E thirteen trs race mtb tyrese thirteen trs race mtb tyres are purpose built enduro tyres engineered to maximise traction in extreme conditions at race speeds their tread pattern features an aggressive tread design with a structural angled base on the side knobs to control roll under high speed cornering sipes are positioned to provide confident transitions from straight lines to cornering and confident braking traction ramped shorter centre knobs keep trs tyres rolling surprisingly fast f