Join Date: Dec 2004
Location: Middle of da Mitten
Bikes: Trek 7500, RANS V-Rex, Optima Baron, Velokraft NoCom, M-5 Carbon Highracer, homebuilt recumbent
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Just trying to save you some hassles. What you might consider doing is look at your current system and see if it's possible to only buy one of the greenspeed idlers. If it looks doable, just replace the power side pulley, since it's the one making the most noise right now.
BTW, the greenspeed idler uses the same 8mm (5/16") bolt. I guess the first-first thing you need to do is see what size bolt the Burley uses. RANS uses rollerblade bearings, which are smaller. I've found my V-Rex makes a little chain noise under high loads, but I can live with it. The RANS idlers have held up well so far - the bearings were replaced at 20K miles but the idlers themselves are still going strong.