9 spd Shimano cassette on 7 spd Shimano 130mm hub

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UpWrong
Posts: 2409
Joined: 31 May 2009, 12:16pm
Location: Portsmouth, Hampshire

9 spd Shimano cassette on 7 spd Shimano 130mm hub

Post by UpWrong »

Will I need a spacer of some kind? Thanks.
Brucey
Posts: 44522
Joined: 4 Jan 2012, 6:25pm

Re: 9 spd Shimano cassette on 7 spd Shimano 130mm hub

Post by Brucey »

it won't fit, the 9s cassette is too wide. You can use a 7s cassette on a 9s hub with a spacer, but that is different.

What you can do is fit an 8/9/10s freehub body to your old hub in many cases but I would suggest that you use an 8-from-9 cassette (i.e. a 9s cassette with one cog missing) and use that on your 7s hub. It will go straight on, and you get to keep a significantly stronger wheel than a 130mm 9s wheel too.

Most 9s cassettes come with an essentially useless (for most folk) 11T cog; I don't regret the loss of this in any way.

cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~
UpWrong
Posts: 2409
Joined: 31 May 2009, 12:16pm
Location: Portsmouth, Hampshire

Re: 9 spd Shimano cassette on 7 spd Shimano 130mm hub

Post by UpWrong »

That's great. I never would have thought of that. I'll give it a go.
keyboardmonkey
Posts: 1121
Joined: 1 Dec 2009, 5:05pm
Location: Yorkshire

Re: 9 spd Shimano cassette on 7 spd Shimano 130mm hub

Post by keyboardmonkey »

You may need a different lock ring if you remove the 11T sprocket. I had to use a 13T lock ring to fit against the 13T sprocket on my 8-from-9 cassette.

Are you using non-indexed down tube shifters?
UpWrong
Posts: 2409
Joined: 31 May 2009, 12:16pm
Location: Portsmouth, Hampshire

Re: 9 spd Shimano cassette on 7 spd Shimano 130mm hub

Post by UpWrong »

No, my RD shifter is indexed. I assume I can just limit travel so it covers 8 sprockets rather than 9.
Brucey
Posts: 44522
Joined: 4 Jan 2012, 6:25pm

Re: 9 spd Shimano cassette on 7 spd Shimano 130mm hub

Post by Brucey »

you should be able to do that without any issues.

cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~
stuartg
Posts: 143
Joined: 27 Jun 2007, 8:53pm

Re: 9 spd Shimano cassette on 7 spd Shimano 130mm hub

Post by stuartg »

Just check to see if the free hub is IG or HG. I have a 7 speed IG and the spline is different to a HG, so without a bit of modification a modern cassette won't fit.
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Redvee
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Joined: 8 Mar 2010, 8:58pm

Re: 9 spd Shimano cassette on 7 spd Shimano 130mm hub

Post by Redvee »

stuartg wrote:Just check to see if the free hub is IG or HG. I have a 7 speed IG and the spline is different to a HG, so without a bit of modification a modern cassette won't fit.


IG & HG are the same spline pattern, you may be getting UG and HG confused. UG had equal spines, IG/HG and an odd spline and UG was 6 speed IIRC.
beardy
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Joined: 23 Feb 2010, 4:10pm

Re: 9 spd Shimano cassette on 7 spd Shimano 130mm hub

Post by beardy »

UG went on to 7 speed as well.
Brucey
Posts: 44522
Joined: 4 Jan 2012, 6:25pm

Re: 9 spd Shimano cassette on 7 spd Shimano 130mm hub

Post by Brucey »

actually UG existed in 5s,6s,7s and (briefly) 8s form.

cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~
stuartg
Posts: 143
Joined: 27 Jun 2007, 8:53pm

Re: 9 spd Shimano cassette on 7 spd Shimano 130mm hub

Post by stuartg »

Doh. Yes you are right, I meant UG. I have nice exal hub 7 speed on UG and the cassette options are limited and expensive.
keyboardmonkey
Posts: 1121
Joined: 1 Dec 2009, 5:05pm
Location: Yorkshire

Re: 9 spd Shimano cassette on 7 spd Shimano 130mm hub

Post by keyboardmonkey »

stuartg wrote:Doh. Yes you are right, I meant UG. I have nice exal hub 7 speed on UG and the cassette options are limited and expensive.


This may be of some use to you:

http://cycleseven.org/fitting-hyperglid ... de-freehub
stuartg
Posts: 143
Joined: 27 Jun 2007, 8:53pm

Re: 9 spd Shimano cassette on 7 spd Shimano 130mm hub

Post by stuartg »

Many thanks. I have contemplated filing down the hub to accept HG, as per one of sheldons Articles, but this is an interesting alternative.
Brucey
Posts: 44522
Joined: 4 Jan 2012, 6:25pm

Re: 9 spd Shimano cassette on 7 spd Shimano 130mm hub

Post by Brucey »

stuartg wrote:Many thanks. I have contemplated filing down the hub to accept HG, as per one of sheldons Articles, but this is an interesting alternative.


The freehub body is very hard; if you are trying to modify it you can machine it using a carbide-tipped tool or you can grind it. Filing it will just wreck the file (cheap or expensive).

Modifying HG cogs is a lot easier; you can file them (if you don't mind wrecking a cheap file) but better still to grind them. You can do it with a dremel tool but a full-on die grinder works best.

In the long run fitting an HG freehub body makes a lot of sense. If you want to do this, I'd suggest that you do it soon, while 7s HG freehub bodies are still readily available.

cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~
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