WTB Moto AM TCS Mountain Tire 26. WTB Moto AM TCS is like bringing a gun to a knife fight. This is 26 inches of quality Dual DNA rubber so your centerline tread features a firmer rubber compound for lightning fast rolling along with ridiculous durability. The side knobs are composed of softer, slower rebounding rubber so your control and grip are there for you whether you're cornering, climbing, breaking away, or bombing some nutty downhill. Plus, WTB threw in an Inner Peace sidewall reinforcement to this beefy 2.3 wide monster to keep you on the trail where you want to be.