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7speed freehub to 9 speed

ChrisSAChrisSA Posts: 455
edited November 2010 in MTB workshop & tech
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.

Posts

  • nicklousenicklouse Posts: 50,675 Lives Here
    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.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • cavegiantcavegiant Posts: 1,546
    don't expect much from 9 speed, the new lower gear is massively offset by the speed that these things wear out.
    Why would I care about 150g of bike weight, I just ate 400g of cookies while reading this?
  • njee20njee20 Posts: 9,613
    Should be a 135mm OLD, but you're going to need a new rear wheel basically. Not worth it IMO.
  • ChrisSAChrisSA Posts: 455
    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.
  • nicklousenicklouse Posts: 50,675 Lives Here
    so what is the O.L.D.?

    130 or 135?
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • njee20njee20 Posts: 9,613
    Im almost certain it''ll be 135, they're not that old!
  • nicklousenicklouse Posts: 50,675 Lives Here
    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
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • nicklousenicklouse Posts: 50,675 Lives Here
    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.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
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