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KACTUS 17TS Carbon Fiber Cage Ceramic Bearing Bicycle Rear Derailleur Pulley Fit for Shimano 5800/ 5700/ 4700/ 4600 & 105/Tiagra

1.Ceramic bearing//2.Full 7075 aluminum alloy material//3.KACTUS tech Logo//4.Carbon fiber cage//5.Full 7075 aluminum alloy material//6.Aluminum alloy shaft

Product Description

THE 1st ADVANTAGE: The 17T pulleys can save up to 60% frictional resistance compared to original 11T pulley.THE 2nd ADVANTAGE: If you buy the ceramic bearing version, it can save more than 2.4 watts on average each pedaling, shifting speedincreased by 20%-26% for Shimano Systems.THE 3rd ADVANTAGE: This 17TR biycle rear derailleurs can compatible up to 11-28T, 11-30T or even 11-34T cassettes. only need to add a tail hook(hanger). So they can be called the fastest RD pulley set in the world.Ceramic BearingIf you buy the ceramic bearing version, it can save save 2.4 watts on average each pedaling, shifting speed increased by 20%-26%.NOTICE: Bearings have 3 specifications (Ceramic bearing version Ceramic Bead Bearing Version NSK Steel Bearing Version), this description focuses on ceramic bearings, you can choose according to your needs1.Full 7075 aluminum alloy material//2.G3 Silicon Nitride Ceramic Beads//3.Ceramic Zirconia 17TS & 17TR installation tips:1. Due to increased offset by the oversized pulley system, please make sure your RD and frame are aligned and calibrated correctly.2. Please check the length of your chain. Here is how to calculate, chain should be 10-20mm longer than the RD at 0 tension (shown as the picture below) when rests on the smallest chainring and smallest cog.3. To lower the requirements for chain length and RD/frame alignment, we introduce the new 16T pulley system, 17TS and 17TR.Compare with 17T, the power saving would be lowered by about 0.2 watts but increasing chain stability and shifting speed