>>1195975Shaq's current bike is made by a company called Dirty-Sixer (so named because the wheels are thirty-six inches.) He is probably very near your weight in pic at right; he was reportedly 370lbs when he left the NBA and is now probably what you are: just under 400lbs. (Also, he's 7'1" and you're 6'6"--dude, you're fat.)
The Dirty-Sixer is probably very expensive, but probably less than buying a bike, breaking it, then buying another. Building the frame around that wheel size makes it proportional to your body size and reportedly Shaq loves it because of that.
An MTB in the largest size, like a 65cm, should work, though. Then take it to a wheelbuilder who knows what they're doing (there are a lot of horror stories about clueless bike shop mechanics, so be wary) and have them get the wheels perfectly trued and tensioned before you ride. The wheels on a new bike were machine-assembled to the tolerances of the average rider and cannot be trusted at your weight. Put the fattest tires that will fit between your frame and fork on them, ride them near max pressure. If the wheels hold, great. If they still fuck up, that's probably only because the rims and spokes are cheap. Re-investing in a set of nice quality, strong wheels, properly tensioned, I think would hold. I really have no way of knowing, but those 36 wheels on Shaq's bike don't look like they have a lot of extra spokes, and smaller 26" or 29" wheels should be stronger? I'd go 29" since the proportions will be less awkward for you.
You might need to buy a longer seatpost and a longer, taller stem, too. And I wouldn't do any actual hardcore off-roading on it, obv.