The point of contact between the bike and the ground: almost everything depends on the tires. The most demanding bikers equip themselves with different sets of tires based on the terrain they'll be racing on, the characteristics of the road, and the type of rims they use. Overcoming an obstacle without stopping or having to put a foot down is no small difference: beyond riding skill and technique, the rest is up to the tires, whose profile ensures contact with the ground and the traction needed for forward motion.
