Originally Posted by
FBinNY
Many commuters, including myself use large section tires to make us more carefree about the condition of our local streets. That's fine, but you need to keep in mind that the pressure stress on the rim is proportional to both the tire pressure and the tire section. The same pressure in a tire twice as wide causes double the stress on the rim flange.
+1
I learned the hard way that just because a 1.9" tire is rated for 75psi, doesn't mean the rim can handle it.
The first rim (Mavic) lasted a year before the sidewall cracked.
The second (identical) rim lasted a month before the sidewall cracked.