7speed freehub to 9 speed

ChrisSA

Hi All,

The rear wheel on my 98 Spech Hardrock has a Shimano FH-RM40 hub. This is a 7-speed freehub and I'd like to upgrade to 9 speed.

I believe I'd have to redish the rear wheel if I went for a 9speed freehub. Can this be confirmed? There is no spacer behind the current 7-speed cassette.

nicklouse

new 8/9spd body and a redish needed minimum.

if the current hub has a 130mm OLD you will also need to adjust the frame. if alloy it aint really happening.

cavegiant

don't expect much from 9 speed, the new lower gear is massively offset by the speed that these things wear out.

njee20

Should be a 135mm OLD, but you're going to need a new rear wheel basically. Not worth it IMO.

ChrisSA

cavegiant wrote:

don't expect much from 9 speed, the new lower gear is massively offset by the speed that these things wear out.

It's the spacing (and availability on parts) that I'm after. I'm already running 11-32.

nicklouse

so what is the O.L.D.?

130 or 135?

njee20

Im almost certain it''ll be 135, they're not that old!

ChrisSA

135mm.

nicklouse

njee20 wrote:

Im almost certain it''ll be 135, they're not that old!

age has nothing to do with it. they come in both sizes.

ChrisSA wrote:

135mm.

cheers

nicklouse

there are 2 7spd RM40 hubs
one
two

you can see the 135mm configuration. remove that spacer and fit an 8/9spd body and have the wheel redished.

but as it is a 135mm OLD i would just get a new wheel.