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11 & 9 Speed Bikes on same Direct Drive Trainer

rank_amateurrank_amateur Posts: 117
I’m a bit embarrassed to ask this after 40 odd years of cycling..... I’m contemplating buying a direct drive trainer, like the Tacx Neo - for me using my 11 speed, 105 bike and possibly for the Mrs using her 9 speed, Sora bike. Do I need to swap cassettes/spacers every time or would her bike fit and just align with 9 of the 11 available cogs in the cassette? Thanks.

Posts

  • webboowebboo Posts: 5,477
    I suspect that a 9 speed chain would be too wide for an 11 speed cassette.
  • MatthewfalleMatthewfalle Posts: 17,380
    isn't 11 speed cassette spacing also different so shifting won't work?

    what you guys need is a turbo only bike - you just need a frameset, prop for forks (not even a front wheel), and cockpit/drivetrain - no brakes etc.

    so long as the bike fits you both as close as dammit its a winner and should cost you barely next to nothing.
    Postby team47b » Sun Jun 28, 2015 11:53 am

    De Sisti wrote:
    This is one of the silliest threads I've come across. :lol:

    Recognition at last Matthew, well done!, a justified honour :D
    smithy21 wrote:

    He's right you know.
  • lemonenemalemonenema Posts: 212
    no it wont work at all! youll definitely need to use a different cassette to match the bikes gearing
  • keef66keef66 Posts: 13,123
    You clearly need to upgrade your missus's bike to 11 speed. :D
  • lemonenemalemonenema Posts: 212
    hell no! 9spd all the way man
  • Thanks all. Yeah, I suspected the spacing at least would be different.
    A dedicated turbo bike between us wouldn’t work, as I’m a foot taller, and upgrading her bike to 11 speed would deprive me of stuff for my fleet....so that’s not gonna happen :D
    No big deal, I can swap cassettes easily enough.
    Cheers.
  • whyamiherewhyamihere Posts: 7,629
    If you just want to use erg mode then you can make it work because you don't have to shift, the trainer just adjusts the resistance regardless of which gear you're in. For sim mode, you will need to switch them around.
  • yellowv2yellowv2 Posts: 275
    Unfortunately I think the chain will still be a problem.
  • MatthewfalleMatthewfalle Posts: 17,380
    yup - the 9 speed chain probably won't work with the 11 speed cassette due to sizing and vice versa.
    Postby team47b » Sun Jun 28, 2015 11:53 am

    De Sisti wrote:
    This is one of the silliest threads I've come across. :lol:

    Recognition at last Matthew, well done!, a justified honour :D
    smithy21 wrote:

    He's right you know.
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