Square taper's not dead! Well, it is actually, but that doesn't mean your zombie steed shouldn't be able to roam the streets with you astride its back. Keep your vintage machine spinning smoothly with a Shimano UN-55 Square Taper Bottom Bracket and its sealed cartridge bearings ...Square taper's not dead! Well, it is actually, but that doesn't mean your zombie steed shouldn't be able to roam the streets with you astride its back. Keep your vintage machine spinning smoothly with a Shimano UN-55 Square Taper Bottom Bracket and its sealed cartridge bearings.
Remember, never grease the axle flats of a square-taper bottom bracket, and resist the urge to put your Incredible Hulk strength into tightening the cranks down. Just go nice and snug!