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If you're sure it's the BB, then the UN25 or UN55 should both work fine if you get the correct spindle length. Typically torque specs are printed on a sheet of instructions that comes with the BB unit and some BBs have a sticker with the specs on the BB-shell. But torque usually varies between 30 - 40 ft-lbs on the fixed cup, and 25 - 35 ft-lbs for the adjustable (or non-fixed cup).