Just MHO, but I'd think pedaling up a 20" wide ramp could be tough. I'm assuming there's some sort of railing on one side or the other. Take 12" of the ramp so you don't hit your bars. That leaves about 8" for the wheels. Assume some weaving as a rider pedals, and there's a 6"+ramp surface drop-off. I'd probably walk the steps and roll the bike; it's not much easier than picking the bike up and lifting it up three steps.