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Old 07-01-09, 09:44 PM   #1
ariel.trees
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6spd to 8spd cassette?

Recently for my not-vintage GT 7spd I replaced wheels and, because the wheels are for 8, 9, 10, I added 4.5mm of spacers to make it fit. Could I have used an 8spd cassette?

If so, could I put an 8spd cassette on a new set of 700c wheels for Mr. Raleigh, who has a 6spd cassette on 27 1 1/4 currently?
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Old 07-01-09, 09:54 PM   #2
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Mr. GT could use an 8 or 9 speed cassette, but that's when the chains get narrower and you might need to replace your front chainrings (not positive).

Mr. Raleigh probably has a 126mm dropout spacing, and the 700c wheels with a 8spd cassette are probably for a 130mm spacing, so it'll probably squeeze in ok. Again, 8spd = narrow chain so there could be more upgrades than just a cassette to worry about. Plus you need to make sure your brakes have at least 4mm of downward adjustment to make sure they'll work with the smaller diameter 700c wheels.
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Old 07-06-09, 06:35 AM   #3
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Thanks!

I was planning on replacing chains when I replaced cassettes--but didn't think of the front chainrings.

Thank you.
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Old 07-06-09, 07:35 AM   #4
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8-speed chain = 7-speed chain = 6-speed chain = 5-speed chain

A 9-speed chain is narrower, and a 10-speed chain is narrower still.
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Old 07-06-09, 07:55 AM   #5
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If the bikes are friction shift - you just have the problem of frame spacing and OLD. If you've got indexing, the tooth spacing on 7 and 8 are so similar you can get one to shift the other.

For the GT since you could already fit the 8s hubs, yeah, you could've gone 8.

Mr R will need his dropouts spread to take the hub and have to have the brakes worked out.
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