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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 10-15-03, 02:31 PM   #1
pricephoto
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chain length

i am changing my ultegra cassette from a 11-25 to 12-27- will i need to lengthen my chain or still be able to use my old one (with very little wear)????
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Old 10-15-03, 03:30 PM   #2
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New chain.

You shouldn't need to lengthen it, but get a new chain anyway. And measure it out correctly
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Old 10-16-03, 05:28 PM   #3
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You may need a longer chain. By changing to a larger rear cog the overall circumferance of your drivetrain is larger. This means you may need a longer chain. Shift into the big/big combination. Is you chain taught or is there some looseness to it? If its taught you need to go longer.....

Just remember you only need a link or 2 longer, any more than that may give un-wanted slack in the small/small
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