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Old 06-01-09, 08:02 PM   #1
eogie
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Sram Rival Not Compatible with Mountain Derailleur....True?

I've only read this one place and I'm trying to find out if it's in fact true. I didn't see any contact information on Sram's website. So someone tell me, can you use use Sram Rival shifters with a mountain derailleur?

Thanks
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Old 06-02-09, 03:07 AM   #2
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not compatible. Rival is 10sp. mountain derailleur is 9sp. different cable pull per shift
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Old 06-02-09, 06:50 AM   #3
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I should have been able to figure that out.
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Old 06-02-09, 07:19 AM   #4
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Do you really think it matters to the derailleur how many gears it shifts? I'm using a road 10 speed 105 derailleur on a 9 speed drivetrain, I could use 10 speed Ultegra for that matter. The derailleur itself is not indexed, the shifters are. No reason it would not work. The overall width of the cassette and how far the dearilleur reaches or extends would determine if it would work.
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Old 06-02-09, 07:29 AM   #5
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I was asking primarily because I'd ideally like to run a mountain cassette/be able to tour with Rival. I'm GOING to figure it out.
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Old 06-02-09, 07:49 AM   #6
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The cassette is another matter, it would have to match the shifters
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Old 06-02-09, 08:04 AM   #7
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Right, but I'm thinking that I'll somehow use a very small chain ring up front and run something like a 1x10.....for touring.....we'll see.
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Old 06-02-09, 10:23 AM   #8
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IRD makes 10spd cassettes with MTB range. Now that SRAM has launched XX for MTB's, that should work as well, but at a healthy cost. The new XX rear derailleur is supposed to be cable-pull-compatible with SRAM road shifters.

An even better option for touring, particularly in your case, is to go with a Shimano bar-end and matching long cage triple Shimano rear derailleur.
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Old 06-02-09, 10:35 AM   #9
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I have a set of bar end shifters that I was going to sell but I suppose I'll hang on to them. I wonder what the new XX rear derailleur will cost....That would be oh so sweet.

Edit: It's 265.00.

http://www.mbaction.com/ME2/dirmod.a...FC9D78224A41C0
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Old 06-02-09, 10:47 AM   #10
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Can anyone comment on this little doohickie? Wouldn't this solve my problem?

http://www.jtekengineering.com/shiftmate.htm
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Old 06-02-09, 10:54 AM   #11
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Quote:
Originally Posted by Saddle Up View Post
Do you really think it matters to the derailleur how many gears it shifts? I'm using a road 10 speed 105 derailleur on a 9 speed drivetrain, I could use 10 speed Ultegra for that matter. The derailleur itself is not indexed, the shifters are. No reason it would not work. The overall width of the cassette and how far the dearilleur reaches or extends would determine if it would work.

This is true for Shimano, where mountain and road components are generally cross-compatible, but SRAM has chosen to use a 1:1 ratio in their MTB line, and a 2:1 ratio in their road line. The mountain derailleur will move twice as far per shifter click as the road derailleur if both are mated to a SRAM road shifter.

The OP may want to look into a shiftmate or a respaced cassette with a Shimano der. if he/she is bent on using Rival shifters.
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Old 06-02-09, 10:56 AM   #12
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Can anyone comment on this little doohickie? Wouldn't this solve my problem?

http://www.jtekengineering.com/shiftmate.htm
EDIT: yes, #5 shiftmate + shimano long cage derailleur + rival shifter should be good.
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Old 06-02-09, 11:11 AM   #13
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Excellent, will I be able to use a Shimano mountain derailleur? I suppose that would be a problem. Thanks.
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Old 06-02-09, 11:13 AM   #14
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Nevermind! The whole 9 spd 10 spd difference thing.....
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Old 06-02-09, 11:17 AM   #15
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Can you point me towards a rear derailleur that can accommodate a pretty large rear cog? I'm looking at the Ultegra long cage and it only goes up to 27.
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Old 06-02-09, 12:05 PM   #16
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Sounds like this might do the trick. Has a chain wrap capacity of 36 teeth.

http://aebike.com/page.cfm?action=de...=30&SKU=RD9911
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Old 06-02-09, 12:19 PM   #17
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You should be able t o use one of SRAM's 11-28 road cassettes. That's a pretty wide range.

Any road derailleur should be able to handle it. The estimates of max capacity are conservative.
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Old 06-02-09, 05:48 PM   #18
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Sounds good. I wish I would have bought the compact rival crankset rather than the standard. Makes things even trickier.
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Old 07-21-09, 09:57 PM   #19
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I think the XX looks like a fantastic option for the road. Consider the 30-45 in front with an 11-32 in back provides a top gear equivalent to a 52/12.7. That's plenty big for century-type rides: at 120 rpm this is 61 kph. Beyond this may as well coast anyway. 50 rpm @ 30/32 = 1.64 m/sec, which at a 20% grade = 1180 meters/hour, which is still a considerable effort (consider Contador climbed Verbier @ 1860 meters/hour). @ 15% it's still 885 meters/hour, around 3 W/kg. So nothing wrong with those gears on a road bike.
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Old 07-23-09, 03:15 PM   #20
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Nevermind! The whole 9 spd 10 spd difference thing.....
You can use a Shimano 9 speed derailleur with a 10 speed shifter. In fact, Shimano shifters/derailleurs are pretty much intercompatible. The issue with Sram road and mtb gear, as has been previously stated, is that the cable pull is incompatible. Thus, you cannot use a Rival shifter with an mtb rear mech without fixing that, just as you can't use a Shimano 8 speed 600 derailleur with Dura Ace 8 speed.
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Old 07-23-09, 03:32 PM   #21
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I think the XX looks like a fantastic option for the road. Consider the 30-45 in front with an 11-32 in back provides a top gear equivalent to a 52/12.7. That's plenty big for century-type rides: at 120 rpm this is 61 kph. Beyond this may as well coast anyway. 50 rpm @ 30/32 = 1.64 m/sec, which at a 20% grade = 1180 meters/hour, which is still a considerable effort (consider Contador climbed Verbier @ 1860 meters/hour). @ 15% it's still 885 meters/hour, around 3 W/kg. So nothing wrong with those gears on a road bike.
I agree, but I would use a road compact with 46t & 34t to keep cost down. Even for loaded touring a 34t Chainwheel & 32t rear cog offers low enough gearing.

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Old 07-23-09, 03:39 PM   #22
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Can you use STI shifters with a top pull MTB FD?
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Old 07-23-09, 04:02 PM   #23
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If they are Shimano then yes.
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Old 07-23-09, 04:03 PM   #24
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If they are Shimano then yes.
*Muhahahahhaha*
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Old 07-25-09, 12:01 PM   #25
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Hypothetically you can, but I've heard of a lot of people having issues with mountain front derailleurs and getting the indexing "just so" with STI levers.

Now if you're using a bar end, which is friction, it doesn't even matter.

Basically all of this crap kind of sucks, and shifters are expensive. I'm going 1x9 with a kelly take-off on my cross bike this season, I think. KISS.
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