I am at 235 and was higher with 24 rear and a 20 front. No problems what so ever!!! I had 32 rear and it was worthless and broke spokes. The LBS owner upgraded me to these because the wheel was built better than the wheel set I had before.
I know some of you say 32 is needed. I climb so really steep inclines and do not have any problems. I have not had any problems with the Shimano wheels. Maybe I am lucky, or maybe my LBS owner knew what would work. I don't ride on smooth bike trails, I ride this on city streets and highways that are not smooth either. This bike gets a lot of abuse and the wheels are working fine.
Just my $.02, and please take it as that.
__________________
2007 Jamis Ventura Comp
2006 Jamis Explorer 2.0
2000 Specialized Hardrock (bought used)
Swim, Bike, Run and sounds like fun