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Converting 7 speed to 9 speed

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Converting 7 speed to 9 speed

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Old 02-08-08, 08:28 PM
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Baerman
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Converting 7 speed to 9 speed

Hello, I am converting my old steel frame 7 speed bike to 9 speed. Replacing wheels,shifters,derailers, and chain of course. Will I need to replace the crankset? If so, what size spindle on the bottom bracket should I get? It's a 68mm bottom bracket if that relevant. Thanks in advance
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Old 02-08-08, 09:24 PM
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taylor p
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you should not need to buy a new crankset though you might want to
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Old 02-08-08, 09:39 PM
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Baerman
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I just upgraded my fs bike and had a few parts lying around, (rims, cassette,chain, and shifters). I resently bought a new bottom bracket for my 7 speed and was going to buy a new chain and middle crank ring for it. But then this 9 speed idea came to me. I looked online at Jensens and they have Salsa 110BCD chainrings for a reasonable amount that are 7-9 speed compatible or I could upgrade the cranks on my FS which are Truvativ Firex and put them on my steel framed bike.
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Old 02-08-08, 10:59 PM
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If your chainrings are worn down, you might need to replace them...new chain might not mix well with them.

Spindle width depends on your crankset... Changing to 9sp doesn't affect the spindle length or chainline.
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