[EricH]

Originally Posted by Mikyway

We're trying to design a robot that'll be thin enough to pass through the 2 ft wide ramps. So how thick do bumpers tend to be?

Bumpers are 2.5" diameter pool noodle, plus 3/4" thick plywood, plus some cloth (maybe 1/8" thick).

Remember you'll need two of those, one for each side, in your "thin robot".