The trek procaliber 97 sl hardtail mountain bike 2017 delivers uncompromising cross country performance efficiency and an incredible ride feel it39s the fastest smoothest smartest hardtail on the trail in mountain biking39s heyday procaliber was the envy of all other race bikes now it39s back to rule the xc circuit once again redefining the term ldquohardtailrdquo and setting the bar for speed and intelli