I have a Cannondale T2000 Touring bike that was purchased early this year. The wheelset that came on the bike consisted of DT Swiss 7.1 rims, DT 14ga spokes in a 36h, 3 cross pattern with Cannondale Wind hubs. I am a clydesdale rider, weighing in at 275lbs. About 2 months after the bike purchase and about 500 miles, the bearings in the rear hub failed when I was climbing a short hill and standing on the pedals. There was no cargo other than my own big self, and the initial crack and subsequent constant clicking and wobbly rear wheel forced me to pull over and begin my long walk home. My LBS ordered and replaced the bearings with no squabble at all. Unfortunately, the same thing happened again about a month ago. I explained to the salesman (who is also the owner of the shop) that I was pretty perplexed over this happening again - after all, I bought a bike that was built to handle a load. After a call to Cannondale, he explained that a new replacement wheelset would be forthcoming. I have been a good customer over the last three years and have bought many bikes for me and my family, so I was excited to hear that a new wheelset was on the way. My concern is that the replacement wheelset is Mavic Open Pro rims, 36h rear and 32h front, with a 3 cross pattern using 12ga spokes on Ultegra hubs. Obviously, a great wheelset. But the concern is that I run 35mm Schwalbe Marathon Plus tires. Aren't these tires way too big for that rim? I've always heard that one shouldn't run anything bigger than a 28 on a standard road rim. Should I indeed be concerned?