And in keeping with Reserve workmanlike ways, you’ll find external nipples, standard spokes, no tire limitations with a semi-hooked design and no rider weight limits. - Designed to be your no fuss climbing wheelset. There are no weight limits, no tire limitations, and can be set up tubeless or with tubes - Mixed profile front and rear rims provide maximum stability, lowest weight and optimized aerodynamics - Internally reinforced spoke holes to strengthen the area where the rim sees the most force, around the spoke nipple. This provides for improved strength without adding unnecessary weight - Lifetime warranty supported by a no-fault crash replacement - Built with DT Swiss Hubs

Bringing cutting edge performance to the diverse needs of drop bar off-roaders, Reserve’s 40/44 GR gravel wheels are tailored for the demands of off-road exploration and gravel riding, but with an aero focus. Leveraging Turbulent Aero technology, the 40/44 GR features a 40mm front paired with a 44mm rear, establishing it as the fastest and most stable Reserve gravel wheelset to date. Wider than the previous gravel wheels to allow for tires up to 50c tires, the 40/44 GR plays nicely with today’s slew of big volume gravel tires and a semi-hooked rim makes tubeless set up easier than ever. - Designed to be your no fuss aero gravel riding and racing wheelset - Wider internal width of 27mm - Tubeless and tube compatible - Wide/low front mixed with narrow/tall rear for maximum stability, lowest weight and optimal aerodynamics - Internally reinforced spoke holes to strengthen the area where the rim sees the most force, around the spoke nipple. This provides for improved strength without adding unnecessary weight - Built with DT Swiss Hubs

Developed and tested using Turbulent Aero technology, the 42/49 is designed for everything you do, providing all-day capability with aerodynamic sensibilities. Raced at events as varied as the Paris-Roubaix and the Giro D’Italia, the 42/49 wheels have a lifetime warranty supported by a no-fault crash replacement. And in keeping with Reserve workmanlike ways, you’ll find external nipples, standard spokes, no tire limitations with a semi-hooked design and no rider weight limits. - Wind tunnel tested using Computational Fluid Dynamics (CFD), with the goal of maximizing aerodynamics while enhancing stability - Optimized carbon fiber rim construction allows Reserve to define the exact fiber orientation for each rim model, to maximize stiffness and strength without sacrificing weight - Built with DT Swiss Hubs

E30 HD wheelsets offer the perfect balance of stiffness, performance, durability, and weight. Achieve more traction and stability to increase confidence while squaring off turns and diving for the inside lines; these wheels deliver quick acceleration and pop to get the entire bike lofted into the air and carry momentum over the toughest obstacles. - Designed for Trail, all-mountain, and enduro E-riding - Reinforced rim bed for impact resistance - Asymmetrical rims build stiffer, stronger and more reliable wheels by improving the bracing angles and equalizing the spoke tensions between the drive and non-drive side spokes. - Rated for e-bike use - Built with Industry Nine Hubs

The Bora Ultra WTO 35 has the shallowest wind tunnel optimized (WTO) rim profile of the new Ultra wheel family, redesigned to maximize aerodynamics and reduce weight. These wheels are an Italian masterpiece, refined through rigorous testing and proud craftmanship to be a leader in their space. Every external component of the wheel has been redesigned to maximize aerodynamic efficiency and reduce weight, saving you precious energy and generating greater speed from the same rider input. Campagnolo’s CULT ceramic bearings spin effortlessly, and the 2-Way Fit rims are ready for immediate tubeless use without rim tape. - 35mm deep, UD high-strength carbon rim construction with C-LUX finish, 2-Way Fit system and 23mm internal width can accommodate wider tires, including tubeless - Bora ULTRA disc brake hubs and CULT ceramic bearings, 21 Aero Elliptical, straight-pull double-butted spokes - Possess pure control with G3 lacing, designed to ensure maximum stiffness and cornering precision – and stunning, premium aesthetics - Recommended tire size: 700c, 28 - 35mm - Includes Aero Mo-Mag nipple maintenance kit, Tubeless valve, AFS lockring, Campagnolo wheel bag, Campagnolo accessories bag and tire levers

