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  • 40 tooth outer chainring with shift pins, ramps etc – Help please?
  • Vortexracing
    Full Member

    Fancy trying a 40t outer on my triple chainset, anybody know where I can get one. All the ones I can find tend to be without shift pins and ramps.

    It's for a XT770 crankset 104BCD. Is it an unusual size, the smallest pinned and ramped ones seem to be 42?

    More importantly do the pins and ramps make a big difference? I have only ever run ramped and pinned ones so I don't have a clue what amount of difference having them makes.

    Ta

    Chuck

    Posted 13 years ago
    toppers3933
    Free Member

    try a middleburn slick shift. think they do them in a 104pcd 40t.

    Posted 13 years ago
    toppers3933
    Free Member

    just out of interest why do you want to run a 40t?

    Posted 13 years ago
    Vortexracing
    Full Member

    tried middleburn and they only do 42.

    Running a 44 at the moment and tend to be either at the top end of the block on the 44 or at the bottom end on my 32 middle. (which it tends to drop the chain a bit)

    Just thought a 40 would give me a decent chain tension to try and stop dropping the chain and not be on the big ring at the front and the big at the rear.

    Maybe a 42 will suffice?

    probably need to look at the ratios which I have not done yet 😳

    Posted 13 years ago
    keavo
    Free Member

    i use a ta chinook 40t middle ring in the big ring position on an xt triple chainset. from sjscycles about £40

    Posted 13 years ago
    RobHilton
    Free Member

    Clee Cycles stock TA Chainrings in tons of sizes

    Posted 13 years ago
    Chisel
    Free Member

    Keavo does the 40T fit okay with standard bolts as much like Vortex i'd be keen to try a smaller big ring.

    Posted 13 years ago
    keavo
    Free Member

    the ta 40t middle fits o.k. but its not quite perfect. the ring is a little loose where it bolts on to the crank spider. once the bolts are in and tightened its o.k. it shouldn't move….mine hasn't anyway. also the front mech needs to stay at about the same height as if you had a 44t on, if you move it down it will catch the 32t ring.

    Posted 13 years ago
    njee20
    Free Member

    The 32 – 40 won't be a very good shift, would recommend just doing a 2×9 set up and going for 26/40 or something.

    Posted 13 years ago
    keavo
    Free Member

    32 to 40 is a great shift, fast and quiet.

    Posted 13 years ago
    Gee76
    Free Member

    Double and bash!!!!.

    36 outer means ya only drop the 44 x 11 & the 44 x 12 or 13. Tho you know this as I ramble on about it every week 😉

    We'll work on getting rid of that granny ring laters 🙂

    Posted 13 years ago
    keavo
    Free Member

    40t is good on 29er, 44t is too big even on a race bike. i've tried 2×9 but concluded that if i'm going to have a mech and shifter i might as well have 3 rings. a 30t middle would be better too.

    Posted 13 years ago
    thisisnotaspoon
    Free Member

    DMR make (well, more likely import form tiawan) them IIRC, they certaily doa 38t which i'm considdering, the 36t steel shimano one is doing the job nicely at the moment though.

    Posted 13 years ago
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