Thread: Play in the Bottom Bracket - What's wrong with my Bottom Bracket?
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Old 08-31-25 | 10:44 AM
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maddog34
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Bikes: 1982 Trek 930R Custom, '91 Diamondback Ascent w/ XT, XTR updates, Fuji Team Pro CF road flyer, Specialized Sirrus Gravel Convert, '09 Comencal Meta 5.5 XC, '02 Marin MBX500, '84 Gitane Criterium bike

jump to 7:15 or so.. cup and spindle, in a decent lugged CroMo frame... for reference.

there is a small chance that the cups and spindle are ok.. a close inspection of the bearing contact surfaces will tell you if you need a new BB assy or not
and i too recommend the UN300 BB assy... i just ordered two for the shop.. one for a repair job, and one for stock.

caged bearings cost between 3 and seven dollars, shipped, eack... i just paid 16.84, each, shipped, for two 73 wide x 118mm long UN300s.(fits a fairly Modern triple in an MTB, in my case.. yours will be a 68mm x (TBD) size.)
they require a different tool for install/removal, compared to the cup/spindle setup your world sport originally came with .
Last edited by maddog34; 08-31-25 at 10:49 AM.
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