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Roadie levers and Mountain Drivetrain?

Dethklok

Monkey
Jul 4, 2008
149
0
Rochester, NY
Ok so I have not really found an actual answer for this set up. Im considering creating a monstercross kinda bike but leaning way more towards mountain (XC, and general trail riding nothing crazy aggressive or DHish) than cross. I wanna run gears, a 2x10 SRAM Mountain set up but with SRAM roadie shifters.

Now some have mentioned the issue of indexing difference, ie: SRAM road levers will have too little or too much pull if I hook it up to a mountain front derailler?

I have also seen there are issues with the roadies running much larger chainrings up front than mountain, so that may cause front derailler issues? biggest SRAM offers for mtb is 28-42, well the XX can come in a 30-45, but thats still a substantial tooth difference then the smallest road rings.

Now I think I may be a little screwed since Im basing this off a newer specialized and it has the whole new S3 Direct Mount for the front derailler, I was kinda thinking if it was a clamp-on I could just kinda slide it up or down once I figured out the indexing but Im SOL

Anyone have any insight or experiance with this? Im gonna keep it all SRAM btw if that makes a difference, maybe it will all work fine or indexing will be the same? Could I just run a Cross Crankset + FD and choose a rear cassette based on that for mountain? (and will cross cranks hold up to trail riding) Im am so lost as to figuring this out and I really dont want to start this project and then end up either buying a few groupsets or having it forced to be just another mountain bike.
 

moff_quigley

Why don't you have a seat over there?
Jan 27, 2005
4,402
2
Poseurville
If I remember right sram mtb/roadie groups are not cross compatible. Pretty sure you could do what you are talking about with 9sp Shimano stuff though.
 

Banshee Rider

Turbo Monkey
Jul 31, 2003
1,452
10
If I remember right sram mtb/roadie groups are not cross compatible. Pretty sure you could do what you are talking about with 9sp Shimano stuff though.
SRAM Road/MTB groups (10spd) are compatable. I've confirmed this with SRAM for customers doing hill climb races who want to run 36T cassettes.

I'm not sure on the front derailleur, but I don't forsee any reason you'd run into problems running a MTB front derailleur if it's all 10spd. (Crank included) Shouldn't matter if it's Shimano or SRAM, it doesn't with their road front derailleurs atleast. Shimano makes a better front derailleur in my experience.
 

-dustin

boring
Jun 10, 2002
7,155
1
austin
I have set up a few Red + XX Rd + 11/36 cassettes. It's compatible.

I would buy whatever cranks you want and the appropriate FD. Crank will be dependent upon the frame (mtn or road) and FD will be dependent upon that (mtn or road).