Quick Look: CeramicSpeed’s New System

CeramicSpeed’s new system uses bigger pulleys to minimize friction for watt savings.

CeramicSpeed Oversized Pulley Wheel System

$500–$600, Ceramicspeed.com

Larger pulley wheels reduce the amount of friction in the chain by minimizing sharp curves and the twists that the chain has to make. The use of top-grade pulley bearings further reduces friction (independent lab tests from Friction Facts in Boulder, Colo., show about 3 watts of average savings).

• The system is compatible with all (mechanical and Di2) Shimano Ultegra and Dura-Ace 10- and 11-speed derailleurs.
• The pulley cage is made out of carbon fiber to maximize stiffness, lower the weight and even to allow for an airfoil shape in the cage.
• The carbon cage and hollow minimalist alloy pulleys mean the system stays light at 56 grams.
• CeramicSpeed offers an optional ultra-thin 2 micron thick coating on the races of its high-grade pulley bearings that is designed to optimize performance and maximize durability for an additional $100.
• Oversized alloy pulleys with 17 teeth are substantially bigger than the standard 11-tooth pulleys found on many derailleurs. The idea is that bigger pulleys force less bend in every link, so there is less tension (and therefore friction) on the chain.

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