Go big, drag less with CeramicSpeed's huge pulleys

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

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.

Nathan Haas raced the new OSPW System to fourth at Amstel Gold
Nathan Haas raced the new OSPW System to fourth at Amstel Gold

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. 

CermaicSpeed's new 13/19t pulley for Shimano Dura-Ace 9100 and 9150 derailleurs
CermaicSpeed's new 13/19t pulley for Shimano Dura-Ace 9100 and 9150 derailleurs

Ben Delaney

US Editor-in-Chief
Ben has been writing about bikes since 2000, covering everything from the Tour de France to Asian manufacturing to kids' bikes. The former editor-in-chief of VeloNews, he began racing in college while getting a journalism degree at the University of New Mexico. Based in the cycling-crazed city of Boulder, Colorado, with his wife and two kids, Ben enjoys riding most every day.
  • Discipline: Road (paved or otherwise), cyclocross and sometimes mountain. His tri-curious phase seems to have passed, thankfully
  • Preferred Terrain: Quiet mountain roads leading to places unknown
  • Current Bikes: Scott Foil Team Issue, Specialized S-Works Tarmac, Priority Eight city bike... and a constant rotation of test bikes
  • Dream Bike: A BMC Teammachine SLR01 with disc brakes and clearance for 30mm tires (doesn't yet exist)
  • Beer of Choice: Saison Dupont
  • Location: Boulder, CO, USA

Related Articles

Back to top