Shimano BB-UN300-K Bottom Bracket - English | 68 x 122.5mm| Square Taper JIS Brake Lever Hoods Offered in 27

Offered in 27

it does not significantly change the handling feel of the bar

The wider 77mm T47 shell is found on some gravel and adventure frames that use an extended shell for improved bearing placement and stiffness

The 12-32t range gives you a practical spread for flat-to-rolling terrain

Shimano BB-UN300-K Bottom Bracket - English | 68 x 122.5mm| Square Taper JIS Brake Lever Hoods Offered in 27What Bikes Need the Shimano BB UN300 K 68x122. 5mm Bottom Bracket? The Shimano BB UN300 K is the long spindle variant of the BB UN300, pairing a 68mm English threaded shell with a 122. 5mm spindle for applications where additional spindle length is needed to achieve correct chainline. The cartridge bearing construction delivers sealed, smooth rotation in a non serviceable unit with Shimano's standard sealing quality, and the integrated chain line