Bicycle Mechanics - What The!!!
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07-21-03, 02:05 PM
Arg, putting together a bike is one headache after another! I am trying to replace a 7 speed cassette with a 9 speed cassette, and now the 9 speed cassette doesn't fit on the freehub!!! What do i do?!?!?!??!?!!
7 speed to 9 speed? on the same hub?
The spacers for the cogs would need to be narrower,
and I don't know if a 7speed hub can take a 9 speed
any of the real wrenches know ?
07-21-03, 03:02 PM
No, you can not put a 9-speed cassette on a 7-speed hub. Sorry.
You can, however, put 8 cogs of the 9-speed hub on. That's the best you can do.
07-21-03, 03:06 PM
So i essentially need a new hub? *sigh*
07-21-03, 04:22 PM
You could go through the hassle of replacing the freehub body, but then you would mess around with spacing, blah, blah, and blah. :rolleyes:
Yes, get a new hub, or wheel for that matter! Much easier!
However, how are you going to shift gears on a 9-speed cassette with a 7-speed shifter? Do you have 9-speed compatible ders, or a 9-speed chain? Crankset?
It might be worth your efforts to buy a 9-speed bicycle...
07-21-03, 06:01 PM
I already have everythign else for a 9 speed bike, Shimano XT rear der, LX crank, LX cassette, XT chain, LX shifter set. Because the hubs aren't labeled "9 speed hub", "8 speed hub", i just assumed my old one would work.
Your best shot is to use 8 of the 9-speed cogs, with the 9-speed spacers, the 9-speed chain, and the 9-speed shifter. (You can use either the 8-speed or the 9-speed rear derailleur.) I believe Sheldon Brown mentions this option in one of his websites.
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