UPPER:  3D co-molded foam and durable synthetic skin

For use on rear wheel

The SHIMANO GRX RX400 front derailleur offer lighter front shifting operation and easier setup thanks to the new link construction and integrated cable tensioner

DIAMETER (mm): 35

Integral mold seals keep out the elements

SHIMANO BB-UN300 Bottom Bracket - 68 x 117.5mm - Square Taper giant UPPER: 3D co-molded foam andSHIMANO Square Type Bottom Bracket MTB Standard Structure Square Type Bottom Bracket SHIMANO quality performance cartridge bearing square bottom bracket Better chainline stability with chain line stabilizer 3 structures available Standard, E type, chain case options Adapter material: Aluminum