Do I need a long rear mech?

DazzaBT Posts: 37
edited July 2013 in Workshop
I have a planet X carbon road bike with Sram Red Groupset. I'm starting to do some proper hill rides but I'm a big chap (not fat might I add!) and I'm struggling on the current gear setup - which is 34-50 at the front and an 11-26 at the back. I'm looking to change it to a 12-32 at the back, but do i need a new rear mech for this?



  • cycleclinic
    cycleclinic Posts: 6,865
    yes sram call it wifli -wheel building and other stuff.
  • DazzaBT
    DazzaBT Posts: 37

    Do you know what the largest rear cog can be before I need a new rear mech?
  • Monty Dog
    Monty Dog Posts: 20,614
    SRAM Red = 28 - it often depends on the dimensions of the rear mech hanger on the frame, as well as the mech itself.
    Make mine an Italian, with Campagnolo on the side..
  • Yes, you need a SRAM Wifli medium cage rear mech.

    I did the exact same switch last year, from the 11-26 to a 11-32. Changed cassette and bought a new derailleur.

    I am now looking to revert back to a closer ratio.
  • StillGoing
    StillGoing Posts: 5,211
    I fitted a Wifli Force RD and a 12-32 cassette. Got to say the jump between ratios is too big so I've reverted to a 11-28.
    I ride a bike. Doesn't make me green or a tree hugger. I drive a car too.
  • robbo2011
    robbo2011 Posts: 1,017
    I have done the same thing, but with an 11-32 cassette. I do notice the gaps but it doesn't bother me that much.

    As pretty much all of my riding is hill climbing and descending, I'll stick with it for now. It does come in handy on long days in the mountains. Ultimately though, I'd like to go back to the 11-28 when I am stronger.
  • DazzaBT
    DazzaBT Posts: 37
    If I go up to 11-28 from 11-26 - will I need a new chain?