Schwalbe Big Ben RaceGuard MTB Tyre - 26 x 2.15 (559 - 55)Schwalbe Big Ben RaceGuard MTB Tyre 26 x 2. 15 (559 55) Boasting RaceGuard technology for puncture protection you can rely on, low rolling resistance and comfort on rougher terrain, Schwalbe brings you its Big Ben MTB Tyre. Ready for all surface types, it's even E Bike compatible to withstand the extra torque from bikes with powerful electric motor assistance. RaceGuard: Puncture protection level 4; A double layer of nylon fabric. Good protection for