Xtrada 6 27.5" The Xtrada 6 is designed for riders who want to ride on a variety of terrain. The super lightweight 6061 hydroformed aluminum ALX frame uses heat-treated, hydroformed and tapered tubing to achieve an optimal strength-to-weight ratio. The tapered head tube provides stable precision at the front end and the new Boost hub spacing on this frame allows for a stiffer wheel with more tire clearance. The Boost system also allows for shorter chainstays, making the back of the bike much easier to turn around corners. The Xtrada 6 utilizes Polygon's new Wheel Fit Size System, where each fr...