Go big, drag less with CeramicSpeed's huge pulleys

Oct 26, 2023

CeramicSpeed offers new 13/19t system for latest Dura-Ace derailleur

By Ben Delaney

Published: April 27, 2017 at 12:00 am

You may have seen conspicuously large derailleur pulleys at use in WorldTour races or elite-level triathlons. CeramicSpeed is one of the companies making such pulley systems — which reduce mechanical drag slightly by opening chain-wrap angles — and now the company has a 13/19t system for the latest Shimano Dura-Ace derailleurs.

CeramicSpeed's Oversized Pulley Wheel System (OSPW System) for the new Dura-Ace 9100 mechanical and 9150 Di2 derailleurs can fit cassettes of up to 32t.

CeramicSpeed's other OSPW options for Shimano and SRAM derailleurs use dual 17t pulleys (modern derailleurs typically use 11t pulleys), but the new Shimano derailleurs don't allow for an upper pulley wheel larger than 13t. So, CeramicSpeed opted to enlarge the lower pulley way up to 19t.

CeramicSpeed claims that the new Shimano OSPW System reduces friction by 30 percent, compared to stock Shimano pulleys. In addition to opening the chain-wrap angles, the OSPW System uses ceramic bearings, which roll more smoothly than standard steel bearings.

Dimension Data rider Nathan Haas recently took fourth at the Amstel Gold Race on the CeramicSpeed OSPW System for Shimano 9100.

The system is selling now for $499, and will begin shipping May 9.

Contributor

Ben Delaney is a journalist with more than two decades of experience writing for and editing some of the biggest publications in cycling. Having studied journalism at the University of New Mexico, Ben has worked for Bicycle Retailer & Industry News, VeloNews and BikeRadar. He has also previously worked as Global Brand Communications Manager for Specialized. Ben covers all things road and gravel, and can be found logging big miles in the Rocky Mountains that nestle alongside his home in Boulder, Colorado. He has covered the most important bike races in the sport, from the Tour de France and Tour of Flanders, to the Unbound gravel race, and specialises in tech content, showcasing what the pros are riding and putting everyday equipment through its paces.

Order the Official Tour De France Race Guide 2023

Only £10.99 including FREE UK delivery

Subscribe to MBUK and get a Nukeproof Sam Hill Enduro Saddle Oil Slick as your welcome reward! Plus, save 30% off the shop price!