Envision riding the fastest line, a rocky ridge or over a nasty field of roots without fear. The EXC 1200 Classic supports your most daring line choices, with still plenty of reserve if they don’t go to plan. Our unique process provides maximum carbon compression to push durability further than ever before. A patent-pending technique for layer-by-layer quality control ensures minimized imperfections straight out of the mold, to maximize your commitment. A lighter front rim has 28 DT revolite spokes, while the more durable rear rim has 32. The high- engaging Ratchet DEG makes for a smaller idle distance, crucial for acceleration out of corners. Get ready to push on the stages and break your limits. - Carbon, Hookless tubeless TSS rim with 30mm inner width - DT Swiss Revolite spokes and 180 classic hub - Ratchet DEG with 90 tooth ratchets

The GRC 1100 DICUT gravel wheels are designed for multiple situations, with two rim height options available to meet your needs. Whether you’re on the hunt for a win in a fast-paced gravel race with the 50mm high rim, or looking to unhook yourself from your limitations on an extreme off-road adventure with the 30mm high rim, these wheels are sure to catch the eye, while saving weight with improved aero-optimization. - Built using a state-of-the-art carbon manufacturing process, resulting in lightweight carbon rims straight out of the mold, without the need for a finishing coat - Assembled with the lightweight 180 DICUT hub with ceramic bearings and DT Aerolite spokes, providing fast acceleration and low rolling resistance - Intended use = Gravel/Off-road - Ratchet EXP freehub drive system - Includes tubeless valve, tape and wheel bag - Tubeless ready, 24mm wide carbon rim with 30mm high profile rim

The GRC 1100 DICUT gravel wheels are designed for multiple situations, with two rim height options available to meet your needs. Whether you’re on the hunt for a win in a fast-paced gravel race with the 50mm high rim, or looking to unhook yourself from your limitations on an extreme off-road adventure with the 30mm high rim, these wheels are sure to catch the eye, while saving weight with improved aero-optimization. - Built using a state-of-the-art carbon manufacturing process, resulting in lightweight carbon rims straight out of the mold, without the need for a finishing coat - Assembled with the lightweight 180 DICUT hub with ceramic bearings and DT Aerolite spokes, providing fast acceleration and low rolling resistance - Intended use = Gravel/Off-road - Ratchet EXP freehub drive system - Includes tubeless valve, tape and wheel bag - Tubeless ready, 24mm wide carbon rim with 50mm high profile rim

If you're looking to get away from the hustle and bustle and explore unknown territory, the HXC 1200 Spline is the ideal choice for you. The lightweight carbon fiber wheelset for electric mountain bikes will take you to new heights, while the sturdy and durable rims will help you conquer steep alpine rocks. Through a new process, maximum carbon fiber can be achieved, and the patent-pending laminated quality control technology ensures that the rims are flawless when they come out of the mold, allowing you to ride your electric mountain bike without any worries. Trapped in the middle of nowhere. Equipped with the Ratchet EXP OS ratchet system and 28 DT complite HY spokes specially designed for electric vehicles, just turn on the power, step on the pedal, and you can start freely . - Carbon, Hookless tubeless TSS rim with 30mm inner width - DT Swiss Complite Hybrid T-head spokes and 180 hub - Ratchet EXP OS with 42 tooth ratchets

The XMC 1200 Spline is the ultimate all mountain wheel. A carbon layup specifically tuned for all mountain use makes the rim tough yet super-light. The hubs feature the latest incarnation of DT's Ratchet System. Extremely refined machining and fully lasered graphics make them the lightest hubs DT Swiss has ever made. Together with bladed top-end spokes and perfect DT Swiss build quality, this wheel is made to ride trails with speed and confidence. - Requirement-specific carbon rims are designed for the ultimate all-mountain riding experience - The carbon rim combined with the DT Aerolite and DT Aero Comp spokes ensure perfect wheel stiffness - The low weight of the 1200 Spline reduces the moment of inertia and increases acceleration, leading to higher average speeds compared with aluminum wheels with the same energy input - Alloy presta valve is lightweight - Wheels are tubeless ready, with a rim design that ensures a precise and safe fit of the tire even when ridden hard - Nipples have DT Pro Lock to prevent the spoke-nipple connection from loosening

