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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 04-25-07, 08:09 PM   #1
JesusGarcia
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Another BB question...

Hello... newbie here... I'm upgrading my vintage Vitus Cilo (1989) with a new-old-stock bottom bracket. Currently, it has a Specialized bb w/ Italian threading 36 x 24F, 70mm hub width, 110mm (I think) spindle length. I want to replace it with a Shimano UN10, 36 x 24T, 70mm hub, 115mm spindle to ease up on the chain angle when using high gear (39 chainring - 13t sprocket 7-speed and 130mm hub spacing from previous 126mm)... Firstly, is the threading 24F and 24T the same? Secondly, is 115mm spindle length too much. Thank you in advance...
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Old 04-25-07, 08:16 PM   #2
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The threading should be the same. Chainline - guessing here that you will kick your chainline out 3-4mm, just don't know the symmetry of the Specialized vs. Shimano to give you a precise answer.
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