I am confused as hell with this, I have a circa 1991 mavic rim with a deore hub of the same age, its 7speed.
Can I transplant a 10 speed freehub onto it and then get someone to realign it or what not?
so close to having a new bike but can't afford to buy new wheels.
An 8 or 9 will fit on and (I think) take a 10s cassette.
A 10 may fit on but check - newer xt and perhaps other freehubs fit on differently.
You may need to play with spacers & dishing, and dustcaps/seals.
No.2 sizes of freehub.7 speed or 8/9/10 speed. You can however fit 7 speed cassete to 8/9/10 speed freehub if you use a spacer.
You can fit an 8, 9 or 10 speed cassette if you leave 1 sprocket off.
The respective 8/9/10 shifter/mech combo will then let you use all that is on the hub.
SheldonBrown detailed this as '8 out of 9 on a 7'.
It is a lot of trouble to fit a 10-speed freehub then re-dish the wheel to get a 10-speed set-up.
How much is a Deore disc 8/9/10 hub with a 317 rim today?
I have used 9-speed disc-hub wheels with a V-brake rim you can buy starting at £10 collected.
PaulD
bobgarrod is right, 7spd freehub is too narrow. If you could buy a longer freehub to fit your hub you would need to adjust the spacers and re-dish the wheel - may as well buy a new wheel.
IMHO you can do it. Easily. The free hub does need changing to a 8/9/10 one. It may or may not fit. If not you just add a spacer on the rhs and move the axle a bit to cope. At the worst a longer axle but many are a touch wider than needed anyway. Try and find a knackered wheel with an 8 speed cassette to take the freehub from.
Annoyingly freehubs are a stupid price for a crap design so even a cheap wheel new can be better.
I have done this more than once with no issues except finding the freehub cheap.
Cost shouldn't be too bad...find ANY 8/9s rear hub, bound to be something at a decent price somewhere, the OLD is the same so no need to change the axle, use the new DS cone etc to match freehub sealing arrangement, re-dish as nec (shouldn't need much).
Shop shouldn't charge too much for the work if you can't do it - £20?
thanks for the replys,
i have a old set of specialized wheels that came with a 2001 rockhopper that are 9 speed as the old seven speed wheels were deore would there be a compatibility clash with that freehub?
Do i need a shimano specific one?
Your wheels from the Rockhopper will be OK.
The rear hub may be 135mm and your 7-speed frame only 130mm.
If the old frame is steel or aluminium it should spread accordingly and be OK.
Sounds as if you have it sorted.
You will need a rear mech and shifter to match the cassette.
Swapping freehubs and redishing the wheel is a lot of work/expense if you can avoid it.
PaulD
PaulD - not quite
7 speed mtb frames will be 135mm not 130mm.
You don't need to change rear mech though the chain and shifter would need to change
Swapping freehub bodys and redishing is very easy if you're half way mechanically minded.
(Assuming Shimano components)
i have a old set of specialized wheels that came with a 2001 rockhopper that are 9 speed as the old seven speed wheels were deore would there be a compatibility clash with that freehub?
Do i need a shimano specific one?
the Spesh wheels should be fine.
Clubber - not quite
You don't need to change rear mech though the chain and shifter would need to change
You need a 10 speed mech to run with a 10 speed shifter and cassette.
clubber right re OLD, but a specialised freehub WILL NOT fit the shimano hub.
7 speed mtb frames will be 135mm not 130mm.
I have a 1990 GT and that is 130mm but spreads easy to take a 135 OLN hub
Some 1990 frames would have still been 6 speed though...
Al's right on the freehub - I misread the post and thought the OP was asking if he could use the spesh wheels.
And yes, of course, 10 speed shifters will need a 10 speed rear mech (unless of course you use the road 10 speed flat bar shifters in which case an 8/9 rear mech will be fine 
rootes1,
Thanks for the 130mm comment.
I still have an old CroMo frame from 1989 that came with a Shimano GS200 21-speed groupo and is a 130mm rear.
I have an alloy Grisley Orion 5 from early 90s that came with Shimano Altus (spit) and is 135mm.
I have tried to steer the OP from trying to redish the wheel himself or pay an LBS to do it as it is avoidable problem/expense.
If he is asking about gear/hub compatibility I doubt he has experience redishing a wheel.
PaulD
oDD...i THOUGHT ALL SHIMANO hg WAS 135 (& 130 PRIOR TO THAT, I.E. 1989)
Damn CL
Anyway I suspect GS200 is younger than that, I was working in LBS at that time and don't remember it.
al,
I bought the Eclipse CroMo fully-rigid in November 1989 with the GS200 set. It was new for 1990 and £330. I have the original receipt and most of the GS200 set, albeit in a box rather than on a bike. The combo shifters look big enough to fit a motorbike and had leverage for cantis.
The front shifter had trim tho', so some good things can disappear!
PaulD
I now have this sorted with the purchase of a new 10spd 105 hub, going to get it laced to the older MA40 rims and be happy as I have pretty much managed to get Dura ace everything else for very little money
Just need a saddle now, thanks for all your replys.
http://sheldonbrown.com/frame-spacing.html
He missed the 165mm Santa Cruz Super 8 standard, although I'll forgive him for missing the 142....
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