Well, it's not necessarily the case that the problem is in the bike. I've seen speculation as to left-side tire wear and why it sometimes happens - to begin with, if a lot of time is spent riding in cities, you're riding twice as long turning left than right. Every time you turn right at a crossroads, you are in the right position to just turn, but when turning left you have to cross the entire intersection and drive a much longer distance to get across. You also take left turns at greater speed. Left-side tire wear isn't unusual on a number of bikes that have never been down. So not necessary to jump to "the frame is twisted like a pretzel" yet.
Does the bike see a lot of city street riding? That could explain both the overly large wear (lots of snappy starts at the red lights) and the left-side increased wear. Just speculating.
And how's your tire pressure? If it's too low, a heavy torque monster like the R3 will eat the tire in short order.