Also this article below states that it is not very easy to simply bolt the new rings on the old crank, but it seems some on this forum have done it.
http://velonews.competitor.com/2012/03/ ... ity_209270
Would the non-hidden bolt chainrings mount on without the difficulty mentioned in the Velonews piece?
Also i've never swapped chainrings, do I need to pull the crank, or can I just un-bolt the old rings?
Thanks for the help.
it's not a good idea to put the new rings on old cranks:
i) the anti-jam pin will be in the wrong place, just a cosmetic issue as long as you never have an overshift, if you do then you could end up with the chain stuck hard between crank and ring, possibly damaging something
ii) you have to file down a mounting tab on the small ring to make it fit
with the pre-yaw cranks (no hidden bolt) you can easily swap rings without removing the crankset from the bike
red-black, red-yellow, or original red, all will be perfect on a pre-yaw crankset, the pin will be in the correct position behind the crank arm
look at the picture at http://www.artscyclery.com/Sram_Red_Yaw ... 130BN.html
the anti jam pin sits opposite a mounting bolt, so you are fine.
Compare that to: http://www.artscyclery.com/descpage-SRCRY53130B.html, which has the anti jam pin lined up with the hidden mounting bolt.
The Yaw rings shift very well, but are heavy. The old red black rings IMO aren't that great. Praxis shifts almost as well as yaw, but doesn't weigh as much - there's a thread on the exogram cranks that shows the weight differences.
Also, it depends on the ratios, and whether you are going compact or not. 36/52 isn't available for yaw for instance. Compact (assuming a 16T jump between rings) is going to shift worse than standard (39/53), so you might see a bigger difference in overall shifting quality.
If you want the best front shifting, go with Yaw rings on a Yaw derailleur. If you are weight conscious, go with Praxis.
If you are on a budget, with a standard front, old red might be good enough.
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