The Schwalbe Shredda Rear Evolution Tubeless Radial Tire takes on the specific work a rear wheel handles on a steep climb, converting pedal power into forward motion instead of steering a line. Its scooping, open tread runs slightly shallower than the Shredda Front but holds a more stable shape, built to interlock with loose dirt right where the drivetrain is putting power down. A radial carcass rounds out the package with roughly 30 percent more ground contact than a standard tire at the same pressure, so the tread has more surface to actually grip when the climb turns steep and loose. What Our Gearhead(R) Experts Are Saying:"I ground through a tight, off-camber switchback climb where the rear usually breaks loose under power, and this tire just kept clawing forward instead of spinning out. That's the tread doing exactly the job it was built for, not a general-purpose knob pattern getting lucky."