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Ceramic Speed's new 17 tooth Oversized Pulley Wheel System (OPWS) offers between 2.4 and 6 watts of claimed power savings over conventional pulley systems, with only a tiny weight penalty. 
Ceramic Speed's new 17 tooth Oversized Pulley Wheel System (OPWS) offers between 2.4 and 6 watts of claimed power savings over conventional pulley systems, with only a tiny weight penalty. 
CeramicSpeed

CeramicSpeed OPWS : Oversized Pulley Wheel System : SHIMANO

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CeramicSpeed OPWS : Oversized Pulley Wheel System : SHIMANO

Brand:CeramicSpeed

Code:CSOPWS

Danish Bearing maestros CeramicSpeed have moved outside of their usual bearing-only box to create their new OPWS Pulley wheel system, after a 2013 US study of pulley wheel size indicated that there was power to be saved.

The system works by reducing the rotation speed of the pulleys, whilst also reducing the amount of tension when the chain has to bend around tighter curves of smaller pulleys. Two relatively large 17-tooth alloy pulley wheels fitted with low friction CeramicSpeed Bearings that are built to tighter tolerances than their standard size pulleys to better handle the increased side loads; these are mounted in a lightweight cage made from a carbon-reinforced polyamide. The OSPW system reduces friction in the pulleys by 60% and for optimised performance, power savings start at 2.4 watts over a standard Dura Ace 11 tooth set up.

Despite the oversized pulleys, zealous machining and careful material choice means that the whole assembly weighs just 8g more than the Dura Ace and CeramicSpeed - though not having divulged actual numbers - claim that the aerodynamic drag increase is so close to zero it's not worth discussing. Careful geometric design means that the CeramicSpeed OPWS still aloows riders to run a 28 tooth cassette which is the same as a standard Shimano Set up anyway - so their are only benefits. Indeed, it has been independently verified US company www.friction-facts.com that CeramicSpeed's new assembly even beats the Berner system so often employed by Swiss powerhouse, Fabian Cancellara.

In addition to the improvements offered by the new pulleys, Ceramic Speed say that further power savings can be made by using a higher quality chain and to that end have developed their own ultra-fast optimised UFO chains to yield claimed power improvements of up to 10 Watts.

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