Rear

The Box One Prime 9 Rear Derailleur takes the advantages of our legacy 9-speed drive-train but adds the advancements of a modern 1 by; a fully adjustable Tri-Pack Clutch, and an x-wide cage optimized for an 11-50T cassette. Forged construction steps up the durability and performance to an unparalleled level. Suited for the most demanding terrain.

The Campagnolo Chorus 12-speed rear derailleur features 3D Embrace technology and 12-tooth pulley wheels making it suitable for all cassettes as the distance stays optimum on each individual sprocket, regardless of the cassette selected. - Embrace technology not only keeps the rear derailleur vertically aligned in the perfect position for each sprocket, it now makes the upper pulley wheel advance perfectly in the direction the bike is advancing - On rough roads, the spring positioned between the upper body and the pivot absorbs the vibrations, ensuring the chain always rests properly on the sprockets - The pulley wheels on the 12-tooth derailleur cage allow the chain to move more smoothly - The initial position of the rear derailleur can be adjusted to suit any cassette. - The rear derailleur is positioned further back, making it easier to slide the wheel out and replace it - Upper and lower body crafted from technopolymer that is reinforced with long carbon fiber for exceptional durability Specifications: - Largest Cog: 34 - Rear Derailleur Mount Type: 10x1 Standard - Chain Wrap Capacity (teeth): 37 - Cage Length: Medium - Rear Der/Shifter Compatibility: Campy 12-Speed Chorus/Record/Super Record 2019+ - Drivetrain Speeds: 12 - Weight: 240g

The Campagnolo EKAR Rear Derailleur is designed for the 1x13-speed EKARndrivetrain with a gravel-orientated performance & build. - 2D parallelogram trajectory offers precise mechanical movement for 13 sprockets - High grade polymer pulley wheels (12T upper, 14T lower) allow for smooth chain running and secure retention - Carbon fiber-reinforced polyamide and anodized 7075 and 6082 alloys are lightweight, strong, and durable - Stainless steel bolts for strength and long-term resilience on gravel - Includes clutch lock for easy wheel removal Specifications: - Largest Cog: 44 - Rear Derailleur Mount Type: 10x1 Standard - Chain Wrap Capacity (teeth): 34 - Cage Length: Medium - Rear Der/Shifter Compatibility: Campy EKAR - Drivetrain Speeds: 13 - Weight: 275g

The Campagnolo Super Record EPS 12 speed rear derailleur offers improved shifting performance with a trajectory curve that is optimized for 11-29 and 11-32 cassettes. - Using 3D Embrace technology the inner mechanism embraces more teeth per sprocket thanks to the advanced position of the upper pulley - The 12-tooth pulley wheels allow for the integration of larger cassette range while keeping chain length the same - Upper body adjustments allow you to set the perfect position whether you're riding an 11-29 or 11-32 tooth cassette - An upper body return spring absorbs the energy of any bumps, preserving the hanger, and bringing the derailleur back to position - An aluminum upper body provides high resistance to impacts and greater stiffness - The lower part of the body is made of ultra-light technopolymer, reinforced with long carbon fibers Specifications: - Largest Cog: 32 - Rear Derailleur Mount Type: 10x1 Standard - Chain Wrap Capacity (teeth): 37 - Cage Length: Medium - Rear Der/Shifter Compatibility: Campy Record/Super Record EPS - Drivetrain Speeds: 12 - Weight: 234g

Improve the performance of your 12-Speed Shimano XT/XTR rear derailleur with pulleys that reduce friction and increase bearing life. Ours are designed to work with less drag, adding to the power transmitted to the rear wheel.

