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Question about capacity of SRAM Rival rear derailleur

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Question about capacity of SRAM Rival rear derailleur

Old 04-11-11, 03:38 PM
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LongIslandTom
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Question about capacity of SRAM Rival rear derailleur

Currently I'm laying down specifications for my to-be-custom-built touring bike, and I figure I'd better ask and make sure before I spend the money on the parts..

Can the SRAM Rival short-cage rear derailleur work with their PG-1070 11T-32T cassette?

I saw on SRAM's website that their Rival compact double gruppo is compatible with their "WiFLi" system, which has the wide-range PG-1070 rear cassette option (11T-32T). Right then and there I thought "that 32T bailout gear would be perfect for my touring bike!"

Then I saw that there were actually two SRAM Rival rear derailleurs (short-cage and medium cage). Would the Rival short-cage work with the 11T-32T cassette?

I would be using SRAM's standard Rival compact double in the front (50T-34T chainrings).

Thanks for any help!
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Old 04-11-11, 04:03 PM
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Cage length usually has nothing to do with the largest cog the rear derailleur will clear but definitely has a bearing on how much chain it will wrap up and, therefore, on what gearing it will work with. For your planned gearing (50-34 + 34-11 = 39 total teeth) you will almost certainly need the longer cage or, possibly an MTB rear derailleur.

BTW, your planned gearing gives a 27 gear-inch low gear which is reasonably low but considered inadequate for fully loaded touring in really hilly areas. Most "real" touing bikes have low gears in the 19- 20 gear-inch range.
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Old 04-11-11, 04:36 PM
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Thanks, that's the info I was looking for. I suspected the short-cage might not have the chain-wrap capacity to take the 32T WiFli cassette. (Wish SRAM was a bit more detailed on their website about what parts go with what!)

Looks like I should consider their XX MTB rear derailleur and the MTB PG-1070 11T-36T cassette too, then. That can bring the gear-inches of my lowest gear combo down to 24.8.
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Old 04-11-11, 04:45 PM
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think twice about rival double click my freind i have it on my brand new bike and in 3000 miles or so i wont have it any more.
 
Old 04-11-11, 04:47 PM
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Won't work. You need the longer cage version.
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Old 04-11-11, 10:28 PM
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You need the "medium-cage" version of the rival derailleur for the 11-32. That was the whole point of coming out with said derailleur.

Since you haven't bought the parts yet, i'm not sure why you seem to be hesitant on using the part that was designed for that specific ridiculous gearing (11-32).
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Old 04-11-11, 11:50 PM
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Originally Posted by operator View Post
You need the "medium-cage" version of the rival derailleur for the 11-32. That was the whole point of coming out with said derailleur.

Since you haven't bought the parts yet, i'm not sure why you seem to be hesitant on using the part that was designed for that specific ridiculous gearing (11-32).
Not hesitant. I'm just in the "information-gathering" phase of planning my purchases.

Last year I heard that SRAM was bringing the WiFli option to the Rival line after successfully introducing it in the Apex line. I didn't know that they specifically developed the medium-cage Rival RD for it.

Anyway, I was wondering if I could use the WiFli 11-32T cassette with the short-cage Rival RD because I read on some of the earlier threads in this forum that short-cages do shift a tiny bit better than longer cages.

At any rate, I've narrowed my choices down to either one of the two below:

1) Rival Medium-Cage RD with the 11-32T, or..

2) XX MTB RD with an even bigger 11-36T.

I'm leaning towards the latter since this is for a touring bike after all, which does indeed need "ridiculous" gearing. (and according to Hillrider, 34T front / 32T back with 27 gear-inches isn't "ridiculous" enough for a tourer, LOL!)

Thanks everyone for helping out. I finally have a good handle on what I will need.
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Old 04-12-11, 07:35 AM
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Originally Posted by LongIslandTom View Post
Anyway, I was wondering if I could use the WiFli 11-32T cassette with the short-cage Rival RD because I read on some of the earlier threads in this forum that short-cages do shift a tiny bit better than longer cages.At any rate, I've narrowed my choices down to either one of the two below:

1) Rival Medium-Cage RD with the 11-32T, or..

2) XX MTB RD with an even bigger 11-36T.

I'm leaning towards the latter since this is for a touring bike after all, which does indeed need "ridiculous" gearing. (and according to Hillrider, 34T front / 32T back with 27 gear-inches isn't "ridiculous" enough for a tourer, LOL!)
First short cage rd don't shift significant better than long cages, they just weigh a tiny bit less and look "more professional".

Second, the "ridiculous" part of the 11x32 cassette range isn't the 32T cog but the 11T cog. If you need a 32, why would you need a 50x11 (122 gear-inch) high gear, particularly on a touring bike?
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Old 04-12-11, 08:10 AM
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The touring areas where I ride (west-of-Hudson places like the Palisades, Harriman, Bear Mountain, etc. west of New York City) have lots of roads where you get long, uninterrupted downhills and uphills.

On my current bike, the tall gearing did come in handy on the downhill roads for picking up some momentum to help zoom up the next hill.

I did a 200-mile Catskills tour for charity two years ago on my road bike (Ultegra compact double with 50-36 chainring and 12-27 cassette). The absence of a bailout gear made it hard going up hills where I can't get some momentum, but the tall gearing did help in the instances where I can zoom down a hill and up another one.

