My weight fluctuates (during the seasons) from about 155 to 180.. Now I'm not very worried about weight, I doubt I'd even notice it on my kilo. But these two rims are probably what I'm deciding on since scrod kinda talked me outta the B43.

What I'm really worried about is that the roads I ride on, the routes that I take, it's not the best. The way I commute has a lot of bumps, cracks, and just typically crap roads. I do take my bike everywhere though, I just want to know the main differences between the two for my purposes and weight. Do you think M13's would be perfectly fine or I should stay with heavier rims for the roads and my weight..