Note: Image above is for illustration purposes only

Genuine SHIMANO quality/performance cartridge bearing square bottom bracket with stainless steel casing and aluminium adapter. The UN-55 model has been deleted from the range, but is of better quality and finish than the UN300 bottom brackets, so if this is the size you need, grab it! NB: This bottom bracket is for a 73mm frame shell, so you may have an old GT or similar.

 

The Bicycle Depot Technical Top Tip: If replacing a Shimano bottom bracket, check that the old one is the correct length before disassembly, that way you'll know for sure what axle length to buy. If unsure of the axle length and type you need, consult a professional bicycle mechanic.