WTB Trail Boss TCS Light 27.5 Mountain Tire. The WTB Trail Boss TCS Light 27.5 mountain tire certainly lives up to its moniker when you're out on the trails. This svelte, speed merchant of a tire sports tight enough tread spacing for full on, drag free onslaughts, yet it's blocky and tall enough to really dig in when it comes time to drop out of warp drive. A rounded profile and staggered, supported side knobs keep clamoring for traction even as the trail loses its camber. Top to bottom, this tire will have you owning the trails like a boss.
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