Patent ID: 8393367

Claim:
An energy efficient wheel product comprising: a multi-chambered pneumatic tire fixed to and rotating with a wheel hub about a wheel axis; the tire comprising: a hollow non-porous outer ring encircling the wheel hub and being radially spaced apart from the wheel hub; the outer ring comprising: at least one high-pressure chamber; the at least one high-pressure chamber encircling the wheel hub within the outer ring; the outer ring being fixed to the hub by a first non-porous sidewall and by a second non-porous sidewall, the sidewalls being axially spaced apart; the outer ring, first and second sidewalls, and wheel hub enclosing a low pressure chamber; the outer ring being restrained radially to the wheel hub by at least one ring restraint band; the at least one ring restraint band encircling the hub within the low pressure chamber, the at least one ring restraint band being substantially inelastic; the outer ring contacting a rolling surface.