The new standard in modern day, high performance cross country wheelsets. With its hookless full carbon and tubeless ready rim, the XRC 1200 strikes a perfect balance between lightweight and aggressive riding-readiness. Its intricately machined hubshell is superlight while the 25mm tall rim has the inherent stiffness necessary for efficient riding and to precisely hold a line. Together with the renowned DT Swiss build quality, this wheel really sets the benchmark for going fast up and down, whether it's between the tape or not. - Tubeless ready wide and light carbon rim - 180 Ratchet EXP 36pt hub with straight-pull DT spokes, 3-cross pattern - Factory installed tubless-ready tape - Includes tubeless valve, 6-bolt rotor adapter, XD and MicroSpline freehub bodies, tools and wheel bag

Built for the best riders, ridden on the hardest tracks, ZEB rules the world’s toughest enduros. With Flight Attendant, ZEB Ultimate redefines how far you can go on an enduro bike. The groundbreaking automatic suspension system has an improved algorithm with all new personalization to match your riding preferences, your terrain, your style, and your physical capabilities. ZEB also rides on the Charger 3.1 Flight Attendant damper for the right balance of comfort, control, and speed. Features NEW Remove suspension complexity to elevate your ride experience. Flight Attendant has an all new algorithm that uses a suite of sensors to read rider and terrain inputs to anticipate the perfect suspension position. No other suspension system has this level of personalization to match your riding preferences, your terrain, your style, and your physical capabilities. Elevate your ride. NEW Flight Attendant features include fork-only update for hardtail bikes, Launch Control, and customizable Auto Mode to disable "Pedal" or "Lock" positions. NEW To meet the demands of the world’s best riders, Charger 3.1 Flight Attendant electronic automatic damper is a brilliant evolution of our proven Charger 3 damper platform. With a refined compression range, the Charger 3.1 Flight Attendant damper gives you the traction, control, and comfort you need to charge dicey lines all day. NEW Ever on the quest to eliminate friction, a new bushing package further reduces friction with an updated process at the factory level to give riders a better feel right out of the box. Available in NEW Electric Red Signature colorway or Ultimate High Gloss Black. ButterCups block 20% of high frequency “trail chatter”. Limiting these vibrations massively reduces hand and arm fatigue leaving you feeling fresh with more control. DebonAir+ air spring is built to strike the perfect balance of what riders really want: a butterlike small bump feel, increased air volume to add support throughout the travel, and higher overall ride height for more confidence when things get steep. Maxima Plush Dynamic Suspension Lube reduces friction, lasts longer, and enhances suspension performance ride after ride. Bolt-in torque cap adapters now included for use with standard hub end caps. Lightweight machined and anodized crown for premium looks and durability. Ultra-low friction SKF wiper seals provide long lasting fork performance and improve overall suspension feel. Short fender compatibility. (RockShox fender included)

The XX Eagle AXS E-Bike Transmission groupset has the strength to handle big enduro days with the weight to make it manageable. SRAM’s Transmissions take a holistic approach to a bicycle shifting, an entire system synchronized, providing you with a superior ride experience. Shifting under load is made possible on the XX cassette due to a combination of X-SYNC technology and cassette mapping, creating seamless shifts even during your hardest power output. T-Type chainrings and come with a clip-on guard. Specifically engineered to optimize Eagle Transmission, the XX Eagle Transmission Flattop Chain features a unique flat top for shifting performance and robustness. Featuring a “click and fire” two-button design, The AXS Pod Ultimate transforms the crucial act of rider inputs into a vastly more personal experience for all your AXS controls. - Includes clip-on guard and 104BCD 36T ring. Crank arms not included - XX Eagle Transmission derailleur - 10-52T XX Eagle Transmission cassette - XX Transmission Flattop chain - Pod Ultimate controller - AXS battery/charger

