Entirely developed, designed, and produced in Denmark by CeramicSpeed, the Oversized Pulley Wheel System for SRAM eTap is a huge technological advance for the cycling industry. Matching the highest quality materials with a unique design, the OSPW System delivers lower friction and longer lifetime, improving your competitive advantage. Thanks to the OSPW System for SRAM eTap, the power savings over OEM pulleys start at 40%, and the CeramicSpeed Bearings inside guarantee 3-5 times greater longevity compared to commonly used standard pulleys on the market. The watt savings with a CeramicSpeed OSPW System for SRAM eTap start at 1.6 watts. The OSPW system for SRAM eTap derailleurs is compatible with up to a 32-tooth cassette size and with both short cage & WiFli derailleur bodies. The product is for 11-speed eTap and is not compatible with 12-speed SRAM eTap AXS. If you have the updated 11-speed SRAM eTap derailleur featuring the orbit clutch, you will need the CeramicSpeed OSPW System for SRAM eTap AXS derailleurs. - The overall power savings of the OSPW System for SRAM eTap commonly reach 40%-60% over a stock setup. - The oversized pulley wheels have a lifespan that is 3-5 times longer than the commonly used standard pulleys on the market. - The OSPW system for SRAM eTap derailleurs is compatible with up to a 32-tooth cassette size and with both short cage & WiFli derailleur bodies. The product is for 11-speed eTap and is not compatible with 12 speed SRAM eTap AXS. - This 3D-printed titanium version of the OSPW System comes with our CeramicSpeed Coated Bearings for even longer service life and lower friction. In The Box: - Oversized Pulley Wheel System - CeramicSpeed Bearing Oil in 15 ml dropper bottle - Sticker sheet - IMPORTANT: When traveling, please remember to dismount your entire rear derailleur with an Allen key, as the OSPW System will not fit safely in most bike travel bags and could be damaged if left on.

The absoluteBLACK's HOLLOWcage® Oversized Derailleur Pulley Cage for Shimano 9100 / 8000 features a revolutionary mono-plate design to provide quiet and precise shifting. - Designed for use with Shimano Dura Ace 9100 / 9150 / 9170 , and Ultegra 8000 / 8050 - Fits up to a 32T cassette - The Silent Xring Pulley dampens the chain impact on the guide pulley teeth, eliminating the engagement noise -Flexible cage design aligns better with the angle of the chain when using the higher gears of the cassette - HOLLOWcage uses abnormally large, bespoke, full ceramic bearings that make the pulleys incredibly stiff for greater shifting precision - Upper pulley features tall teeth to provide improved shifting precision

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 offer you customized setup based on riding conditions. This OSPW System is also compatible with the 2020 11-speed SRAM Red eTap derailleurs featuring a clutch. - Pulley wheels: CeramicSpeed 15-tooth upper and 19-tooth lower - Pulley wheel material: aluminum - Cage material: carbon-reinforced PA - Bearing options: CeramicSpeed Standard or Coated - Compatibility: SRAM Red AXS and SRAM Force AXS. 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 - Cassette Compatibility: Fits 12-speed 10-36 tooth cassettes. Fits 11-32 tooth cassettes when used with an 11-speed clutched derailleur - Spring Tension Settings: 2-spring - Speeds: 12-speed - Discipline: Road and Gravel/Cross - Custom tool included for removal of stock cage and securing of OSPW. The factory clutch mechanism will remain intact. There is no damage or modification to the clutch for the installation of the OSPW System 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 OSPW X for SRAM Eagle AXS features a narrow wide tooth profile to ensure durable chain retention. The 14-tooth upper and 18-tooth lower pulleys reduce chain drag, while the custom-designed carbon fiber pulley cage ensures both durability and light weight. - Pulley Wheels: CeramicSpeed 14-tooth upper and 18-tooth lower - Pulley Wheel Material: aluminum - Cage Material: Carbon-reinforced PA - Bearing Options: CeramicSpeed Standard or Coated - CeramicSpeed Grease/Oil: Pulley Oil - Compatibility: SRAM Eagle AXS (Electronic) - Compatibility Cassette: 10-52 tooth max - Spring Tension Settings: 3 - Speed: 12-speed - Discipline: Off-road and Gravity In the box: - A complete OSPW X System for SRAM Eagle AXS - CeramicSpeed Bearing Oil in a 15ml dropper bottle

