Anybody run a 1:1 actuation ratio rear derailluer with a dt/barcon friction shifter?
I'm considering getting a SRAM X9 derailleur for a touring build, but the 1:1 actuation ratio concerns me.
I've read in other posts that the derailleur might not be able to move through the entire cassette with a friction shifter. Has anybody successfully run a set-up like this?
If it is a concern, I'll go with a Deore XT , but I'd like to get SRAM a try if it's an option.
Question is WHY? 1:1 stuff is MTB is it not? adopting a brake cable travel multiplier,
aka travel agent may be a kludge.
As is adopting trekking bars so you can use the whole SRAM MTB set.
the more likely to work is the latter ..
Regarding 1:1 cable pull ratio for SRAM mtb and road groups, no, 1:1 is not just for their mtb components. From the SRAM website: "When we launched our road technology from scratch we reapplied our MTB proven SRAM 1:1 actuation ratio (shifter cable travel : derailleur movement) for 10 speed rear shifting."
Originally Posted by fietsbob
To the OP, sorry, I can't answer your question, I've never used a friction shifter with a SRAM 1:1 rear derailleur.
Last edited by well biked; 03-28-11 at 12:46 PM.
Insane Bicycle Mechanic
There's been a couple people who have done this on the Bentrideronline forum. It requires a Travel Agent to get enough cable pull and you'll have to use friction shifting (no indexing), but it's do-able.
Originally Posted by Pukeskywalker
If you're thinking bar-ends or thumbies, either of the TT shifters will suffice. Pauls has the thumbie mounts. I haven't seen any downtube fitments yet.
True Friction shifters like Sachs Huret are "dumb". That is they have no notion about indexing or ratios. Just pull or push and they should work cause all they do is tighten or slacken the tension on the rear d spring. I have never run a setup like sram, but my LBS guy tells me that I can frankenbike my bike with a campy rear and a shimaNO front.
I am dragging up this old thread because I am trying to find a definitive answer to this. Most people say that a friction shifter wont work with sram because of the 1:1 ratio, while others say it will, but I have yet to find anyone who has actually tried it. I would like to find someone who has actually tried using a friction sifter with SRAM who can confirm whether it does or does not work.
The problem with most friction shifters used with SRAM 1:1 derailleurs is that they will not wrap up enough cable to traverse the rear derailleur over the entire width of the cassette. The SRAM derailleur requires a lot more cable pull than Shimano or Campy rd's to move the same distance. So the friction shifters should shift ok but only over the range they will actually move the derailleur.
Andrew R Stewart
Use a travel Agent or a Jtek adaptor to get enough cable movement. Andy.
Insane Bicycle Mechanic
As I said above, it was done (with a Travel Agent) by one of the folks on the Bentrideronline forums. A search on "SRAM friction shifter" there should find the culprit pretty quickly.
Originally Posted by Seijun
All true - the only question is, will the shifter lever pull enough cable to make the rear mech traverse the entire 10-speed cassette?
Originally Posted by I_like_cereal