Sram/Dura-Ace compatibility?

oldskoolkool
oldskoolkool Posts: 86
edited November 2008 in Workshop
Has anybody tried SRAM shifters with a DURA-ACE 7800 rear mech? I like the double tap system but don't want to have to change to a SRAM mech.

Comments

  • James_London
    James_London Posts: 530
    The cable pull is different so this combination won't shift at all well.
  • oldskoolkool
    oldskoolkool Posts: 86
    Does anyone know the different cable pull ratios for both?
  • ynyswen24
    ynyswen24 Posts: 703
    They won't work together at all. The Sram pulls 1:1, same amount of cable pulle at the lever as the rear mech travels up or down or sideways at thge cassette. Shimano and Campag both move twice as much at the back as at the front. The Shimano system has to have much bigger springs to overcome the discrepancy, Sram will have much lighter springs and consequently can cope much better with other wear and tear in the system as a whole (wonky cable tension, worn bushings, old chain etc).
    The Sram is a development of the off-road X series gears.
  • aracer
    aracer Posts: 1,649
    ynyswen24 wrote:
    They won't work together at all. The Sram pulls 1:1, same amount of cable pulle at the lever as the rear mech travels up or down or sideways at thge cassette.
    Almost true. The ratio of the off-road X series is close to 1:1, but not quite exactly. Meanwhile the road series has a different pull ratio to the off-road stuff (which is a definte retrograde step IMHO), so less than 1:1, but still more than Shimano or Campag.

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