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Engineered to answer the increasing demand for less friction, speed and a more efficient drivetrain, the Oversized Pulley Wheel System (OSPW System) represents true advancement in cycling performance. It consists of 17-tooth alloy pulley wheels fitted with CeramicSpeed bearings, a specially designed lightweight cage made from polyamide and carbon fiber, finished with titanium bolts. Compatible with Shimano 10s-11s groupsets, this innovative system is proven to reduce friction in the pulleys by 60% or more in some cases; it delivers watt savings from 2.4 watts and 3-5 times longer lifetime compared to the most commonly used high-end 11s stock pulleys.