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Kevlar ®
From WikiPedalia
A very strong artificial fiber, used in bullet-proof vests and bicycle tires. Kevlar is used in tires two different ways, for two different purposes:
- Kevlar beads are used on some high performance tires. Replacing the normal wire bead with Kevlar saves about 50 grams per tire. Kevlar-bead tires have the additional advantage of being foldable, making them popular as emergency spare tires with touring cyclists. Kevlar-bead tires are somewhat harder to mount on a rim, and are more likely to blow off than wire-bead tires. They work best on "hook edge" rims.
- Kevlar-belted tires have a layer of Kevlar under the tread surface, with the purpose of making the tire more resistant to punctures caused by small. sharp objects, such as thorns and glass slivers. Kevlar-belted tires have slightly higher rolling resistance, price and weight than corresponding tires without the belt.