The fastest oversized pulley wheel system in the world is also available for SRAM Rival & Force 1 Type 3 derailleurs. Featuring 14-tooth (upper) and 18-tooth (lower) pulleys with a narrow-wide profile, the OSPW X System for SRAM Rival & Force 1 Type 3 is available fitted with CeramicSpeed standard or coated bearings, with up to a 6-year warranty. The unique narrow-wide tooth profile of the pulleys ensures durable chain retention. The system is fitted with a custom-designed, strong carbon fiber pulley cage assembly for outstanding durability and light weight. The cage design allows you to choose between two spring tension settings to customize performance and reduce chain drag. We recommend initial setup in the lower spring tension. This has been designed to leave the clutch mechanism fully functional for chain retention. In the event that the low spring tension does not provide adequate shift quality on very rough roads, you can increase it to the high-spring tension, which corresponds to the factory settings. Thanks to the high-quality CeramicSpeed Bearings inside, your product will benefit from a 3-5 times longer lifespan than stock, and it has been tested to deliver 30-40% less friction than conventional systems. This product is completely developed and handbuilt in Denmark, including the top quality CeramicSpeed Bearings inside. The OSPW X System for SRAM Rival & Force 1 Type 3 is compatible with SRAM Rival or Force 1X 11-speed with Type 3 clutch, regardless of the cage length. Note that the cage lock must be in the 8 o'clock position, not the 5 o'clock position. This product is NOT compatible with Type 2.1 clutch derailleurs. In The Box: - A complete 14-tooth/18-tooth OSPW X System for SRAM 1x - CeramicSpeed bearing oil in 15ml dropper bottle - Sticker Sheet

Entirely developed, designed, and produced in Denmark by CeramicSpeed, the Oversized Pulley Wheel System for SRAM eTap is a technological advance for the cycling industry. Matching the highest quality materials with a unique design, the OSPW System delivers lower friction and longer lifetime, improving your competitive advantage. Thanks to the OSPW System for SRAM eTap, the power savings start at 40%, and the CeramicSpeed Bearings inside offers a 3-5 times longer lifespan compared to standard pulleys on the market. The watt savings with a CeramicSpeed OSPW System for SRAM eTap start at 1.6 watts. This 17/17-tooth OSPW system for SRAM eTap derailleurs is compatible with up to a 32 tooth cassette and with both short cage & WiFli derailleur bodies. The product is for 11-speed eTap and is not compatible with 12-speed SRAM eTap AXS. If you have the updated 11-speed SRAM eTap derailleur featuring the orbit clutch, you will need the CeramicSpeed OSPW System for SRAM eTap AXS derailleurs. The typical overall power savings of the OSPW System for OSPW System for SRAM eTap is 40%-60% over a stock setup. The oversized pulley wheels have lifespan that is 3-5 times longer than the commonly used standard pulleys on the market. In The Box: - Oversized Pulley Wheel System - CeramicSpeed Bearing Oil in 15ml dropper bottle - Sticker Sheet

This is an updated version of the Oversized Pulley Wheel System for Shimano 9100/9150 and 8000 SS/8050 SS. 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 at 2.4 watts compared to 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 triathletes. It features a 13-tooth upper pulley wheel and a 19-tooth lower to provide absolute optimization of the rear derailleur, and these oversized aluminum pulley wheels come fitted with either standard or coated CeramicSpeed Bearings: your choice. The Shimano 9100/8000 OSPW system is compatible up to a 32 tooth cassette for both Dura Ace & Ultegra derailleurs The typical overall power savings of the OSPW System for Shimano 9100/9150/8000 is 30%-60% over a stock setup. The oversized pulley wheels have lifespan that is 3-5 times longer than the commonly used standard pulleys on the market. 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. Choose CeramicSpeed's OSPW X for Shimano RX800/805 for a compatible RX800 & RX805 version. For a compatible upgrade for Ultegra 8000-GS or 8050-GS choose their Pulley Wheels for Shimano, 11s NW. In The Box: - A complete 13-tooth/19-tooth OSPW System - CeramicSpeed Bearing Oil in 15ml dropper bottle

