Specialized redesigned its XC tire lineup around two new casings, and the Fast Trak Flex Lite is the version that goes all-in on weight savings for race day. The optimized tread and Flex Lite casing drop 55g from the previous generation while adding 18% more puncture and cut resistance compared to the outgoing S-Works casing. If your race calendar rewards outright speed and you're willing to pick clean lines instead of plowing through chunder, this is the casing option in the range that leans hardest toward pace.

The tread splits duties between two rubber compounds to keep the tire fast without giving up cornering confidence. A low-resistance T5 center tread boosts straight-line speed by 5%, while Block-In-Block shoulder knobs use the grippier T7 compound for traction and control at high cornering speeds. The reduced knob height across the center strip is what makes the tire feel quick off the line, and the block-in-block shoulder design acts like siping to add mechanical grip when you lean the bike over into loose corners.

Casing choice is the real decision with this tire. The 60 TPI Flex Lite construction is Specialized's lightest XC casing, which means it prioritizes suppleness and acceleration over sidewall armor. Specialized also engineered the Control wheels and Fast Trak tires as a seamless duo, requiring 50% more force to pinch flat than the previous generation, so pairing the tire with a matched wheelset gets you additional flat protection from the system rather than the tire alone.... Read More