Sheldon has a chart showing the various cassette cog & spacer thicknesses:

http://sheldonbrown.com/k7.html#transplant

Notice how the variations appear quite small but when you stack up enough of
them, it can make a difference.  There's also a good discussion of freehub
body transplants, etc.  

Not sure if there's a similar chart for freewheels but Harris is the best
source I know of for research.

dougP

-----Original Message-----
From: rbw-owners-bunch@googlegroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of tallsteelbikes
Sent: Wednesday, December 03, 2008 11:26 AM
To: RBW Owners Bunch
Subject: [RBW] Re: cassettes vs freewheels


The cog spacing got tighter when they went from 6 to 7 not from 7 to 8
speed.  That is why you need a spacer with the 7 speed cassette on the
8 speed hub.  When they went from 8 to 9 they made the cog spacing
even tighter.  That is why 8 and 9 speed use the same hub body.

So if you want a stronger wheel with less dish go with 7 speeds or
less on a 7 speed freehub cassette system or a 5/6/7 speed freewheel
system.

Who really needs or wants 8/9/10 speeds and weaker wheels with more
cost and maintenance anyway?  Only reason is if you are stuck on STI
or just need the latest gadgets to keep up with the Jones'.

Cheers,  Chris

tallsteelbikes.googlepages.com





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