[Brad23]

I'm useing a SRAM X.0 rear derailer. I'm having problems with my current setup and looking for advise. The rear d over stretches or the chain is too loose and the rear d folds back on itself.

Thanks, Brad

 

[Toshi]

what front rings are you running? what range cassette in the rear? long cage derailleur? what kind of frame? is it a bullit, or similar design with a bunch of chain growth?

 

[Brad23]

Front rings are 36/22 rear cassette is 34-11, bike is a turner RFX, not much growth

 

[TheMontashu]

your chain mite be to long

 

[punkassean]

Sounds like you might need a long-cage derail. You have a pretty wide spread both up front and in back...

When you installed your chain how did you determine the length? Or did you just put it on w/o removing any links?

 

[joelsman]

shift your bike so it is in the biggest front ring and largest rear cog, the lower pulley should be further forward than the upper pulley, angle between pulleys and level should be 45 degrees or flatter. take the spring off the shock and compress to see how much the chain grows. you want just enough to be able to shift and bottom out the suspension in this gear combo.

hope this helps

 

[MikeD]

I'm running that same ring combo on the same bike with an 11-30 cassette and a sram mid-cage derailleur. Works fine. If your der. is a standard cage, you should *probably* be fine, too, if you have the proper chain length. If you have a mid-cage derailleur, you'll have to switch to a smaller cassette or a standard cage. (Or, alternately, run your chain too short and run the risk of ripping off the derailleur if you shift into the big ring-bigger cog combos...)

 

[Brad23]

I'm running that same ring combo on the same bike with an 11-30 cassette and a sram mid-cage derailleur. Works fine. If your der. is a standard cage, you should *probably* be fine, too, if you have the proper chain length.

I think it's a mid-cage, I'm thinking about a smaller cassette like yours. Some day when I'm stronger I'd like to go to a single ring, but there's a few hills I do that I need my low gearing.


(Or, alternately, run your chain too short and run the risk of ripping off the derailleur if you shift into the big ring-bigger cog combos...)

This is how it's set up now, I just don't use the three larger cogs with the big ring.

 

[MikeD]

Well, going to a shorter cassette might help you start getting stronger...but even on the RFX, I don't find any need for lower than 22-30 gearing.

I put a single ring up front on my HT (34t w 11/34 rear) and while the 1-1 ratio is fine for most climbs, even long roads, I'm just nor strong enough to use it fully when it gets really slow and technical. Lose momentum and you're done. I don't know how the singlespeed guys do it. (And I suspect that a lot of them actually don't...)

MD

 

[DßR]

I'm not sure what your problem is? Is the derailleur maxed out at both ends (big-big and small-small combos)? Or is your chain just too long in small-small?

hell, I ran that same combo (rfx, 11-34, 22-36) with a short-cage 105, just kept it out of big-big and small-small. Worked pretty well.

To get "proper" coverage though, you need a long-cage derailleur. Your spread is 37t, plus another t or so to account for chain growth. Long-cage stuff usually covers what, up to 43t, so go with that. A mid-cage XTR has a capacity of 33t, so that would not work with your setup if you wanted to use all the gears. I expect a mid-cage X.0 would be similarly capable.