Originally Posted by
Darth_Firebolt
You CAN go that small, but the ride will be harsh and you'll probably get more flats. I would say at your size not to go much smaller than 1.75, especially if you're worried about your wheels taking a beating.
I concur. There is very little advantage in using narrower tires.
If you do want to use narrower tires, though, that is your choice. The only general rule of thumb is avoid tires narrower than your rims, so that likely means 1.5" or more.