[dichotomous]

I fully agree that the forces on the rims for bikes and cars are very different, but the wheels for the weight need to be similar. there is less lateral loading on a bike tire, becuse the bike puts lateral load on a tire backwards compared to a car. at speed you push the bars opposite the way you turn, and the lateral forces are acting against the radii differences between the two tires at an angle. so you are pushing the trailing edge of the tire into the turn which is much easier than pushing the leading edge into the turn as with a car.

But if your worried about the lateral forces on the swingarm, I wouldnt be. because the rear is gonna wanna roll more than push. and if you want extra insurance on it, get either a supersport rear arm(WICKED beefy triangulated deal designed to resist twisting while "backing it in" under full power (3x what the metro has) and sliding sideways then regaining grip at 150mph.... I think it might be strong enough to resist the light end of a metro going 45mph around a turn) or get a touring/cruiser rear arm setup, those bikes weigh 700lbs pretty easily, are made entirely from steel, and all the weight is sitting on the rear wheel.