Shimano BB-RS501 Hollowtech II Italian Bottom Bracket Lake the RSO1A is offered in

the RSO1A is offered in a variety of color options

It includes threaded inserts for thru axles with a 1

performance and lightness

If you're a cyclist

Includes a dedicated E-tube Di2 cable connector that easily pulls through a 6mm frame hole

Shimano BB-RS501 Hollowtech II Italian Bottom Bracket Lake the RSO1A is offered inSHIMANO TIAGRA Bottom Bracket Threaded HOLLOWTECH II 68 70 mm shell width The SHIMANO TIAGRA bottom bracket uses a new seal construction for long lasting performance. MODEL NO BB RS501 SERIES SORA R3000 Series Average weight 93 HOLLOWTECH II bottom bracket Threaded bottom bracket type Threaded bottom bracket shell width (mm) 68 Threaded bottom bracket shell width (mm) 70