X0 2x10 22/36 and 24/38 chainring availability?

[CHSAD]

Ideally why can't sram just offer 38-24 and 36-22 aftermarket chainrings and w/o the bash? It seems that even with the spider they are no only offering the GXP w/bash, not even bb30.

[coldryder]

CHSAD,

I can't answer your question as to why SRAM cannot offer the different size 2X chainrings w/o bashguard but I have found another company that offers them for the XO.

The Italian company FRM has its NS Chainrings that come in a kit with 36/22 chainrings (spider is part of the 36t ring) and four male/female/spacer bolts. I received mine in the mail today and will mounting and test riding this set up tomorrow.



Note that in my photo, the large chainring looks somewhat grainy. That is because I have a low quality camera. The actual piece is a nice, smooth satin black color.

[Bhorium]

That looks like a good option. If they only will offer them in 24/38 configuration also, I would be a happy man.

[coldryder]

Bhorium,

Agreed. FRM definetly offers 24/38 rings but they may only be compatible with FRM's own crankset. If the rings I just purchased end up shifting well and being sturdy, I will probably look in to whether FRM's 24/38 rings will work on the XO crankset.

[Bhorium]

Yes, please post your impression after testing them. Just sent FRM a mail if they will offer the same type of rings in 24/38 configuration in the near future. Will post their reply here.

[coldryder]

So the FRM 36/22 rings were easy to install. As per the pictures above, the spider is part of the 36 ring and this ring is made to attach to the XO cranks via the three bolts, just like the XO spider does. The 22 ring attaches to the 36 ring with four standard male/female chainring bolts and the included spacers are placed between the rings.

Both the 36 and 22 rings have a 64mm BCD, which suggests that one could use any 64mm BCD ring in place of the 22 ring. The 36 ring, obviously, is proprietary as it has been machined to interface with the XO cranks.

Here is a picture of the new chainrings mounted on my bike.


I rode for about an hour yesterday and another hour and a half today. I was purposely careful with my shifting to start with, making sure I didn't shift the front under hard pedaling, etc. After a while, I forgot about that and just shifted without thinking about it. The rings shift perfectly. The only difference which I could discern from the XO rings was that the shifting might have been a tad slower. However, this may have been just because I was giving more thought to the shifting than usual. By the end of today's ride I was no longer aware that the shifting was slower.

I think these rings are a good option if you are looking for a 36/22 chainring combo for your XO crankset and don't want or need a bashguard. I think I will buy a 64mm BCD 24 inner ring and see how that works because the 22 may be a bit small for my needs.

Another note... both rings are aluminum and the whole set up is quite light. The crankset now weighs 100gm less than it did in 39/26 confirguration. I also removed one whole link from the bike's chain. Another reason to go with a different inner ring is that a steel ring may wear better than FRM's aluminum ring.

[Bhorium]

Good review coldryder.
Got a reply from FRM the other day, and they won't be offering the 24/38 option in the near future. Said that the demand isn't big enough.

But found some other chainrings from a German site: 24 teeth and 38 teeth. Will these just bolt on with no worries if I have the new XO crank with the 22/36 setup? Do I need some other hardware too?

[coldryder]

Bhorium,

I am not if you are asking whether the chainrings in your links will work if you have the 120/80BCD XO crank with the FRM conervsion, or whether they will work if you have the new for 2012 XO that comes in 36/22.

[skidad]

Originally Posted by Bhorium

I've ordered a new bike, a Grand Canyon 29 AL 9.9 SL (can't post link due to not enough posts, but their site is: canyon.com) that comes with a S2210 crankset with 22/36 chainrings, but would like to change them with a 24/38 set. Is it only available with the bashguard option? If so, will this in any way affect the chainline or cause problems for me? (Since from my understanding this is actually a 3 ring set up with the bash in place for the biggest ring).
Not 100% sure if it is a 36 or 38 teeth specific FD, but was told that I could mount a 38 ring, but no bigger. Will a 36 teeth specific work with a 38 chainring or vice versa? Or are there other direct mount FD that maybe is fitted?

New bike I'm getting has the 26/39 XO crank that's never gonna see a pedal stroke. Gonna go right to the 24/38 kit. I called Sram and was told the conversion kit is only available right now with the bash guard. Even the rings are not available by themselves yet. The guy said the spider is specific with a 49mm chain line (I have a GXP BB if that matters). All you can do is try the FD that comes on that bike to see if it will work (nothing to lose really) and they said you could use a 38T so go for it. Worst case you need a new FD. He recommended I use the dedicated new FD for the slightly different chain line but from reading other posts here it seems the one that will come on the bike will be fine. I would have assumed going from a 2 x 10 to another 2 x 10 the chain line would be the same?? Jeez this stuff is confusing at times.

[paulcd]

I just found a useful manual on the SRAM website called "Frame Fit Specifications" which can be found by clicking the Service title at the top. It is listed a couple of times under Quick Find. On page 16 it shows the distance between the rings for the 22/36 and 26/39 is the same but 0.5mm offset (which seems pretty insignificant). There is front derailleuer information earlier in the manual too.

[Bhorium]

Originally Posted by coldryder

Bhorium,

I am not if you are asking whether the chainrings in your links will work if you have the 120/80BCD XO crank with the FRM conervsion, or whether they will work if you have the new for 2012 XO that comes in 36/22.

I was asking if it would work on the new 2012 X.O that comes in 36/22. I want to replace these with a 24/38 set up, but don't wanna buy the version from Sram with the bashguard.
Can I just unbolt the two chainrings from the spider, and install new ones?

