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PostPosted: Fri Oct 12, 2012 11:46 pm 
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Joined: Tue Jun 13, 2006 1:04 am
Posts: 28
I've been looking for a 24T chainring as an option for my XX 2x10 set up. Currently running a 39/26T front chainrings. Anyone know of aftermarket suppliers that fit the XX BCD pattern? Are these even available in cranks other than OEM offering from Specialized and Cannondale? Thanks!

PS For that matter, I can't seem to find exactly what the BCD is for the XX small ring. NOT LISTED anywhere on SRAM/TruVativ website...


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Posted: Fri Oct 12, 2012 11:46 pm 


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PostPosted: Sat Oct 13, 2012 12:19 am 
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I think the XX is 120/80 bcd


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PostPosted: Sat Oct 13, 2012 2:17 am 
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24 is too small for that bolt pattern.
Apparently Mattias Hellore can make a 25 tooth. I paid him for one and waited 6 months- he never delivered.
Finally I had to ask for a refund.
FWIW I use a Rotor 3D+ with 74/110 bolt circle and run 24/38 TA rings.


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PostPosted: Sat Oct 13, 2012 7:36 am 
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smallest you can find

http://r2-bike.com/carbon-ti-kettenblat ... -sram-xx-3


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PostPosted: Tue Oct 16, 2012 4:55 am 
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25 is the smaller you will find.


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PostPosted: Tue Oct 16, 2012 5:01 am 
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Location: Canada
Your best bet if you need a 24 would be to get a X.0 AM double 24/38 or 22/36

http://www.sram.com/truvativ/products/truvativ-x0-10-speed-crankset#/path/term-id/267

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PostPosted: Tue Oct 16, 2012 10:00 am 
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Joined: Fri Jul 25, 2008 7:18 pm
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Location: Sofia, Bulgaria
+1 on the X.0 crankset, but with spiderless rings from FRM. You can even go down to 22/36. I am running this combo since 3 months and it is lighter than XX, (around 680 grams, including the GXP bb) and shifts flawlessly.

The English version of the FRM site seems down, so here is the FRM 36T NS ring this one:
http://r2-bike.com/FRM-Kettenblatt-XGlide-NS-36.

Stefan


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PostPosted: Tue Oct 16, 2012 5:28 pm 
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Location: Insjön, SWEDEN
24T on a XX is no go as it will not be above the chainring bolt holes.

By the way EP has stopped producing chainrings, of some causes, one of them is unreliable supply of titanium chainring and cutting quotes, often end up zero profit or negative.
The other stuff is intact as it´s made in house.

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PostPosted: Tue Oct 16, 2012 6:07 pm 
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Agreed, 24 on to an 80bcd won't go. 25 will.


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PostPosted: Wed Oct 17, 2012 4:34 pm 
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Location: Finland
sstefanov wrote:
+1 on the X.0 crankset, but with spiderless rings from FRM. You can even go down to 22/36. I am running this combo since 3 months and it is lighter than XX, (around 680 grams, including the GXP bb) and shifts flawlessly.

The English version of the FRM site seems down, so here is the FRM 36T NS ring this one:
http://r2-bike.com/FRM-Kettenblatt-XGlide-NS-36" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;.

Stefan


What is the BCD for attaching the 24 ring on the 36?


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PostPosted: Wed Oct 17, 2012 7:14 pm 
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Joined: Fri Jul 25, 2008 7:18 pm
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Location: Sofia, Bulgaria
Matti wrote:

What is the BCD for attaching the 24 ring on the 36?


64mm

Stefan


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PostPosted: Fri Oct 26, 2012 6:27 am 
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Location: Covington, WA
Older SRAM XOs have a 104/64 spider (i think) that can fit 24 rings, but that would be getting a whole new crankset. And I think the X.O is a 167 Q Factor, wider than the 156 XX (unless you already have that width on your XX).

EDIT 10/26: I just ordered one of those ti 25t rings from r2bikes. If that won't do it, then a whole 'nother crank is in order.
FWIW, the difference between 25 & 24 rings with a 36t cog is about 3% in the gear-inch difference with a 29er.


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PostPosted: Sun Dec 09, 2012 9:03 pm 
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UpFromOne wrote:

EDIT 10/26: I just ordered one of those ti 25t rings from r2bikes. If that won't do it, then a whole 'nother crank is in order.
FWIW, the difference between 25 & 24 rings with a 36t cog is about 3% in the gear-inch difference with a 29er.


UFO, any update? Did this arrive?


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PostPosted: Tue Dec 11, 2012 5:19 am 
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Posts: 257
Location: Covington, WA
Oh hey, sorry i forgot about this thread, yes the 25t arrived (seattle) and bolted right on to the XX spider (80BCD).
Works great, and yes there's a difference from the stock 26t. Enough where I'm not worrying about a 24t and a whole new crank anymore.


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Posted: Tue Dec 11, 2012 5:19 am 


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