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a DH'rs attempt at a 2x10-help plz

demo 9

demo 9

Turbo Monkey
Jan 31, 2007
5,910
46
north jersey
Building an uprising, and recovering from a knee rebuild, so i am a bit weak at the moment. I also live in an area that while not having super long climbs, has incredible steep climbs, most of them are on pavement to the trails. (house at the bottom of a small mountain)

I used to ride a trance, with a 32T single ring, and a 36 1st gear.

Now on the bigger bike, i would like to go with a 2 by 10. I would have to run a 30t ring or less, which i will outspin easliy on some of the descents. therefore, i would like to run a 28/36

1st, i have been looking around, and unable to find many companies that sell chainrings, and they have to be shifting chainrings i believe.

2nd, I plan to use an E13 TRX chainguide, so ideally, i will get the maximum amount of teeth that the 36T version can hold, the tighter the chain to the roller, the less likely the chance for the chain to drop off the rings. The Descents here get very rough, so i think that its a big task for the guide, especially if its a small granny gear.

3rd. if nobody directly makes a 28/36 pairing, can i mix and match? Is there a special ratio that forces me to use one of the already "set" pairings companies offer?

help plz :(
 
4130biker

4130biker

PM me about Tantrum Cycles!
May 24, 2007
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I think you can use whatever combo you want, as long as the jumps between rings doesn't exceed the derailleurs capacity. Ramped on your big ring will shift the best.
In my experience, you should be able to get away with a triple or double specific front derailleur.
I was just briefly poking around for shift ramp 36 ring, and it's hard to find! Edit: looks like shimano sells a ramped 36t that you can get by itself.
Good luck man!
 
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Da Peach

Da Peach

Outwitted by a rodent
Jul 2, 2002
13,683
4,912
North Van
I had a 38t ramped RF ring. No idea why I had one, but they exist.

I now ride a 24t/32t with an 11-36 2x10 sprocket and all is well. Lots of redundant gears, but I've got the ones I need.
 
lockstock

lockstock

Monkey
Mar 6, 2007
110
0
No need to have a ramped granny ring in my experience, was running a middleburn 28t granny off CRC without issue.
 
Sandwich

Sandwich

Pig my fish!
Staff member
May 23, 2002
21,073
5,986
borcester rhymes
Shimano makes a 36t middle ring, at least for slx. Might be 9 speed, not sure if that matters. I might sell mine to go 1x, if you want it.
 
mtg

mtg

Green with Envy
Sep 21, 2009
1,862
1,604
Denver, CO
You can get shifting rings from a handful of companies. Here's two options that I know of off-hand:

Race Face Turbine rings. They list the available combos and BCD mounting. 104/64 is the standard 3x mount, and 120/80 is 2x10 specific. Choose whichever fits your cranks.

And, e13 makes rings as well. They advertise these as being designed to work with the guide you're going to run. These are 104/64 BCD only, it appears.

If you're running the same cranks that had the 32T single ring, I would almost guarantee that you have 104/64 BCD.
 
MinorThreat

MinorThreat

Turbo Monkey
Nov 15, 2005
1,630
41
Nine Mile Falls, WA
My SB66 came 3x10 (yeah, I know . . . that's how Yeti spec'd the base 'Enduro' build) that I converted to 2x10. Our climbs around here can get rather steep, so I was wanting a somewhat-but-not-too-tall granny. I settled on a 38/26 combo. Got the 26 cheap enough and it's just about perfect for everything but uber stump-puller climbs. As noted above, ramped 36, 38, etc 104/4 rings are not plentiful and kinda pricey; and I wanted to be sure on the 38 before I spent good money. So I tried my not-too-abused 38t FSA DH ring (no ramps/pins/nada) and . . . whataya know? - - it shifts just fine. I'm sure it would be like butter with a proper ramped ring; but the jump from the 26 isn't so great that the derailleur and ring can't handle it. I was pretty surprised.
 
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4130biker

4130biker

PM me about Tantrum Cycles!
May 24, 2007
3,884
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MinorThreat said:
My SB66 came 3x10 (yeah, I know . . . that's how Yeti spec'd the base 'Enduro' build) that I converted to 2x10. Our climbs around here can get rather steep, so I was wanting a somewhat-but-not-too-tall granny. I settled on a 38/26 combo. Got the 26 cheap enough and it's just about perfect for everything but uber stump-puller climbs. As noted above, ramped 36, 38, etc 104/4 rings are not plentiful and kinda pricey; and I wanted to be sure on the 38 before I spent good money. So I tried my not-too-abused 38t FSA DH ring (no ramps/pins/nada) and . . . whataya know? - - it shifts just fine. I'm sure it would be like butter with a proper ramped ring; but the jump from the 26 isn't so great that the derailleur and ring can't handle it. I was pretty surprised.
Click to expand...
I've had the same experience with an old black spire DH ring that I used to run as a double. Not as precise or quick, but it does work!
 
bizutch

bizutch

Delicate CUSTOM flower
Dec 11, 2001
15,928
24
Over your shoulder whispering
I've got a RaceFace 24/36 combo on my bike in 9 speed.

I've never bothered to ask if I want to run 10 speed in the future, do I have to change front rings? Going from 8 to 9 speed rear you didn't? Somebody educate me. :thumb:
 
RoboDonkey713

RoboDonkey713

Monkey
Feb 24, 2011
678
462
Maine
demo 9 said:
Do the 2 rings both have to match? Can i run lets say a shimano granny and raceface middle?
Click to expand...
Should Be fine. I ran a 36t RF ring w/ a XTR 24t granny all summer. Worked fine. The Race Face rings work well and are very reasonably priced but they do not last very long. 3 months on mine and the teeth were sharked tooth shaped
 
4130biker

4130biker

PM me about Tantrum Cycles!
May 24, 2007
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demo 9 said:
Do the 2 rings both have to match? Can i run lets say a shimano granny and raceface middle?
Click to expand...
Most (if not all) granny rings I've seen don't even have ramps, so I think you're good with most combos as long as they fit your cranks.
 
stoney

stoney

Part of the unwashed, middle-American horde
Jul 26, 2006
21,613
7,271
Colorado
You can do a 14th jump for front rings. It's almost impossible to find a 24th ring though. a 22/36 combo is sufficient for most needs though.
 
T

tabletop84

Monkey
Nov 12, 2011
891
15
stoney said:
You can do a 14th jump for front rings. It's almost impossible to find a 24th ring though. a 22/36 combo is sufficient for most needs though.
Click to expand...
yep that's what I run too and if you don't have to win races you outpedal the 36 ring just when no pedal strokes are needed and the 22 comes in handy when it gets really steep. Some people say you can walk instead of pealling 22/36 but I feel that pealing is better for my stamina than getting off and on the bike and walking the bike constantly.
 
J

JRogers

talks too much
Mar 19, 2002
3,785
1
Claremont, CA
stoney said:
You can do a 14th jump for front rings. It's almost impossible to find a 24th ring though. a 22/36 combo is sufficient for most needs though.
Click to expand...
No, it should be fairly easy to find a 24t ring. Shimano, Race Face and others make them. I think it is the standard size for Shimano mountain triples now.
 
4130biker

4130biker

PM me about Tantrum Cycles!
May 24, 2007
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450
Yeah mines a 24t tuvativ. Never seen a 28 granny ring, but I wouldn't be suprised if its out there.
 
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