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 Post subject: 7/8/9 spd
PostPosted: Mon Nov 19, 2007 12:32 am 
Retro Guru
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Joined: Wed Aug 29, 2007 8:29 pm
Posts: 370
Location: Peterborough
Right - daft question perhaps :oops: , but here goes...

What combination of cassette, freehub body and hub is required to run 8 or 9 cogs at the back?!
I only have 7spd on my two and therefore know nothing of the wonders of 24 and 27spd :shock:

e.g. can I put an 8spd cassette on my existing freehub body or do I need a new freehub, in which case will it fit the hub I have or do I need one with more space between drive side flange and the dropout?

See told you it was daft but I'm about to fit the M900 shifters and shortly (hopefully) new hubs, so I figured now was a good time to clarify :)

Thanks
W


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 Post subject:
PostPosted: Mon Nov 19, 2007 12:45 am 
Dirt Disciple

Joined: Thu Aug 16, 2007 6:50 am
Posts: 40
Location: Melbourne, Australia
http://www.sheldonbrown.com/k7.html - scroll right to the end.

Sheldon has all the answers, I recently converted my 7 speed LTS to 9 speed with no problems (after purchasing the appropriate Shimano freehub).

Regards, Mark.


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 Post subject:
PostPosted: Mon Nov 19, 2007 12:51 am 
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Joined: Wed Aug 29, 2007 8:29 pm
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Location: Peterborough
Mmm... much readage will ensue. Something for the train to work tomorrow me thinks - not awake enough to take it in right now LOL!

Thanks for the link Mark!!!


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 Post subject:
PostPosted: Mon Nov 19, 2007 10:52 am 
Gold Trader
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Joined: Sat Jul 29, 2006 11:14 pm
Posts: 3855
Location: Somerset
I had 8 speed fairly early on, using a Shimano Ultegra freehub body on an M730 XT hub. ( I was cock of the walk for a week I can tell ya!)

IIRC 8 speed and 9 speed use the same freehub, but the spacing is different so new chain and rings are requred.


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 Post subject:
PostPosted: Mon Nov 19, 2007 1:35 pm 
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Joined: Sun Jul 16, 2006 3:28 pm
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Location: The Netherlands
Like this?

Image


Last edited by LTS Biker on Tue Nov 20, 2007 11:22 pm, edited 1 time in total.

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 Post subject:
PostPosted: Tue Nov 20, 2007 3:47 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8222
Location: New Forest, UK
You can also run a 9 speed cassette on a 7S hub by removing one set of cogs - so you get an 8S spaced as 9. It's quite handy as a halfway house to keep some trick old hub going!


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 Post subject:
PostPosted: Tue Nov 20, 2007 4:43 pm 
retrobike rider / Gold Trader
retrobike rider / Gold Trader
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Joined: Tue Nov 14, 2006 2:27 pm
Posts: 2728
Location: In the Woods. . .
without faffing on chopping cassettes and swapping freehub bodies, there are two freehub boby lengths:
7sp and 8 sp.
A 9sp fits on the 8 by using closer cog spacings.

(Essentially so does road 10, but we won't get in to that. . ..) :wink:

9 speed cassetes therefore require dedicated narrow chains and shifters. 7 speed humbies will go to 8 as the difference in spacing is enough that the floating jiocky can accomodate it


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