I have a bizarre question. I am new to the world of cycling, and have a road bike whose tires require 100 psi. I was talking to a friend of mine who is very (auto) mechanically minded who was in disbelief that a bike tire could even take 100 psi without blowing. His reasoning was that a car tire filled that much would have exploded. Could someone enlighten me as to what allows a bike tire to be inflated with so much air pressure? Thanks!