8/9/10 Speed Derailleur Compatibility?

Mr Plum
Mr Plum Posts: 1,097
edited April 2011 in The workshop
I need to do a bit of work on a friend's bike as he somehow amazingly managed to completely sheer off his Shimano 2300 8 speed rear derailleur at the weekend. I've told him it's a piece of sh*t and should upgrade as he's replacing it anyway, but would a 9 or 10 speed derailleur work with the 8 speed cassette and shifters?

Looking to replace it with a 9 speed Tiagra derailleur (£30ish), but he may stretch to a 10 speed 105 depending how much he can find it for.
FCN 2 to 8

Comments

  • Mr Plum
    Mr Plum Posts: 1,097
    Anyone? I'm guessing it's ok?
    FCN 2 to 8
  • nicklouse
    nicklouse Posts: 50,675
    well he will only have the same number of gears that the shifter has.

    yes a 9 spd mech will work with the same make of 7spd shifters.

    10 spd will not.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • turnerjohn
    turnerjohn Posts: 1,069
    nicklouse wrote:
    well he will only have the same number of gears that the shifter has.

    yes a 9 spd mech will work with the same make of 7spd shifters.

    10 spd will not.

    Hang on 10 speed rear mech works with 9 speed ok...on road equipment anyway !
    Can't mix shimano and SRAM shifters / mechs though (apart from cassettes as their the same spline and cog spacing)

    Have been wondering if new shimano 10speed XTR rear mech will work with 9speed XTR shifters though...anyone know ?
  • nicklouse
    nicklouse Posts: 50,675
    turnerjohn
    yes but as no replacement parts were mentioned best be safe than....


    see the topic in the MTB FAQs.

    http://www.bikeradar.com/forum/viewtopic.php?t=12733834

    and no.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • Mr Plum
    Mr Plum Posts: 1,097
    Cool, so as long as I keep it Shimano then it should be fine.
    FCN 2 to 8
  • nicklouse
    nicklouse Posts: 50,675
    Mr Plum wrote:
    Cool, so as long as I keep it Shimano then it should be fine.

    shimano Road spec mechs yes.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • jejv
    jejv Posts: 566
    Mr Plum wrote:
    I need to do a bit of work on a friend's bike as he somehow amazingly managed to completely sheer off his Shimano 2300 8 speed rear derailleur at the weekend.
    Is the hanger OK ? I wouldn't be surprised if it was bent.
    Mr Plum wrote:
    Looking to replace it with a 9 speed Tiagra derailleur (£30ish)
    Not sure that would particularly work better than Sora, or Alivio, for that matter.

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