The Schwalbe G-One RS Pro Tubeless Tire runs a semi-slick, scale-like center tread built to minimize rolling resistance on hardpack and asphalt, with recessed side knobs that stay out of the way until the bike leans into a corner. That geometry is what makes this Schwalbe's fastest gravel tire without turning it into a liability the moment the surface gets loose. Wider sizes add real volume for rougher terrain without changing what the tread itself is built to do. What Our Gearhead(R) Experts Are Saying:"I barely notice the side knobs are there on a straight hardpack stretch, and then they're exactly where I need them the instant I tip the bike into a corner. That kind of tread doesn't announce itself until the moment it actually matters."