From Wikipedia, the free encyclopedia
Non-pneumatic tires (NPT), or Airless tires, are tires that are not supported by air pressure. They are used on some small vehicles such as riding lawn mowers and motorized golf carts. They are also used on heavy equipment such as backhoes, which are required to operate on sites such as building demolition, where tire puncture is likely. Tires composed of closed-cell polyurethane foam are also made for bicycles and wheelchairs. The main advantage of airless tires is that they cannot go flat, but they are far less common than air filled tires.
Airless tires generally have higher rolling resistance and provide much less suspension than similarly shaped and sized pneumatic tires. Other problems for airless tires include dissipating the heat buildup that occurs when they are driven. Airless tires are often filled with compressed polymers (plastic), rather than air.
Michelin is currently developing an integrated tire and wheel combination, the "Tweel" (derived from "tire" and "wheel," which, as the name "Tweel" suggests, are combined into one new, fused part), that operates entirely without air. Michelin claims its "Tweel" has load carrying, shock absorbing, and handling characteristics that compare favorably to conventional pneumatic tires. Automotive engineering group of mechanical engineering department at Clemson University is developing a low energy loss airless tire with Michelin through the NIST ATP project.
Resilient Technologies and the University of Wisconsin--Madison's Polymer Engineering Center are creating a "non-pneumatic tire", which is basically a round polymeric honeycomb wrapped with a thick, black tread. The initial version of the tire is for the Humvee and is expected to be available in 2011.
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pewag tire/tyre protection chains in hot slag operation
pewag tire/tyre protection chains
Very high temperatures, liquid steel slag, large and solid scrap pieces,
concrete driveways, etc. mean toughest working conditions. pewag's
successful answer: reinforced, highly wear resistant and customized chain
The Best Burnout EVER!!!!
$300.00 special catching HELL!!! At the 2011 Burnout party!!!
This vehicle was bought to finish the show with a bang!! This was done in
front of the house on a PRIVATE road and IF YOU DON'T WANT TO SEE A BURNOUT
DON'T CLICK THIS LINK!!! And don't ask WHY?? If you want to see pics of the
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Real Man's 4WD Track
A Land Rover Defender drives up a "Real Man's" 4WD track.
One brave soul attempted it in a Landcruiser but failed before even getting
both sets of wheels on the ramp. He is currently at home trying to fix his
The video was taken at the Maitland 4WD & Camping Show 2009 and the
ramp is 5.5M above the ground.
The majority of the drive is done with the driver seeing nothing but sky.