Shimano Tiagra Double 4600 10 Speed Chainset - 52/39T - 170mm Arm Length Yoga UVC protection: a scratchproof filter CA-078977 / T29 FRONT / 06.21 Color:Black Spruce Hose length_1550mm Outer width 23

UVC protection: a scratchproof filter integrated into the lens material protects the human eye from 100% of all harmful UV rays and blue light

This form reduces stress on the chain which ascends more easily onto the higher diameter sprockets

& Shift Modulator Mechanism which smoothes out the shifting action while pedaling

It also helps maintain a pleasant foot climate in cooler weather

Shimano Tiagra Double 4600 10 Speed Chainset 52 39T 170mm Arm Length Yoga UVC protection: a scratchproof filter CA 078977 T29 FRONT 06.21 Color:Black Spruce Hose length_1550mm Outer width 23 UVC protection: a scratchproof filter integrated into the lens material protects the human eye from 100% of all harmful UV rays and blue light This form reduces stress on the chain which ascends more easily onto the higher diameter sprockets