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 Post subject: 7 speed to 9 speed
PostPosted: Sun Jun 24, 2012 12:53 am 
Retro Guru

Joined: Fri Mar 09, 2012 3:39 pm
Posts: 458
Location: gateshead
hi there i am changing my gt lts 3 to a 9speed but someone mentioned to me about the bottom bracket

Would i have to make it bigger or get a bigger one lol
standard bb is 73x113 at the moment but with the two extra rings was thinking should i change the bb for a bigger one

cheers and sorry for these daft questions of mine comes with being a joiner measure 3 times cut once


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 Post subject:
PostPosted: Sun Jun 24, 2012 1:45 am 
Gold Trader / rb Rider / Special
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Joined: Mon Aug 31, 2009 12:26 am
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Location: Rurally close.
Is that from 1x7 to 3x9??


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 Post subject:
PostPosted: Sun Jun 24, 2012 1:50 am 
Retro Guru

Joined: Fri Mar 09, 2012 3:39 pm
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Location: gateshead
21 speed to 27 speed mate sorry

cheers


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 Post subject:
PostPosted: Sun Jun 24, 2012 1:52 am 
Gold Trader / rb Rider / Special
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Location: Rurally close.
Cant see there being any problems.
9 speed uses the same freehub width as 7.


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 Post subject:
PostPosted: Sun Jun 24, 2012 2:26 am 
Retro Guru

Joined: Fri Mar 09, 2012 3:39 pm
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Location: gateshead
ok mate will give it a try when i get the bits next week cant wait to be honest

cheers for the info cyfa


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 Post subject:
PostPosted: Sun Jun 24, 2012 7:48 am 
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Joined: Mon Aug 15, 2011 8:21 pm
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Location: Paignton
cyfa2809 wrote:
Cant see there being any problems.
9 speed uses the same freehub width as 7.

I think you're wrong - 7 speed freehub is narrower than 8/9 speed one. ;-)


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 Post subject:
PostPosted: Sun Jun 24, 2012 8:08 am 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8202
Location: New Forest, UK
Bit anyway you still need the chain set in almost exactly the same place - the centerline is only a couple of mm different.


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 Post subject:
PostPosted: Sun Jun 24, 2012 8:29 am 
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hamster wrote:
Bit anyway you still need the chain set in almost exactly the same place - the centerline is only a couple of mm different.

Yeah, I wouldn't bother changing the bottom bracket only for this reason. And I didn't when I converted some time ago.


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 Post subject:
PostPosted: Sun Jun 24, 2012 4:01 pm 
Gold Trader / rb Rider / Special
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But you can get a 7 speed cassette on a 9 speed freehub body and only need limit screw adjustment, and on a 7 speed freehub equipped hub the spacing is largely the same?

Im not very good at explaining things sometimes.


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 Post subject:
PostPosted: Sun Jun 24, 2012 6:48 pm 
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Location: Midlands, UK
I had my MF Alu Comp converted years ago, but Im sure I got a new set of wheels at the same time. As long as the frame has 135mm and not 130mm spacing between the dropouts on the rear, you should be fine. Get hold of a cheap 9speed cassette and see if it fits, unless anyone else can advise?


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