@CNN: This mountain biker just conquered the legendary Streif course in Kitzbuhel — considered to be the toughest downhill race in Alpine skiing. How? He attached 15mm long spikes to his tyres. https://t.co/2SbWBKvwd8 via @cnnsport https://t.co/WePmFshrzX

@CNN: This mountain biker just conquered the legendary Streif course in Kitzbuhel — considered to be the toughest downhill race in Alpine skiing. How? He attached 15mm long spikes to his tyres. https://t.co/2SbWBKvwd8 via @cnnsport https://t.co/WePmFshrzX