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Using 9-speed sprockets for an 8-speed cassette

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Using 9-speed sprockets for an 8-speed cassette

Old 03-11-11, 08:44 PM
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Using 9-speed sprockets for an 8-speed cassette

Is it possible to use 9 speed sprockets with 8-speed size spacers to create an 8-speed cassette? If I'm not mistaken, 9-speed sprockets are a bit narrower than 8 speed - will this matter? I thought it was only the space in between the sprockets that really effected shifting.

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Old 03-11-11, 08:53 PM
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I've never tried it, but I would suspect it would affect shifting. If I was going to do it, I would be sure to add a spacer or two as needed to assure the cassette is tight on the hub (been there, done that with a cassette not tightened enough). Also, I would tune the rear derailer from the MIDDLE of the cassette, not first gear as is normal for tuning Shimano derailers. This would limit the affect of the gear thickness. I'm assuming you are using 8 speed spacers.
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Old 03-12-11, 07:05 AM
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I don't know how much narrower the actual cogs are.
On the outside, not sure if you can substitute 9sp there due to the built-in spacers.
What size cogs do you need, or are you just tring to lighten things up?
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