Ok, I've been banging my head against the wall trying to figure out what this is. I bought a 2006 Specialized Tricross with the stock Roval wheels. I switched out the tires immediately to some Conti Ultra Gatorskin 25's. It's been creaking/popping ever since I've owned it. Thought it was the bottom bracket, so I changed that out. Nope. Changed out the rear wheel with other one from another bike and it was silent. Out of a hunch, I switched out the rear tire with the original Specialized 32. Silent. The pressure on the Specialized tire is 100 PSI and the Conti is 110 PSI. Could the tire size make that much difference? Also, from what I have found, these wheels are suppose to have a minimum of 28's, but I have had 28's on it and it creaked with them also. Think I have to stick to 32's?
Or would a better option be to leave cyclocross tires on the Roval wheels and get me a cheap set of wheels to replace them?