Improve the performance of your 11-speed Shimano 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. Our Titanium Pulley Wheels for Shimano 11s are available with CeramicSpeed Coated Bearings that add an extra layer to the performance of the product. The Coated Bearings have races 75% harder than our hardened-steel races. They last 60% longer than our Standard Bearings. Bearing drag is decreased by over 50% compared to our Standard Bearings. Both our Standard and Coated come with the same super-hard, super-round CeramicSpeed Balls. Designed in light and strong machined Titanium, these Pulley Wheels offer three times the lifespan of our alloy Pulley Wheels, and are compatible with all 11-speed Shimano derailleurs. - There is both an upper and lower-specific pulley in the set. They are marked accordingly and have directional arrows, as well. - These pulleys are compatible with all Shimano 11-speed rear derailleurs, both mechanical and electronic. - The kits come with CeramicSpeed oil in a 15ml dropper bottle, and the bearings come pre-oiled. In the box: - 2 x 11-tooth pulley wheels - 4 x spacers - CeramicSpeed Bearing Oil in 15 ml dropper bottle - Sticker sheet

The OSPW X System for Shimano XT/XTR 1x12 reduces friction by 35-40% compared to stock pulley configurations. The lightweight, custom-molded carbon fiber cage ensures durability. This design allows the use of the same length chain as stock pulleys. The 14-tooth upper and 18-tooth lower pulley profiles ensure stable chain retention while reducing drag. The OSPW X System is developed, designed, and handbuilt in Denmark—and proven globally. Only compatible with 1X specific derailleurs. - Pulley Wheels: CeramicSpeed 14-tooth upper and 18-tooth lower - Pulley Wheel Material: aluminum - Cage Material: Carbon-reinforced PA - Bearing Options: CeramicSpeed Standard or Coated - CeramicSpeed Grease/oil: CeramicSpeed Pulley Oil - Compatibility: Shimano XTR M9100-SGS, Shimano XTR M9100-GS, Shimano XT M8100-SGS and SLX M-7100 derailleurs - Cassette Compatibility: Up to a 10-51 tooth range - Spring Tension Settings: 2 spring tension settings - Speed: 12-speed - Discipline: Off-Road In the box: - Complete OSPW System for Shimano XT/XTR 1x12 - CeramicSpeed Pulley Oil, 15 ml - Sticker Sheet

Developed and designed entirely by CeramicSpeed, the Oversized Pulley Wheel System for Campagnolo is advanced for the optimization of bike performance. Everything from bearings to the cage is made from the highest quality materials. The oversized aluminum pulley wheels are fitted with standard or coated CeramicSpeed Bearings, which reduce friction to the minimum. The 13-tooth/19-tooth OSPW for Campagnolo provides 40% lower friction over a standard 11-tooth Campagnolo pulley wheel and fits up to a 32-tooth cassette. The OSPW for Campagnolo is compatible with all Campagnolo electronic rear derailleur (EPS) and all rear derailleurs with a mounting sleeve—no matter the age and model. At this point, this OSPW System is not compatible with the Campagnolo 12-speed Record and Super Record derailleurs. The OSPW for Campagnolo is compatible with: - Record mechanical - Record EPS - Super Record mechanical - Super Record EPS - Potenza mechanical - Chorus Please note, some models of Campagnolo rear derailleur, including all EPS models, do not feature a B-limit adjustment. While this product is still compatible with those derailleurs, it may not be possible to fit a 32 tooth cassette successfully on some bikes. When travelling, please remember to dismount your entire rear derailleur with an Allen key, as the OSPW System will not safely fit in most bike travel bags and could be damaged if left on. In The Box: - Oversized Pulley Wheel System - CeramicSpeed Bearing Oil in 15ml dropper bottle - Sticker sheet

