Originally Posted by
Landgolier
I have RD's they are round as hell, and that's with the stock ring, not even something nice like a TA. Runout tolerance on cranks has gotten a lot tighter than it used to be, and chainrings are better than they've ever been. Also, 55x22 may be more gear than a single normal track chain can handle. No biggie, you can join two, but it may be a problem.
I have an RD w/ 48t chainring, and it's very eccentric / uneven - there is a noticable jump as the chain goes around. I have had several more experienced people look at it, and they told me that that's definitely the problem, and that it's somewhat common w/ the RDs. Maybe the newer ones are a little better, but I'm definitely not using an RD on my next build. My gf has one with a slightly smaller chainring and hers is Ok.