So, here’s why the equation above makes sense. ![]() (Things are about to get a tiny bit nerdy, so feel free to skip this note if you’re not feeling it). [ Editor’s Note: Dammit Huibert, are you really not going to do the derivation on this? FINE, I’ll do it. ![]() Rturn = (Wheelbase / SIN(turn angle)) + ½ Tire Width To calculate the turn radius we need to go back to our High School trigonometry class. Powers above, was clearly more interested in the wall-to-wall turn radius of his vehicle, though. The most useful of the two radii is curb-to-curb since that is what most people will encounter in normal driving (as most front bumpers can just fly over curbs - this isn’t the case for something like a Lamborghini, of course), so that’s what we’ll focus on here. ![]() The wall-to-wall value will always be larger than the curb-to-curb value and depends on the shape and overhang of the front bumper it basically represents the smallest circle you can turn without potentially hitting something with your bumper. There are actually two turn radii that are normally calculated: curb-to-curb and wall-to-wall.
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