Developed and designed entirely by CeramicSpeed, the Oversized Pulley Wheel (OSPW) System for Shimano 9000/6800 provides the ultimate optimization of your bicycle's drivetrain. This OSPW System features a set of 17-tooth aluminum Pulley Wheels housed in a specially designed polyamide (PA) and carbon cage. The upper and lower 17-tooth oversized aluminum pulley wheels come fitted with either standard or coated CeramicSpeed Bearings. The Oversized Pulley Wheel (OSPW) System is the product of choice by many of the world's leading cycling teams and triathletes. This specific system is compatible with Ultegra 6700/6770/6800/6870 mechanical and Di2 rear derailleurs and Dura Ace 7900/7970/9000/9070 mechanical and Di2 rear derailleurs. It is not compatible with Shimano Dura-Ace 9100/9150 and Ultegra 8000 series rear derailleurs. For those rear derailleurs you will need a OSPW System for Shimano 9100 series. The system is compatible with up to a 28-tooth cassette on most bikes, depending on derailleur hanger. The typical overall power savings of the OSPW System for Shimano 9000/6800 is 30%-60% over a stock setup, and the oversized pulley wheels have a lifespan that is 3-5 times longer than the commonly used standard pulleys on the market. In The Box: - A complete 17-tooth OSPW System - CeramicSpeed bearing oil in 15ml dropper bottle

SRAM's 1x Eagle component system boasts a twelve-speed cassette. We built pulleys that can handle the load better than stock. These CeramicSpeed Pulley Wheels work with less drag, adding to the power transmitted to the rear wheel while offering greater durability, going longer between replacement intervals. These pulleys are also fully compatible with the SRAM Eagle AXS derailleur. The aluminum pulleys with standard bearings are 34.4% more efficient than stock and use our low-drag, long-life Standard Bearing with hardened-steel races and our super-round CeramicSpeed balls. The upper and lower pulleys both have a narrow-wide tooth design with 14 teeth each. As the upper and lower pulleys have different tasks, they have different shapes. You'll find they are thus marked, and have directional arrows. These pulleys should be installed with stock SRAM pulley spacers. Save those from your old pulleys before installing CeramicSpeed. The kits come with CeramicSpeed Oil in a 15ml dropper bottle and grease in 5ml syringe. The bearings come pre-oiled. The grease can be used on the pulley bearings when riding in particularly harsh environments. In the box: - 2 x 14-tooth pulley wheels - CeramicSpeed Bearing Oil in 15ml dropper bottle - CeramicSpeed Grease in 5ml syringe - Sticker sheet

Replacement Pulley Wheels for the CeramicSpeed OSPW System. Includes 2 pulley wheels. - Precision-machined aluminum pulleys - For use with CeramicSpeed's Oversized Pulley Wheel System only - Coated races increase bearing service life by increasing hardness of race and reducing corrosion - CeramicSpeed products with coated bearings include a 6-year warranty

- Includes 61803 (1) and 61903 (1) bearings and one grease syringe - Measurable wattage savings between 1.5 and 9 watts per bearing set, depending on the level and condition of your existing bearings - Note: 88 front and 188v9 rear hubs are on all 2014 and newer Zipp 202, 303, 404, 808 - One kit required for: Zipp Super-9, 900 tubular and Sub-9 disc rear hubs

- Includes 61903 bearings and one grease syringe - Measurable wattage savings between 1.5 and 9 watts per bearing set, depending on the level and condition of your existing bearings

- Includes 61803 bearings and one grease syringe - Measurable wattage savings between 1.5 and 9 watts per bearing set, depending on the level and condition of your existing bearings - These 61803 bearings are not interchangable with the 88/188 hub 61803 bearings

Improve the performance of your 11-speed Shimano 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. - Uses low-drag, long-life Standard Bearing with hardened-steel races and our super-round CeramicSpeed balls. - A set consists of differing upper and lower pulleys: they are marked as such and have directional arrows etched on them so you know exactly how to install them. - These pulleys are compatible with all Shimano 11-speed rear derailleurs except XT or XTR. - The kits come with CeramicSpeed oil in a 15ml dropper bottle. The bearings come pre-oiled. In the box: - 2 x 11-tooth pulley wheels - 4 x spacers - CeramicSpeed Bearing Oil in 15 ml dropper bottle - Sticker sheet

