Shimano BB-UN300 English Square-JIS 68 x 127.5mm Bottom Bracket recumbant New shift ramp designs provide

New shift ramp designs provide the fastest

Compatible with recessed cleat SPD shoes for walking ease

Pearl Izumi gave this jacket a relaxed fit to allow for multiple layers of insulation

vinyl dipped handle for leverage and comfortable use

M6 stainless steel bolt with integrated washer

Shimano BB-UN300 English Square-JIS 68 x 127.5mm Bottom Bracket recumbant New shift ramp designs provideSHIMANO Square Type Bottom Bracket MTB Standard Structure 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