Big D- Riding a $100 solid-frame mountain bike from Academy at 280 lbs, I went off road twice and had to buy a new rear wheel each time- so that's the first lesson, stay on the road and off the "mountain". Gears and brakes gradually got out of whack and couldn't hardly be gotten back into whack. Anyway, at that price, if it was half a fit, I'd probably ride till I decided I didn't ever want to ride a bicycle again or until I wanted something better.
The quicker that one falls apart, the easier it will be for your wife to see why a $75 bike is not a good idea.
