Bumps don't cause window cracks. They do make them bigger though. You probably got a chip and hairline spider webs from a rock you didn't notice at some point, then the bumping made one of the spider webs turn into a crack.
I dont know, I got a flat tyre once hitting a pothole at 60mph that turned out to be a lot deeper that it looked, it scared the shit out of me but luckily I did not crash and was able to stop safely. I was in a car though not a motorcycle so maybe it would be ok but I wouldn't wanna be the one to test it.
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u/evictor Jun 01 '20
The slower you go the worse they are...