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Greg Martin, a 37-year-old firefighter from Ketchum, Idaho, won the single-speed division (and came in fifth overall) in the 24 Hours of Adrenalin Solo World Championship on a bike that didn't have a chain. It used a smooth, silent, carbon-polyurethane belt.<br>
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The system offers a number of benefits over the 150-year-old chain. It's lighter; doesn't use grease; requires no maintenance; won't break, stretch, rust or fall off; and, best of all, it offers a pronounced improvement in "engagement" -- the millisecond it takes for the bike to react to your pedaling forces.

Look, Ma -- no chains

( Spot Bikes )

Greg Martin, a 37-year-old firefighter from Ketchum, Idaho, won the single-speed division (and came in fifth overall) in the 24 Hours of Adrenalin Solo World Championship on a bike that didn't have a chain. It used a smooth, silent, carbon-polyurethane belt.

The system offers a number of benefits over the 150-year-old chain. It's lighter; doesn't use grease; requires no maintenance; won't break, stretch, rust or fall off; and, best of all, it offers a pronounced improvement in "engagement" -- the millisecond it takes for the bike to react to your pedaling forces.

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