The Ground Control Sport uses an extremely versatile tread pattern which can be used from cross country race to trail, it rolls fast with exceptional amounts of confidence and grip. Our Block-In-Block design uses a taller adaptable inner block to pierce the ground and claw for traction. The larger outer structure supports the inner block for additional speed, traction, support and stable handling. Casing: 60 TPI. Bead: Wire. 26 x 2.35", PSI 25-50, approximate weight 730g. 27.5 x 2.35", PSI 25-50, approximate weight 830g. 29 x 2.35", PSI 25-50, approximate weight 890g.