Shimano BB-UN300 Square Taper Bottom Bracket 68/122.5mm mens It replaces the special bolt

It replaces the special bolt on the fixed (non lever) side of your bar end shifter and adds a nice little spot to attach smallish things like motor controls

For use without seat cushion

Especially sturdy when using the internal bar end handlebar mounting

Body - Engineering Grade Plastic

Easily roll bikes (up to 80 lb

Shimano BB-UN300 Square Taper Bottom Bracket 68/122.5mm mens It replaces the special boltSHIMANO Square Type Bottom Bracket MTB Standard Structure Features: 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