All:

I bought a 2013 Rockhopper Comp to get back into biking after a couple decades. I've been struggling with making it fit for a few months, and finally decided that since I'm doing 90% of my riding on the road, I wanted to get some higher pressure tires so it would roll faster.

LBS said Infinity Armadillos would work fine at 100 psi. Not that I don't trust them, but I also contacted the official Specialized support staff, who told me these rims would absolutely not support 100 psi.

So instead of pouring more money into my MTB to try and make it a 90% road bike, I decided to buy something else. I landed on a Salsa Vaya, as it seemed great for the kind of riding I want to do, without prohibiting me from hitting a gravel road, if I want.

This has DT Swiss 470 rims, which are rated only to 58 psi, despite having tires which are rated for 90 psi.

Salsa says 58 is the right number, and not to exceed that.

My question is, what happens to a rim if that pressure is exceeded? And finally, are there any recommendations for a decent rim that will fit up to 35-38mm tires, and has a higher max psi? Or am I chasing my tail here?

And in case it makes a difference, I am quite heavy, at 280. I just want something that will roll well, so I can cover longer distances. Right now, I can only do about 25 miles on my MTB until I'm done.

Thanks!