Quote:
Originally Posted by Thenorm
just noticed this post.
a larger diameter tire actually has worse mechanical advantage when driving over a bump. the lever arm is longer, so it take more torque to do the work.
i'm not sure all the math, but my physics professor did this exact example in class once, and I've remembered it to this day.
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No, you are mixing up the reference point, your cars motor is not driving you up the crack the weight of the car rolling along does.
So yes a larger tire will roll more easily over a crack when being "pushed" than a smaller tire.
Try pushing a hand cart with small tires over uneven terraign and then one with larger and you will see what he is talking about.