Sram Derailleur compatibility.

[Salty Seadog]

I need to replace my sram derailleur on the Montpellier. It has flat bar therefore trigger shifters. I have looked at the sram apex derailleur but this is a road mech. Both it and the mech it is replacing use sram exact actuation which gives a 1:1 pull ratio.

Is it likely to work here or will I need a mtb specific mech?.

TIA.

[Brucey]

safest option is to get another (X-series?) MTB mech with a similar number of speeds. You don't say how may you have, which makes it difficult to help you.

The Apex (10s) rear mech, although it is called '1:1' exact etc appears to have a different shift ratio to the 7/8/9s stuff (which isn't 1:1 exactly either), judging from the measurements on this page

https://en.wikibooks.org/wiki/Bicycles/Maintenance_and_Repair/Gear-changing_Dimensions

worth looking at this page too

http://blog.artscyclery.com/science-behind-the-magic/science-behind-the-magic-drivetrain-compatibility/

cheers

[Mud-Plugger]

It used to be an SRAM Rival 11 speed long cage on the Montpellier.

This one?

http://www.chainreactioncycles.com/sram ... prod136599

[Salty Seadog]

Brucey It is a 10 speed cassette so I am replacing a 10 speed mech.

Mud plugger, mine is a 2014 Montpellier, the components are sram via GT. A groupset they only used for a couple of years.

[Brucey]

10s sram road or mountain should work provided there is enough capacity

cheers

[Salty Seadog]

10s sram road or mountain should work provided there is enough capacity

cheers

Many thanks.