SCHWALBE SMART SAM 27.5 x 2.25 650B ADDIX TYRENo easy challenge for Schwalbes senior developer. The result, however, is outstanding. The tread of the Smart Sam is modern and balanced at the same time. The compact central rib provides comfortable rolling; the edged outer lugs guarantee optimized off road grip. For this reason Smart Sam is reliable in every condition and even rolls well on roads.