superfly_snook
Well-Known Member
I bet the loads bike racks experience on bumpy roads are pretty significant and I would lean more towards the rack flexing and the bike moving in the rack and contacting the window. The bike is clamped in by the wheels, and the tires themselves flex and deform under loads. The bikes have suspension so they compress, and that will occur under a load such as the rack bouncing up and down. Everything to me points to the bikes hitting the glass not some random rock. Even if you think the bike can’t hit the glass by eyeballing it I would bet that rack and bike move all sorts of ways you wouldn’t have thought of doing 40mph down a bumpy dirt road.
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