The VukaClip is all about providing the ultimate in fit, security, and adjustability for you to be faster and more efficient in your triathlon or time-trial aero position at an affordable price. Redesigned to be easier to set up and adjust, the VukaClip has a large, redesigned armrest to reduce pressure points and increase comfort. The VukaClip is made with the industry-standard 22.2mm clamp diameter for maximum versatility, making it compatible with most extensions on the market. Designed with input from top bike fitters, the shape of the Vuka Evo Extensions are crafted to feel as if the rider is shaking hands with the bar. This is achieved through the use of a multi-radius bend paired with a 20mm inward roll of the bar that can be adjusted to dial in fit and achieve an ideal position. - Bar-setting fit, security, and adjustability - Extension material: Unidirectional carbon

The VukaClip is all about providing the ultimate in fit, security, and adjustability for you to be faster and more efficient in your triathlon or time-trial aero position at an affordable price. Redesigned to be easier to set up and adjust, the VukaClip has a large, redesigned armrest to reduce pressure points and increase comfort. The VukaClip is made with the industry-standard 22.2mm clamp diameter for maximum versatility, making it compatible with most extensions on the market. Vuka Race Extensions feature 52mm of rise along with a bend that places the wrists at a more natural bend to help riders remain in their tuck to optimize aerodynamics. - Bar-setting fit, security, and adjustability - Extension material: Unidirectional carbon

- Lightweight, durable alloy clamp system designed specifically to work with the Contact SLR Aero Integrated or Contact SLR Aero handlebars for 2018+ Propel Advanced Disc and 2019+ Propel Advanced - Quick easy one bolt setup adjustment and wide-range armrest positioning - Fits Giant Contact SL/Connect SL bar extensions (22.2mm) - Armrest pads included

Giant's Connect SL U-Bend Carbon Aerobar Extension is for use with Giant's Clip-On Aerobar Clamps (sold separately). This model features the U-Bend. Thanks to carbon construction, this is a featherweight and super-stiff bar. Plus, it has 70mm of fore/aft adjustment to dial in your ideal aero position.

The 35c+ extensions offer a slightly higher rise then the orginal T4c and are half the weight - saving 12g in their uncut form. The new range of extensions have evolved from our well proven T-Series. They have been designed to offer distinct fit options. We have also adopted a new naming system whereby the name gives the angle material of the extension. Thus 35c+ is a 35° bend in aluminium. Performance: The sole purpose of extensions is to provide a comfortable position for the rider's hands relative to the armrests. They enhance performance by allowing the rider to relax into their optimal position, which is why we provide different fit options so each rider can chase their best performance. Fit Data: - Extension Shape: A 35 degree ski-bend extension suited to riders who prefer to adopt a wrist angle that is on the low side of the neutral range. - The 35c+ is a straight 35° bend. - Length: 400mm - Outer Diameter: 22.2mm - Inner Diameter: 19.4mm - Construction: Carbon - Weight: 142g/pair Tech Guide: - All the extensions have a 22.2mm diameter in the clamping area. - They are designed for cables to be routed out the rear of the extensions so do not have cable exit holes. Who is it for? The extensions will fit in any aerobar that is designed for 22.2mm. So can be used by any rider wishing to improve the comfort of their aerobar grips.

Three-Speed Sturmey Archer Coaster Brake Trike Conversion Kit - 21T Front Drive Cog - 22T Rear Transfer Cog - 24T Axle Drive Cog - Cable stop required when installing on Sun Atlas Industrial Cargo Trike

All CeramicSpeed Bearings are hand-built in Denmark. Super-smooth CeramicSpeed grade 3 Silicone Nitride balls are matched (within microns) with hardened steel raceways that feature an ultra-smooth polished groove. The balls are held in place by a reinforced polyamide cage. Every bearing is optimized with a low-viscosity CeramicSpeed All Round Grease to minimize friction and increase bearing life. Non-contact seals complete the bearings, keeping dirt and moisture out. CeramicSpeed Bearings can be used for any cycling discipline: Road, TT, Tri, Track, Cross, and MTB. The benefits are super low friction, better power transfer, and increased bearing life. During the building process, we check each bearing four times by hand to ensure that all parts are matched perfectly. CeramicSpeed Balls are 400% smoother, 128% harder, and 58% lighter than standard steel bearings normally used in the bicycle industry. When comparing the CeramicSpeed Balls with other ceramic balls in the industry, you will find that the CeramicSpeed Balls are 15% harder, take 99% higher loads, and are 100% smoother. - Inner Diameter: 17mm - Outer Diameter: 30mm - Width: 7mm

Campagnolo's Record EPS V2 Interface Unit is like a translator, the vital piece of the electronic shifting puzzle. Mounted to the brake cable or the handlebar, it processes the data churned out by the EPS Power Unit (sold separately) and communicates it to you via an easy-to-read colored LED. Plus, it plays the critical role of converting every analog shift you send its way into a digital format so the system can work as a cohesive whole. There's also an easy-to-read LED battery gauge so you know when it's time to recharge the system. And don't mind the weather, as it's totally waterproof.

