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PostPosted: Thu Feb 25, 2010 12:18 pm 
Dirt Disciple

Joined: Sun Jan 31, 2010 6:32 pm
Posts: 45
Hello, sorry about the second Advice thread, but piecing together some more old bits.

I've a rear wheel with shimano 7 speed freehub, can this be replaced to run shimano 8 or 9 speed as I know the cassettes are different?

thanks

Iain


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PostPosted: Thu Feb 25, 2010 2:12 pm 
Retro Guru

Joined: Wed Dec 10, 2008 9:19 am
Posts: 2094
Location: Sheffield, top city
the options you have are to use say only seven cogs from a 9 speed cassette on your freehub. you then get the 9-speed index spacing, but will only have 7 gears.

alternativley, you can replace the freehub with a 9 speeder. but you will face some problems - the axle & skewer might not be long enough for the extra width, and you will need additional spacers. The wheel will also need redishing (centering-up) cos the rim wont be central to the axle which is now wider on the freehub side.


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PostPosted: Thu Feb 25, 2010 2:15 pm 
Dirt Disciple

Joined: Sun Jan 31, 2010 6:32 pm
Posts: 45
hi that's great thanks for your help, much appreciated, Iain


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PostPosted: Sat Feb 27, 2010 2:13 am 
BoTM Winner / Gold Trader
BoTM Winner / Gold Trader
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Joined: Fri Feb 26, 2010 12:36 am
Posts: 4715
Location: Burlington, ON Canada
+1

You'll have to re-space the axle, dish to suit, and hope you have enough bottom adjustment on your derailleur.


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PostPosted: Fri Mar 05, 2010 2:01 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8202
Location: New Forest, UK
If you use a 9 speed cassette as a starting point and remove the largest cog and spacer, it's EXACTLY the same size as 7s...which is handy. :D

You need to start with cheaper cassettes (105 or lower) as the upmarket ones have an alloy cog carrier which doesn't split.


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PostPosted: Fri Mar 05, 2010 2:17 pm 
Retro Guru

Joined: Wed Dec 10, 2008 9:19 am
Posts: 2094
Location: Sheffield, top city
hamster wrote:
You need to start with cheaper cassettes (105 or lower) as the upmarket ones have an alloy cog carrier which doesn't split.

what about ditching the smallest cog? Or is that different? (please dont read the last question as sarcastic, its a genuine question)


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