The CeramicSpeed Pulley Wheels for Shimano XT/XTR offers a unique symmetrical 14-tooth narrow-wide design that provides exceptional shift performance. The narrow-wide design delivers precise engagement of the chain, both on and off the pulley wheels. The increased pulley size, compared to stock, reduces chain friction. The pulleys have a lightweight machined alloy body for durability and long life, and are developed, designed and handbuilt in Denmark. In the box: Two 14-tooth pulley wheels CeramicSpeed Bearing Oil in 15ml dripper bottle Sticker sheet

The CeramicSpeed Pulley Wheels for Shimano XT/XTR odders a unique symetrical 14-tooth narrow-wide design that provides exceptional shift performance. The narrow-wide design delivers precise engagement of the chain, both on and off the pulley wheels. The increased pulley size, compared to stock, reduces chain friction. The pulleys have a lightweight machined alloy body for durability and long life, and are developed, designed and handbuilt in Denmark.

The OSPW X for SRAM Eagle Mechanical features a narrow wide tooth profile to ensure durable chain retention. The 14 tooth upper and 18 tooth lower pulleys reduces chain drag while the custom designed carbon fiber pulley cage ensures both durability and light weight. The SRAM Eagle specific OSPW System is developed and designed in Denmark and comes with a 4-6 years warranty period. In the box: A complete OSPW X system for SRAM Eagle Mechanical CeramicSpeed Bearing Oil in a 15 ml. dropper bottle

CeramicSpeed's OSPW RS for SRAM RED and Force AXS has been lifted with a distinctly modern and angular design. The updated design brings balance and refinement to the OSPW RS System allowing it to blend seamlessly into the contemporary design trends of bikes and groupsets - making up the whole of which the OSPW System is part. Innovative tech features of the OSPW RS meets consumer demands for a premium ride experience. The design for the OSPW RS isn't solely a visual update. The cage itself has been reinforced to offer new levels of strength and durability. The CeramicSpeed OSPW RS System continues the tradition of providing optimization and increased efficiency of the rear derailleur through its extremely low-friction bearings and unique overall design. Injection Molded Carbon Fiber reinforced PA cage offers new levels of strength and durability Anodized aluminum 5-spoke 15-tooth upper and 19-tooth lower pulley wheels are light weight and durable Grade 3 Silicon Nitride ball bearings are 400% smoother, 128% harder and 58% lighter than standard steel balls normally used in the bicycle industry 2 customizable spring tension settings for optimal setup Compatible with SRAM Red and SRAM Force AXS 12-speed rear derailleurs

CeramicSpeed Oversized Pulley Wheel System for Shimano Dura Ace 9200/Ultegra 8100 - Coated Races, Alloy Pulley, Carbon Cage, Gold The CeramicSpeed Oversized Pulley Wheel System provides optimization and increased efficiency of the rear derailleur through its extremely low-friction bearings and unique overall design. - Features 13-tooth upper and 19-tooth lower, aluminum pulley wheels with Grade 3 Silicon Nitride balls - Robust cage crafted from polyamide and carbon fiber for durability and light weight - Coated bearing races increase bearing service life by increasing hardness of race and reducing corrosion - Compatible with Dura Ace 9200 and Ultegra 8100 series (Fits 11-30 and 11-34 Shimano 12spd Cassette options) - Four spring tension settings allow customized setup based on ride conditions - Integrated stop tower for simple installation and durability Specifications: Largest Cog: 34 Fits Brand: Shimano Fits Model: Dura-Ace R9200 Series / Ultegra 8100 Series Drivetrain Speeds: 12

The Oversized Pulley Wheel System for SRAM Red and Force AXS features a 15-tooth upper and 19-tooth lower pulley wheel setting, for maximum efficiency. The handbuilt OSPW System has two spring tension settings, that allows customised setup based on riding conditions. This OSPW System is also compatible with the 2020 11 speed SRAM Red eTap derailleur featuring a clutch. Note; While there are visual similarities with the SRAM RED/Force AXS derailleurs, this OSPW system is not compatible with the SRAM Rival AXS, or SRAM RED, Force, or Rival XPLR eTap AXS rear derailleurs. Please see our Pulley Wheels for SRAM AXS Road In the box: Complete OSPW System for SRAM Red/Force AXS CeramicSpeed Pulley Oil, 15 ml. dropper bottle Custom tool for removal of stock cage and securing of OSPW System.

