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PostPosted: Wed Sep 03, 2014 12:45 pm 
Dirt Disciple

Joined: Wed Feb 04, 2009 2:53 pm
Posts: 47
Location: Derbyshire
Hi,

I've got a Suntour XC Pro rear hub and am struggling to find a 7 speed cassette for it. Does anyone know if a Suntour 8 speed cassette will fit or will it be too wide (like Shimanos are)?

Any help appreciated.

cheers


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PostPosted: Wed Sep 03, 2014 2:28 pm 
Old School Grand Master
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Joined: Fri Dec 10, 2010 10:40 pm
Posts: 4061
Location: The Royal Society of Insobriety
It will not, and to further complicate matters not all 7 speed will work either as there was MD and non-MD variations. Essentially there are several freehub body lengths, and cassettes were designed so that 7 speed had a single sprocket lock ring and 8 speed had a double sprocket lock ring.

Cassette spline lengths:
6 speed = 23.7mm
7 speed = 26.1mm
8 speed = 30.8mm

Non MD lengths:
7 speed MD = 20.7mm
8 speed MD = 25.4mm

Image

*stolen from the internet somewhere


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PostPosted: Wed Sep 03, 2014 2:35 pm 
Dirt Disciple

Joined: Wed Feb 04, 2009 2:53 pm
Posts: 47
Location: Derbyshire
Thanks very much for your help.

I suspected that to be the case, never mind will keep hunting for 7 speed MD cassette


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PostPosted: Wed Sep 03, 2014 7:27 pm 
retrobike rider / Gold Trader
retrobike rider / Gold Trader
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Joined: Thu Jul 09, 2009 2:12 pm
Posts: 3187
Location: Yateley, Hants.
The freehub bodies are interchangeable so if you can find one and a cassette you could put on a normal 7s body and cassette.

Carl


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