SRAM road gears

Noclue
Noclue Posts: 503
edited February 2008 in Workshop
Could anyone tell me if SRAM road gears use a 1:1 actuation ratio the same as their mountain bike gears do and also confirm that Shimano is 2:1 and what about Campag? Cheers.
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Comments

  • acorn_user
    acorn_user Posts: 1,137
    They are similiar, but IIRC not the same. Specifically, Sram road shifters are not compatible with Sram mtb derailleurs. I think Campagnolo uses 2:1 actuation, but the pull is not the same.

    Are you planning a touring bike with road shifters? Your best option might be to pair Shimano STI with Shimano mtb gears, or Campagnolo Ergos with the Shimano mtb stuff and a Shiftmate or similar.
  • gundersen
    gundersen Posts: 586
    And why on earth would he use "Campagnolo Ergo shifters with the Shimano MTB stuff"???????????

    Just wondering.
  • PHcp
    PHcp Posts: 2,748
    gundersen wrote:
    And why on earth would he use "Campagnolo Ergo shifters with the Shimano MTB stuff"???????????

    Just wondering.


    I do. Along with loads of others.
    Advantages of the Ergos;
    Non indexed front mech
    Cables that don't get in the way of a bar bag
    Serviceable
    Cheaper
    And personal preference of hoods

    Advantages of the Shimano rear end;
    Lower gears
    Stronger 135mm hub
    Cheaper
  • gundersen
    gundersen Posts: 586
    ok

    but campagnolo have also rear mechs with long cages - but sadly no modern 135 mm hubs.
  • aracer
    aracer Posts: 1,649
    AFAIK Hope and Tune will do 135mm Campag hubs if you're so inclined.
  • ynyswen24
    ynyswen24 Posts: 703
    The Sram road shifters seem to use the same 1:1 actuation as the Sram MTB sets but wouldn't be compatible, it seems to me, due to the narrowness of a 10 spd cahin compared with a 9 spd chain on the MtB sets (just as with any 10 v 9spd road system).
    Shimano and campag both use 2:1 actuations but, as I understand it, have flaot to compensate for any minor errors in set up, component wear etc in different places - Shimano in the top floating jockey wheel and Camapg in the shifter itself, thats why you can use shimano rear end parts with cmapg shifters much better than the other way round. One way you get plenty of margin for any variables, the other way you get very little if any.
  • ynyswen24
    ynyswen24 Posts: 703
    my typing is terrible, I do apologise
  • aracer
    aracer Posts: 1,649
    How on earth do you put float in the shifter?
  • ynyswen24
    ynyswen24 Posts: 703
    Not sure if thats right but thats how I remember it from ages ago when the question came up in an LBS I used to frequent. I'm not going to take my ergo levers apart any time soon to find out either...
  • aracer
    aracer Posts: 1,649
    I think you (or your LBS) are getting confused between shifting and braking - the quick release for the brakes is at the levers on Campag and at the calipers on Shimano, hence Shimano levers and Campag calipers results in no QR.

    "float" in a shifter would be better described as "slop", and I'm fairly convinced Campag shifters don't have an excess of that!

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