The CeramicSpeed Oversized Pulley Wheel System provides optimization and increased efficiency of the rear derailleur through its extremely low-friction bearings and unique overall design. Features a 14-tooth upper and 18-tooth lower, aluminum pulley wheels with Grade 3 Silicon Nitride balls to provide absolute optimization of the rear derailleur The narrow wide tooth profile ensures durable chain retention Robust cage is crafted from carbon reinforced polyamide for durability and light weight Three spring tension settings allow you to customize performance and reduce chain drag Fits 10-50 tooth cassette range Coated bearing races increase bearing service life by increasing hardness of race and reducing corrosion

The CeramicSpeed Oversized Pulley Wheel System provides optimization and increased efficiency of the rear derailleur through its extremely low-friction bearings and unique overall design. Features a 14-tooth upper and 18-tooth lower, aluminum pulley wheels with Grade 3 Silicon Nitride balls to provide absolute optimization of the rear derailleur Robust cage crafted from polyamide and carbon fiber for durability and light weight Compact cage design allows the use of the same length chain as stock pulleys Two spring tension settings allow customized setup based on ride conditions Only compatible with 1X specific derailleurs - XTR M9100-SGS/GS and Shimano XT M8100-SGS Coated bearing races increase bearing service life by increasing hardness of race and reducing corrosion

The CeramicSpeed Oversized Pulley Wheel System provides optimization and increased efficiency of the rear derailleur through its extremely low-friction bearings and unique overall design. Features 13-tooth upper and 19-tooth lower, aluminum pulley wheels with Grade 3 Silicon Nitride balls Robust cage crafted from polyamide and carbon fiber for durability and light weight Coated bearing races increase bearing service life by increasing hardness of race and reducing corrosion Two spring tension settings allow customized setup based on ride conditions Only compatible with SRAM Rival AXS 12-speed 36t cassette CeramicSpeed products with coated bearings include a lifetime warranty

This is an updated version of the Oversized Pulley Wheel System for Shimano 9100/9150 and 8000 SS/8050 SS. Mounting instructions for both this and the older version are to be found under our Support section. This new design has an integrated stop tower for easier mounting. The CeramicSpeed Oversized Pulley Wheels System has been proven to be the fastest pulley system in the world, providing energy savings starting from 2.4 watts over standard Shimano systems. The OSPW system for Shimano 9100/9150 and 8000 SS/8050 SS is an industry leading product, chosen by many of the world's leading cycling teams and professional triathlete's. Featuring a 13-tooth upper pulley wheel and a 19-tooth lower pulley wheel to provide absolute optimisation of the rear derailleur. The upper and lower oversized aluminium pulley wheels come fitted with either standard or coated CeramicSpeed Bearings. Please note: The OSPW System for 9100/9150 and 8000 SS/8050 SS is NOT compatible with Ultegra 8000-GS or 8050-GS (medium cage) derailleurs, nor with the clutch equipped Ultegra RD RX800 & RX805. Please see our OSPW X for Shimano RX800/805 for a compatible RX800 & RX805 version. For a compatible upgrade for Ultegra 8000-GS or 8050-GS please see our Pulley Wheels for Shimano, 11s NW. Please note while there is design similarities this OSPW is not compatible with the 12-speed Shimano 9200 or 8100 series derailleurs. The Shimano 9100/8000 OSPW system is compatible up to a 32 tooth cassette for both Dura Ace & Ultegra derailluers In The Box A complete 13-tooth/19-tooth OSPW System CeramicSpeed Bearing Oil in 15ml dropper bottle