That is why I'm looking for something that will give me a bailout gear while keeping the tall 50-11 or 50-12 upper-end gearing, the next time I do that ride.
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Old 04-12-11, 08:27 AM
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I've got several hills near my house where I can hit easily 40-45 mph and I find it a lot faster to just "tuck in" and let the bike roll. The reduced wind drag is more important than the ability to pedal at those speeds. A 50x12 might be useful but an 11 is a wasted cog that could be better placed elsewhere in the cassette. An 11x32 cassette, even a 10-speed, is going to have big gaps in the intermediate cog spacing and they are more important than a super high top gear.
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Old 04-12-11, 08:33 AM
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Well.. all said; there are options.
the 110 bcd allows for a 33t. (FSA offers em thru Harris )
Combined with the 32 offers another option.
As far as the 11t.
I keep pace with a fairly fast crowd and rarely find myself into the 50t on the CF moto. (all about spinning I guess)
But..I'm waiting to 'see' where Sram pushes shimano (in this flexibility of derailleur capability)before I switch out the FSA crank /6600 derailleur and cassette.
It's beginning to look like the capacity and capability of mid cage derailleurs is going to increase.
For this rider,it's a Godsend..I can build up or buy another wheel and run a 13-32 or the 12-27(coupled with a 50/34 depending on the terrain for the days ride.
Sugino now offers a 48/32 46/28 110/74 compact double but it's priced out of sight.
Velo Orange says they're comming out with a house built compact in the same range as Suginos but priced around $119-$180
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Old 04-12-11, 11:38 AM
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Originally Posted by HillRider View Post
I've got several hills near my house where I can hit easily 40-45 mph and I find it a lot faster to just "tuck in" and let the bike roll. The reduced wind drag is more important than the ability to pedal at those speeds. A 50x12 might be useful but an 11 is a wasted cog that could be better placed elsewhere in the cassette. An 11x32 cassette, even a 10-speed, is going to have big gaps in the intermediate cog spacing and they are more important than a super high top gear.
Hi Hillrider,

I live about 100 miles west of you in PA where there are lots of hills, and almost *nothing* is flat, and I still find good uses for my 11. But more importantly, since there are so few flat stretches, the lack of one more middle cog is not a big deal. I do a lot of shifting, and never miss that "just right" middle-range cog. Anyway, in my case the wider overall range suits me better than more fine gradations in the middle.
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Old 04-12-11, 11:55 AM
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you are all idiots,

cage length has zero to do with cassette capacity, only front single double triple capacity

all sram road rear derailleurs max out at 28T

if you want to go bigger, buy a 10 speed mountain derailleur
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Old 04-12-11, 04:55 PM
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Originally Posted by 20inchesoflove View Post
you are all idiots,

cage length has zero to do with cassette capacity, only front single double triple capacity

all sram road rear derailleurs max out at 28T

if you want to go bigger, buy a 10 speed mountain derailleur
Kind of foolish to call others "idiots" when you don't have the facts straight yourself.

FYI the Rival and Apex road gruppos offer rear derailleurs that support cogs up to 32 teeth. https://www.sram.com/news/sram-rival-goes-big

WiFli option for Rival and Apex: https://www.sram.com/sram/road/technologies/255
WiFli road PG-1070 cassette with 32T option: https://www.sram.com/sram/road/produc...-1070-cassette
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Old 04-12-11, 06:04 PM
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Originally Posted by springs View Post
Hi Hillrider,
I live about 100 miles west of you in PA where there are lots of hills, .
Very interesting. I live in Pittsburgh and, AFAIK, 100 miles west of me is Ohio.
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Old 04-12-11, 06:45 PM
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Originally Posted by HillRider View Post
Very interesting. I live in Pittsburgh and, AFAIK, 100 miles west of me is Ohio.
Oops, I meant 100 miles east.....where the hills are are the flats ain't ;-)
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Old 10-06-13, 10:55 AM
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Thread necromancy,

I run 1x10 on my cross bike, with a big 11-32 cassette in the back. I have a Rival medium cage RD on there now, and it works great but it very occasionally in small cogs it will drop the chain on bouncy terrain, just because of the amount of extra chain.

Chain capacity is not an issue because there's only one chainring, the only question is the largest cog size the RD can handle.

I know SRAM says the Rival short cage RD can only handle up to 28T, but from personal experience I also know that Shimano claims 27T max for 7800 RD, but 28T works fine and I've heard reports of people running over 30T or more.

So I'm looking for personal experience. What's the biggest cog anyone has run with a Rival RD?
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Old 11-14-14, 11:03 PM
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I have the same question in mind based on experience for Rival short RD max cap..


Originally Posted by globecanvas View Post
Thread necromancy,

I run 1x10 on my cross bike, with a big 11-32 cassette in the back. I have a Rival medium cage RD on there now, and it works great but it very occasionally in small cogs it will drop the chain on bouncy terrain, just because of the amount of extra chain.

Chain capacity is not an issue because there's only one chainring, the only question is the largest cog size the RD can handle.

I know SRAM says the Rival short cage RD can only handle up to 28T, but from personal experience I also know that Shimano claims 27T max for 7800 RD, but 28T works fine and I've heard reports of people running over 30T or more.

So I'm looking for personal experience. What's the biggest cog anyone has run with a Rival RD?
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Old 11-14-14, 11:20 PM
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To the poster commenting on the SRAM double taps, I'm over 7,000 miles without issue on my Rivals.
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