The system is fitted with a custom designed, strong carbon fiber pulley cage assembly for long durability and light weight. The cage design allows you to choose between two spring tension settings to customise performance and reduce chain drag. We recommend initial setup in the lower spring tension. This has been designed to leave the clutch mechanism fully functional for chain retention. In the event that the low spring tension does not provide adequate shift quality on real rough roads, you can increase it to the high spring tension which corresponds to the factory settings. Thanks to the high-quality CeramicSpeed Bearings inside, your product will benefit from 3-5 times longer lifetime compared to stock.