[paulcd]

Originally Posted by Bhorium

I was asking if it would work on the new 2012 X.O that comes in 36/22. I want to replace these with a 24/38 set up, but don't wanna buy the version from Sram with the bashguard.
Can I just unbolt the two chainrings from the spider, and install new ones?

I can't see an X.0 crankset in 36/22 that comes without a bashguard on the UniversalCycles website. Are you looking at bike that has one fitted already?

[Bhorium]

Yes, I'm buying a bike with the 22/36 already installed, but want to replace them with 24/38 rings. So I would like to know if I can just unbolt the rings from the spider, then install new ones. Or are one of the rings part of the spider?

[skidad]

Originally Posted by Bhorium

Yes, I'm buying a bike with the 22/36 already installed, but want to replace them with 24/38 rings. So I would like to know if I can just unbolt the rings from the spider, then install new ones. Or are one of the rings part of the spider?

All I know is they better be able to be removed (and I assume they are) because I'd be really pissed if I had to buy a new spider every time I needed to replace that ring. Sram couldn't be that stupid (greedy)...or could they? Have you not looked at the bike you're getting with the 22/36 to answer your own question?

The 24/36/bash I want won't be available from QBP until early Feb (my LBS gets his stuff through them). so I'm interested in this answer. Also the new Sram rings are not available seperately yet. Std. bolt spacing though so other available rings should work I assume.

[paulcd]

Bhorium - what bike have you got?

The chainrings look removable. Why don't you e-mail UniversalCycles for some info?

[skidad]

Ok, it now looks like the XO spider/24/38/bash kit wont be available until near the end of March according to QBP

The X9 kit is available now. Anyone know if it fits the XO crank arm?

[craigstr]

I read they were the same

[MTB Pilot]

Originally Posted by skidad

Ok, it now looks like the XO spider/24/38/bash kit wont be available until near the end of March according to QBP

The X9 kit is available now. Anyone know if it fits the XO crank arm?

They are available here...

Universal Cycles -- Sram XO & X.9 Chainring Sets with Guard (GXP)

MTBP

[skidad]

Originally Posted by MTB Pilot

They are available here...

Universal Cycles -- Sram XO & X.9 Chainring Sets with Guard (GXP)

MTBP

Nice find, thanks MTB pilot! Guess I didn't look to hard and now I have a slight dilemma. My dealer who I bought the new bike from is gonna give me a smoking deal on the kit but he gets his stuff from QBP and the XO is more than a month and a half out but they do have the X9 kit available.

The price between the 2 is not much and maybe the difference is a carbon guard on the XO kit and aluminum guard on the X9 kit? I'd prefer the aluminum anyway. I'll call Sram tomorrow and get the answer unless someone here knows for sure. Now the 2012 Specialized 29'r Test Bike I had for 3 days did have one of these new setups and the guard was indeed aluminum.

[craigstr]

From what I read in this thread somewhere, the XO is a bit lighter and has more shift pins.

[skidad]

Originally Posted by craigstr

From what I read in this thread somewhere, the XO is a bit lighter and has more shift pins.

Hmmm, I must have missed that or more likely in my case forgot I'll see what Sram tells me tomorrow and post back.

[Vancemac]

I'm a bit confused (not uncommon). My Scalpel 29 came with SRAM s2210 cranks, 39x26. They are BCD, so if I wanted to, I should be able to just replace the 26t with a 24t BCD chainring, yes? Is the sticking point the 39 to 24 gap? Would I need to go down to 38t for the x9 derailleur?

[paulcd]

Looking at a picture of the Scalpel 29 Pro, the BCD appears to be 120/80 (as opposed to 104/64 - the end of the spider arms is very close to the chain). The BCD should be printed on the chainring too. I believe that 39 and 26 are the smallest chainrings you can fit on the 120/80 spider so assuming that it would fit on your crank, you'd need to go with an X9/X0 chainring set (link in the post #118 above).

[coldryder]

Originally Posted by Vancemac

I'm a bit confused (not uncommon). My Scalpel 29 came with SRAM s2210 cranks, 39x26. They are BCD, so if I wanted to, I should be able to just replace the 26t with a 24t BCD chainring, yes? Is the sticking point the 39 to 24 gap? Would I need to go down to 38t for the x9 derailleur?

Not exactly. I think you are missunderstanding the term BCD. BCD is the acronym for Bolt Circle Diameter and by itself, is not a size. It is usually paired with a number to indicate the size of a chainring in terms of the chainring's compatibility with the crank/spider.

Chainrings are also sized by the number of teeth each has. But number of teeth and BCD are completely seperate and independant variables. There are a few standard Bolt Circle Diameters. The orginal 2X10 SRAM XX and XO chainrings have a 120(outer)/80(inner) BCD. The 120/80 BCD is unique to SRAM 10 speed mountain chainrings.

So, the replace the 26 tooth small chainring on your SRAM s2210 crankset, you will need to find a 24 tooth chainring with the same Bolt Circle Diameter (aka, BCD) as the 26 tooth. If the SRAM s2210 crankset uses the 120/80 BCD, you will need an 80 BCD 24 tooth chainring. However, as noted above, there may well be no such thing as an 80 BCD 24 tooth chainring as the bolt circle diamter of a 24 tooth ring cannot be 80. Usually rings that small have a traditional mountain inner BCD of 64.
I hope that helps.

[Bhorium]

Originally Posted by paulcd

Bhorium - what bike have you got?

The chainrings look removable. Why don't you e-mail UniversalCycles for some info?

Sorry for the late reply.
The bike I have ordered is this. Won't be delivered before week 15, so have no opportunity to check it out.