Am I too heavy for my Trek 7200 multitrack? I was wondering if I'm too heavy for my bike. I'm about 260lbs (118kg). I keep getting flats.
Being too heavy and getting too many flats may be separate issues... On one hand, weight will always seem to increase the rate of flats, as I have discovered by going cross country with 60 pounds strapped to my rear rack.

On the other hand, as long as you are not popping spokes, you are not "too heavy" for your bike.

To phrase this another way, this is not a bike issue, it's a tube-popping issue. If you're getting too many flats, make sure you're running the correct pressures, and maybe get some thorn resistant tires and or tubes.