Rims: WTB CZR i30 Carbon 29" - ETRTO 622-30 - Inner width: 30mm - Made from Torayca T700 UD carbon fiber, striking a fine balance between stiffness and compliance - Asymetric and angled spoke hole drilling distributes spoke tension more evenly - Externally reinforced spoke bed - Drilled for Presta valve - TCS 2.0 Tubeless System compatible - Solid Strip (included) - 32 holes Front hub: Sram 900 Boost - 15x110mm Thru-Axle (Axle not included) - 6 Bolt Disc Mount - Sealed cartridge bearings Rear hub: Sram 900 XDR Boost - 12x148mm Thru-Axle (Axle not included) - 6 Bolt Disc Mount - Sealed cartridge bearings - Sram Double Time 4-Pawl Ratchet Freehub, 52 Points of Contact, 6.9 degree engagement angle - Compatible with 11,12 speed XD (1.85mm spacer included) Sold in Pair, including: - Tubeless Valve (x2) Assembled in North America by experienced wheelbuilders with Sapim Race spokes (Black), 14mm Brass Polyax Nipples (Black)

At only 33mm deep, the Campagnolo Bora Ultra WTO 33 has the shallowest wind tunnel optimized (WTO) rim profile of the Ultra family. Every external component of the wheel has been redesigned to maximize aerodynamic efficiency and reduce weight, saving precious energy, and generating greater speed from the same rider input. - The Bora Ultra WTO 33’s lower weight helps riders to reach heights even faster, change pace instantly, and descend with great speed and confidence - Rims are crafted from Campagnolo’s Hand Made Ultra-Light Carbon (H.U.L.C.) - Rims feature Campagnolo’s mirror-like Luxury (C-LUX) finish - Undrilled 2-Way Fit rim beds allow for perfect tubeless compatibility without rim tape - Oversized 36 tooth ratchet freehub is fast to engage and very durable, plus it accepts N3W, XDR, HG freehub bodies - Integrated radial spoke seats ensure perfect alignment

Featuring the new generation Ratchet System hubs that are lighter and faster than ever before, along with bladed spokes and the superb wheel build quality and reliability you expect from DT Swiss, the XRC 1200 SPLINE 25 is a race-bred trail machine that loves to go fast. It accelerates like nothing else, tracks like nothing else, and is reliable like nothing else. It is the benchmark for high speeds on any trail, on any gravel road, and in any race — whether that race takes place between the tape or in your head. - SRAM XD MTB cassette-compatible

The new standard in modern day, high performance cross country wheelsets. With its hookless full carbon and tubeless ready rim, the XRC 1200 strikes a perfect balance between lightweight and aggressive riding-readiness. Its intricately machined hubshell is superlight while the 25mm tall rim has the inherent stiffness necessary for efficient riding and to precisely hold a line. Together with the renowned DT Swiss build quality, this wheel really sets the benchmark for going fast up and down, whether it's between the tape or not. - Tubeless ready wide and light carbon rim - 180 Ratchet EXP 36pt hub with straight-pull DT spokes, 3-cross pattern - Factory installed tubless-ready tape - Includes tubeless valve, 6-bolt rotor adapter, XD and MicroSpline freehub bodies, tools and wheel bag

This is an updated version of the 3D-Printed Ti OSPW for Shimano 9100/8000. This new design has an integrated stop tower for easier mounting. The CeramicSpeed Oversized Pulley Wheel System has been proven to be the fastest pulley system in the world, providing energy savings starting at 2.4 watts over standard Shimano systems. The OSPW System for Shimano 9100/8000 is an industry-leading product, chosen by many of the world's leading cycling teams and professional triathletes. Featuring a 13-tooth upper pulley wheel and a 19-tooth lower pulley wheel to provide absolute optimization of the rear derailleur, the upper and lower oversized aluminum pulley wheels are fitted with coated CeramicSpeed Bearings for even longer lifetime and lower friction. Please note: The 9100/8000 system is not compatible with Ultegra 8000-GS or 8050-GS (medium cage) derailleurs, nor is it compatible with clutch-equipped Ultegra RD RX800 & RX805. Please see CeramicSpeed's Shimano 11 Speed Pulley Wheels for a compatible upgrade. - The overall power savings of the OSPW System for Shimano 9100/8000 reach 30%-60%, or more in some cases, over a stock setup. - The oversized pulley wheels have 3-5 times longer lifetime than the commonly used standard pulleys on the market. - The Shimano 9100/8000 OSPW system is compatible with up to a 32-tooth cassette for both Dura Ace & Ultegra derailleurs. In The Box: - A complete 3D-printed 13-tooth/19-tooth OSPW System - CeramicSpeed Bearing Oil in 15ml dropper bottle