- Compatible with Contact SLR Aero handlebar

The new range of extensions have evolved from our well proven T-Series. They have been designed to offer distinct fit options. We have also adopted a new naming system whereby the name gives the angle material of the extension. Thus 50c is a 50° bend in carbon. Performance - The sole purpose of extensions is to provide a comfortable position for the riders hands relative to the armrests. They enhance performance by allowing the rider to relax into their optimal position. Which is why we provide different fit options so each rider can chase their best performance. Fit Data - Extension Shape: A 50c extensions offer a 50° ski bend shape. - The 50c offer a 7.5mm lateral shift per side. This allows the rider to get their hands narrower or wider without tilting the extensions so much that the shifters touch. Origin - Recent trends in aerobar fit have been towards higher hand positions, so we've increased the rise compared to previous generation extensions. We have focused on the most popular angles from our previous range and added the 50c as a multi position option. Tech Guide - All the extensions have a 22.2mm diameter in the clamping area. - They are designed for cables to be routed out the rear of the extensions so they do not have cable exit holes. Who is it for? - The extensions will fit in any aerobar that is designed for 22.2mm. So can be used by any rider wishing to improve the comfort of their aerobar grips. - Length: 400mm - Outer Diameter: 22.2mm - Construction: Carbon - Weight: 268g/pair

All CeramicSpeed Bearings are hand-built in Denmark. Super-smooth CeramicSpeed grade 3 Silicone Nitride balls are matched (within microns) with hardened steel raceways that feature an ultra-smooth polished groove. The balls are held in place by a reinforced polyamide cage. Every bearing is optimized with a low-viscosity CeramicSpeed All Round Grease to minimize friction and increase bearing life. Non-contact seals complete the bearings, keeping dirt and moisture out. CeramicSpeed Bearings can be used for any cycling discipline: Road, TT, Tri, Track, Cross, and MTB. The benefits are super low friction, better power transfer, and increased bearing life. During the building process, we check each bearing four times by hand to ensure that all parts are matched perfectly. CeramicSpeed Balls are 400% smoother, 128% harder, and 58% lighter than standard steel bearings normally used in the bicycle industry. When comparing the CeramicSpeed Balls with other ceramic balls in the industry, you will find that the CeramicSpeed Balls are 15% harder, take 99% higher loads, and are 100% smoother. - Inner Diameter: 17mm - Outer Diameter: 26mm - Width: 5mm

- Compatible with 31.8mm round handlebars - Adjustable armrest adapts to a wide range position - Includes 20mm, 40mm, and 60mm spacers - Fits Giant Contact SL/Connect SL bar extensions (22.2mm)

All CeramicSpeed Bearings are hand-built in Denmark. Super-smooth CeramicSpeed grade 3 Silicone Nitride balls are matched (within microns) with hardened steel raceways that feature an ultra-smooth polished groove. The balls are held in place by a reinforced polyamide cage. Every bearing is optimized with a low-viscosity CeramicSpeed All Round Grease to minimize friction and increase bearing life. Non-contact seals complete the bearings, keeping dirt and moisture out. CeramicSpeed Bearings can be used for any cycling discipline: Road, TT, Tri, Track, Cross, and MTB. The benefits are super low friction, better power transfer, and increased bearing life. During the building process, we check each bearing four times by hand to ensure that all parts are matched perfectly. CeramicSpeed Balls are 400% smoother, 128% harder, and 58% lighter than standard steel bearings normally used in the bicycle industry. When comparing the CeramicSpeed Balls with other ceramic balls in the industry, you will find that the CeramicSpeed Balls are 15% harder, take 99% higher loads, and are 100% smoother. - Inner Diameter: 30mm - Outer Diameter: 42mm - Width: 7mm