CeramicSpeed's OSPW RS Alpha System for SRAM RED and Force AXS has been lifted with a distinctly modern and angular design. The updated design brings balance and refinement to the OSPW System allowing it to blend seamlessly into the contemporary design trends of bikes and groupsets - making up the whole of which the OSPW System is part. Innovative tech features of the OSPW RS Alpha meets consumer demands for a premium ride experience. The design for the OSPW RS Alpha isn't solely a visual update. The cage itself has been reinforced to offer new levels of strength and durability. The CeramicSpeed OSPW RS Alpha System continues the tradition of providing optimization and increased efficiency of the rear derailleur through its extremely low-friction bearings and unique overall design. - Injection Molded Carbon Fiber reinforced PA cage offers new levels of strength and durability - Alpha disc pulleys are paired with a composite, narrow-wide tooth profile to help prevent debris from external objects getting stuck between the spokes - The 15-tooth upper and 19-tooth lower Alpha pulley wheels feature ADR bearing protection that completely encloses the bearings - Grade 3 Silicon Nitride ball bearings are 400% smoother, 128% harder and 58% lighter than standard steel balls normally used in the bicycle industry 2 customizable spring tension settings for optimal setup - Compatible with SRAM Red and SRAM Force AXS 12-speed rear derailleurs

The CeramicSpeed Oversized Pulley Wheel System provides optimization and increased efficiency of the rear derailleur through its extremely low-friction bearings and unique overall design. - Features 15-tooth upper and 19-tooth lower, titanium pulley wheels with Grade 3 Silicon Nitride balls - Titanium pulley wheels are 3D-printed and hollow for additional weight savings and durability - Robust cage crafted from polyamide and carbon fiber for durability and lightweight - Two spring tension settings allow customized setup based on ride conditions - Fits cassettes from 10 to 36-tooth - Coated bearing races increase bearing service life by increasing hardness of race and reducing corrosion - Compatible with SRAM Red AXS, SRAM Force AXS and 2020 SRAM Red eTap 11 speed derailleur with the orbit clutch. This system is also compatible with the wider range Force AXS medium cage derailleur - CeramicSpeed products with coated bearings include a lifetime warranty

The CeramicSpeed Oversized Pulley Wheel System provides optimization and increased efficiency of the rear derailleur through its extremely low-friction bearings and unique overall design. Features 15-tooth upper and 19-tooth lower, titanium pulley wheels with Grade 3 Silicon Nitride balls Titanium pulley wheels are 3D-printed and hollow for additional weight savings and durability Robust cage crafted from polyamide and carbon fiber for durability and light weight Two spring tension settings allow customized setup based on ride conditions Fits cassettes from 10 to 36-tooth Coated bearing races increase bearing service life by incre

Product Type: Rear derailleur hanger Aluminum Type: Aircraft grade 6061 Cast Type: CNC Finish: Black anodized Includes Hardware: Yes Screw Bolt: M8 Chainring Bolt

- Offers the lowest friction possible while maintaining shift accuracy - Includes pulleys with ceramic balls and steel races - Long tooth profile on lower pulley for best chain retention - Chain catcher on lower pulley to prevent chain jams - Ride it on-road and off-road without restriction - Shimano R9250/R8150 Di2 - Road Seals

Kogel Oversized Kolossos Derailleur Pulley Sram eTap Red/Force Sram eTap version fits 12 speed Sram Red and Force Etap AXS derailleurs Also compatible with (post Sep. 2020) Red eTap A2 11sp derailleurs with the Hydro Clutch, NOT compatible with the original (pre Sep 2020) 11 speed etap derailleur Besides reduced friction, this cage is built with shifting accuracy, gravel worthiness and chain retention in mind Long tooth profile on lower pulley offers best possible chain retention Lower pulley assembly features a chain catcher to prevent jams Can be used dependably on or off road Oversized 14 and 19 tooth Kogel pulleys SPECIFICATIONS Model: Sram eTap AXS Road Seals Size: 14/19T

M21 rear derailleurs are designed to work with 6- and 7-speed Shimano road and mountain shifters. Enjoy the wide variety of bikes you can get going again with M21 rear derailleurs. - Robust composite and steel construction - Compatible with Shimano 6- and 7-speed mountain and road systems

