How to Change a Wheel Faster and (Almost) Painlessly

If you ever got caught with a flat—how about that—you know how much it sucks to jack up your car, especially in the middle of a storm, which is when these things usually happen.

 Here's a simple way of jacking up your car with the standard jack using a battery drill. Save time and effort when changing wheels.

New honeycomb tire is 'bulletproof'

Posted by Mark Rutherford

The University of Wisconsin-Madison and a Wausau, Wis., company have come up with a 37-inch, bullet and bomb-proof Humvee tire based on a polymeric web so cool looking there's no need for hub caps.

Resilient Technologies and Wisconsin-Madison's Polymer Engineering Center are creating a "non-pneumatic tire" (no air required) that will support the weight of add-on armor, survive an IED attack, and still make a 50 mph getaway. It's basically a round honeycomb wrapped with a thick, black tread.

The military wants an alternative to the current Humvee "run flat" tires, which despite the name, still need a minimal amount of air pressure to roll and can leave troops stranded after being shot or blown out.

"You see reports all the time of troops who were injured by an IED or their convoys got stranded because their tires were shot out," said Resilient's General Manager Mike Veih. "There's all sorts of armor on the vehicle, but if you're running in the theater and get your tire shot out, what have you got? You've got a bunch of armor in the middle of a field."

In developing the design, the Wisconsin team studied other airless tires, like the Michelin "Tweel," but in the end settled on lessons learned from nature.

The patent-pending design mimics the precise, six-sided cell pattern found in a honeycomb and best duplicates the "ride feel" of pneumatic tires, according to the developers.

"The goal was to reduce the variation in the stiffness of the tire, to make it transmit loads uniformly and become more homogenous," said mechanical engineering professor Tim Osswald. "And the best design, as nature gives it to us, is really the honeycomb."

This particular geometry also does a great job of reducing noise and heat levels while rolling-two common problems with past models.

Costs per tire are expected to be the same or less than current units. Delivery is anticipated for 2011.

Mark Rutherford is a West Coast-based freelance writer. He is a member of the CNET Blog Network, and is not an employee of CNET. Email him at markr@milapp.com. Disclosure.

Old tires make new roads

Those tires on your wheels may end up on your roads, thanks to a more than $325,000 effort to divert 21,000 waste tires from California landfills and use them to create rubberized asphalt concrete, according to the California Integrated Waste Management Board.

The waste board awarded the money last week to El Cerrito up north in Contra Costa County and Baldwin Park.

Rubberized asphalt concrete is made by blending rubber from recycled waste tires with asphalt and uses about 2,000 waste tires for ever lane mile paved. Not only does it cut down in noise, but it resists cracking, retains its original color and can save up to $50,000 per lane mile compared with the standard 4-inch thick layer of regular asphalt.

So far the waste board has provided more than $25 million in such grants to find new uses for the roughly 42 million waste tires generated each year in California. About 75% are recycled, but roughly 10 million tires remain and are often found in landfills or illegal stockpiles. These surplus tires can be breeding grounds for mosquitoes, rodents and other pests, according to the board. They also can pose a high fire risk, and these fires are not only hard to put out but they also create heavy smoke and toxic runoff.

Money for these grants come from the $1.75 recycling fee charged on each new tire sold in California. The waste board receives $1 for each tire, and the rest of the money is used for tire-related air emission programs.

-- Tami Abdollah

Photo: Michael Conroy / Associated Press