Respacing a 9 speed cassette

louismichaels Posts: 118
edited May 2009 in Workshop
If I wanted to respace a 9 speed cassette (let's say an 11-34) for use with a 10 speed system (Ultegra 10 speed STI levers and derailleur) what width of shim/spacer should I use?
This is so I don't potentially run out of gears on big, long mountain climbs.
Any ideas gratefully received.


  • Mister W
    Mister W Posts: 791
    You can't.
  • louismichaels
    louismichaels Posts: 118
    Even if I take the cassette apart and use a different thickness spacer?
  • nicklouse
    nicklouse Posts: 50,675
    well you need a 10spd cassette and the spacer that come with it.

    shimano 8/9 speed freebodies are compatable with the newer 10spd cassettes. but you need that spacer.

    see here.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • flasher
    flasher Posts: 1,734
    Why don't you just buy a cheap 10 speed cassette?
  • louismichaels
    louismichaels Posts: 118
    It's not a cost issue.
    It just appears that with a ten speed system, the largest cassette cog is a 27 (Shimano), 28 (SRAM) or 29 (Campag, but not compatible).
    So, I thought, if I respace a 9 speed cassette (which go up to 34), I can stick with my 10 speed system and take advantage of the lower gearing!
  • avoidingmyphd
    avoidingmyphd Posts: 1,154
    get your wallet out: ... x_launch09

    SRAM's new xx groupset will feature 10 speed 11-32 and 11-36 cassettes.

    singletrack reckon over 300 usd for one though: ... -close-up/

    seriously, though, at some point a cassette that meets your needs and costs a sensible amount will surely hit the market, if there isn't some obscure one out there already? if you start messing with the 9 speed, the shifting is bounds to be a fool up.

    (finally, pedant alert: shimano will soon go to 28 when the new ultegra is available. this doesn't help you though)
  • flasher
    flasher Posts: 1,734
    You can get a Marchisio cassette up to a 30. Not a cheap option but they do work.
  • RedJohn
    RedJohn Posts: 272
    Have a look here - up to 30T shimano or Campag ... sette.html
  • RedJohn
    RedJohn Posts: 272
    Oops beaten to it!
  • Monty Dog
    Monty Dog Posts: 20,614
    Obviously depends on the model of cassette and whether you can pull it all apart into seperate spacers. I've done this with 8 and 9 speed cassettes including making Campagnolo spaced cassettes for MTB hubs - the joy of a Campagnolo drivetrain and disc brakes. Highpath Engineering will do you a set of spacers for £15 or you may find one of the Mavic spacer kits may suffice.
    Make mine an Italian, with Campagnolo on the side..
  • louismichaels
    louismichaels Posts: 118
    Many thanks for the advice and links.
    Will have a look around...