Long cage RD/12-36 question
02-06-13, 11:02 PM
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Long cage RD/12-36 question
I had been thinking of putting SRAM Apex group on my Gunnar Sport (lots of hills here) which now has 105/Ultegra components on it. I recently read online where riders have put a long cage derailleur like Shimano XTR and a Shimano XTR 12-34 cassette to do same as Apex. Anyone here have this experience? Love to hear from you if you did. Thanks all.
-Paul
(sorry, title should read 12-34)
-Paul
(sorry, title should read 12-34)
Last edited by PCR; 02-06-13 at 11:06 PM.
02-06-13, 11:33 PM
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I have done that on several bikes using Shimano MD-771 RD, which is high normal. It works like a charm. Other RD models work too but I don't know the numbers. Be sure and get high normal RD though.
02-06-13, 11:38 PM
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I have a cheap 12-34 and Shimano mountain derailleur that I swap in on my Ultegra triple bike when the really steep stuff is on the docket. Works great. BillyDonn is right -- watch that you get a high normal derailleur.
02-07-13, 12:16 AM
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You can't use current-generation XTR rear derailleurs together with road shifters. XTR is "dyna-sys", which means that the cable pull ratio is wrong. You have to get an old RD (2009 or older?) or modern low-level (Deore). You can, however, get a modern cassette, those are still the same.
If you can live with the 32 low gear, many if not most frame/road RD combos can be tuned to handle 32. For 34 and up, I think you need to get a mountain RD.
If you can live with the 32 low gear, many if not most frame/road RD combos can be tuned to handle 32. For 34 and up, I think you need to get a mountain RD.
02-07-13, 02:57 AM
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What's a 'high normal' RD?
I sometimes swap in a SRAM MTB RD with my Force groupset. With SRAM all 10 speed is compatible.
I sometimes swap in a SRAM MTB RD with my Force groupset. With SRAM all 10 speed is compatible.
02-07-13, 06:52 AM
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Low normal means the return springs on the derailleur bring it to the low (large) cogs on the cassette. Some mountain cassettes are this way so it's easier to dump a bunch of gears going into a sudden ascent. If you were to use one of these it would reverse the way your rear shifter works.
02-07-13, 08:49 AM
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https://www.jensonusa.com/!AMAzF5jxmz...tm_medium=ppcI put the long cage LX M581 on one of my road bike. Shifting is very accurate and smooth if properly adjusted. Pay attention to proper chain length and b-tensioner screw. You want to use the shortest chain plus one whole link. Adjust the b-tensioner screw so that the upper guide pulley is as close as possible to all the rear sprockets without touching.
02-07-13, 12:46 PM
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I'm not sure if SRAM and Shimano shifters and derailleurs are interchangeable. If your bike is 10sp the latest Shimano 105 mid-cage (GS) derailleur is officially rated for a 32T low gear. You can typically go 1-2T past this without issue so a 12-34 cassette can be made to work. With newer road groups accepting wider range cassettes you no longer need to run MTB gear just to get lower climbing gears.
Last edited by Dunbar; 02-07-13 at 12:51 PM.
02-07-13, 02:29 PM
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I've got an XTR M972 with an XT 11-34 on my Roubaix. I was coming from a hybrid with an 11-36. One of the things I like about doing this option is that if I can't get strong enough to keep moving down (I'd like to eventually be able to do a cassette that will work on a Di2 drivetrain) I can also go to an 11-36 on this setup as well.
02-07-13, 03:31 PM
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The other option is the RD-M591, the cheaper version of the M771.
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02-07-13, 04:20 PM
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I wonder if the Shadow types generally don't shift as smoothly in road applications. My M972 is a little rough, but the M971 was pretty much gone everywhere. Shimano told my shop to use the M972 instead.
Last edited by JakiChan; 02-07-13 at 05:55 PM.
02-07-13, 06:25 PM
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The above mentioned RD's seem to be 9 speed, any particular model for 10 speed?
Thanks for all the great info guys, I appreciate your time and expertise.
Thanks for all the great info guys, I appreciate your time and expertise.
Last edited by PCR; 02-07-13 at 06:30 PM.
02-07-13, 07:12 PM
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You'll need the 9 speed RD as they have the correct cable pull for the 10 speed brifters. The new 10 speed mountain RD is not compatible with 10 speed road brifters.
02-07-13, 07:38 PM
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On my road bike, I use a Shimano Deore with a 9-speed 12-36 cassette and it works great.
02-07-13, 08:39 PM
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02-08-13, 07:02 AM
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Shimano makes the T661 rd which is sold in Europe as part of a "touring" group. It is more or less an LX level part. May look a little nicer on a road bike than the more readily available Deore. Works well for me with an 11-34. You can find them on ebay or from the UK sellers.
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