M21 rear derailleurs are designed to work with 6- and 7-speed Shimano road and mountain shifters. Enjoy the wide variety of bikes you can get going again with M21 rear derailleurs. - Robust composite and steel construction - Compatible with Shimano 6- and 7-speed mountain and road systems - Long cage for double or triple cranksets and 32T max cassette cog - Includes frame hanger attachment for use with older frame designs

R-series rear derailleurs are designed to work with 8 and 9-speed Shimano-compatible road shifters. These R8 rear derailleurs have composite and steel parts that weigh more but have the same durability and performance as R9 and R10 derailleurs. - Steel pulley cage for extra durability - Not compatible with Shimano Tiagra 4700 road system - Short cage for double crankset and 28T max cog - Long cage for triple crankset and 28T max cog

M-series rear derailleurs are designed to work with 7, 8, and 9-speed Shimano-compatible mountain and road shifters. Marvo LT rear derailleurs are built with precision rigid aluminum construction. Let these miracle workers get any bike rolling again. - Lightweight aluminum construction - Steel pulley cage for extra chain-rub durability - Compatible with Shimano 7, 8, and 9-speed mountain and road systems

XLE Rear Derailleur for 10-speed Shimano drivetrains - For MEGA Sprockets w/large cog size 36-42T - Compatible with single, double, or triple cranksets - Total Capacity: 47T

The microSHIFT Sword rear derailleur for 1x system features a modern and innovative design with elegant mechanical operation. The cage is designed to use with a single chainring and an 11-48t cassette, giving you a wide range and excellent climbing gears. Not only that, but the cage itself is replaceable, so you can repair a damaged cage or even switch to the 2x cage easily. It also features a hidden clutch design with instant engagement and silent operation to keep the chain secure over rough terrain. With the introduction of Igus bushings on the parallelogram, lateral stiffness and longevity are both improved, making shifting snappier and more robust. Even the barrel adjuster is innovative, with an orbital housing stop that rotates by 15 degrees to reduce cable friction from tight housing bends. - Compatible with Sword and Advent X shifters - Compatible with standard 10-speed chains - Silent clutch with instant engagement and integrated switch - Igus bushings for added stiffness - Replaceable cage - Max cassette range of 48t - Orbital barrel adjuster reduces housing bends for less cable friction

The microSHIFT Sword rear derailleur for 2x system features a modern and innovative design with elegant mechanical operation. The cage is designed to use with a double chainring and an 11-38t cassette, giving you a very wide range with excellent climbing gears. Not only that, but the cage itself is replaceable, so you can repair a damaged cage or even switch to the 1x cage easily. It also features a hidden clutch design with instant engagement and silent operation to keep the chain secure over rough terrain. With the introduction of Igus bushings on the parallelogram, lateral stiffness and longevity are both improved, making shifting snappier and more robust. Even the barrel adjuster is innovative, with an orbital housing stop that rotates by 15 degrees to reduce cable friction from tight housing bends. - Compatible with Sword and Advent X shifters - Compatible with standard 10-speed chains - Silent clutch with instant engagement and integrated switch - Igus bushings for added stiffness - Replaceable cage - Max cassette range of 38t - Orbital barrel adjuster reduces housing bends for less cable friction

Replacement pulley set with ceramic bearings. Compatible with 7,8,9, and 10-speed Campagnolo, Shimano, and SRAM drivetrains.

Paul Components Melvin Chain Tensioner. Converts frames for single speed use. Long enough for a Dingle-setup, (2 rings, one cog) 20T max. - The Melvin uses two pulleys, just like a rear derailleur, which gives it 20 teeth of chain wrap - Will work with multiple front chain rings while maintaining proper chain tension - The pulleys are made of extruded and machined aluminum and have sealed bearings for durability - Pulleys are 2.25mm thick at the tooth which fits inside most narrow 6 through 9 speed chains, and the pulley cage is wide enough to allow 1/8? single speed chains as well - Long enough for a Dingle-setup, (2 rings, one cog) 20T max - Do not use with a coaster brake or fixed gear - Includes Paul's own Sealed Bearing Pulleys