Although there is no air pressure that riders can adjust, they can instead adjust the rubber-tensioning rods to make the wheels run harder or softer
A thin sidewall may be added, to keep out mud and trail debris
The mountain bike version of the Energy Return Wheel, being put to the test
The automotive version of the Energy Return Wheel
A cut-way view of the automotive version of the Energy Return Wheel
Puncture-proof tires that incorporate a flexible internal matrix instead of air are nothing new, in and of themselves. In the past several years, we’ve seen prototypes from the likes of Michelin, Amerityre, Goodyear and Bridgestone. Colorado-based Britek Tire and Rubber has also been developing something similar, known as the Energy Return Wheel. While the ERW is intended mainly for cars, the company recently released a video showing a prototype set of the wheels in use – on a mountain bike.
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