Soon, `airless` tyres that can withstand rough terrain

Off-road vehicle specialist Polaris plans to debut a consumer version of an "airless" Non-Pneumatic Tire (NPT) by early next year.

Washington: Motorists will be relieved to hear that they will be spared from the cumbersome task of filling air into their tyres regularly, as off-road vehicle specialist Polaris plans to debut a consumer version of an "airless" Non-Pneumatic Tire (NPT) by early next year.

Made from a proprietary plastic, the NPT replaces the conventional tire carcass with a flexible web.

"The tire works very similar to a bicycle wheel, where the load is carried in tension across the top of the wheel," Fox News quoted Polaris spokesperson Jason Difuccia as saying.

The bottom of the wheel is designed to give in to obstacles like rocks, curbs, and other terrain.

That means - no punctures in the wilderness, and no need to carry a tire repair kit.

The NPT was originally developed by a small Wisconsin-based startup called Resilient Technologies, which was acquired by Polaris last year.

Seeing it in operation is nothing short of astounding - the tire rolls over sharp rocks, poking tree branches, and harmful tree stumps without a problem.

The NPT has three main components - the web structure, an outer rubber tread band, and a solid inner steel rim mounted to the axle.

Polaris said that the open design means dirt, tree branches, and gravel will shift and fall out as you ride, rather than getting stuck inside.

But preventing flats isn`t the NPTs only advantage over conventional rubber.

For new riders, the company said that the airless tire absorbs impacts without the typical jarring bounce of a pneumatic tire.

That means a safer, more sure-footed ride even over tough, dangerous terrain and quicker response to steering inputs.

To make sure the NPT can withstand long-term abuse, it was put through military-grade testing.

Engineers shot test tires with 50-caliber rounds from an AK-47 and then subjected them to 5,000 hours of off-roading.

On another outing that involved crossing a train tracks, a rail spike punctured the tread band of an NPT, but the rider kept going on it for more than 1,000 miles.

The NPT is also quieter than a typical tire, which emanates a loud noise when used on pavement, its air-filled cavity acting almost like an amplifying speaker.