Shimano UN55 bottom bracket
The UN55 is a perfect choice when looking for an economical BB with sealed-cartridge bearings.
• 68mm English or 70mm Italian-threaded
• JIS square taper
• spindle length: 107mm, 110mm, 113mm
• requires Park Tool BBT-22 for installation & removal
• weight: 313g (110mm)
The crankset being used determines spindle length, not the frame. Please check what length the crank manufacturer recommends or measure your existing BB's spindle.