Low Rolling Resistance Tires
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Low Rolling Resistance Tires Tom Murphy Energy Technology & Policy December 6, 2007
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Low Rolling Resistance Tires. Tom Murphy Energy Technology & Policy December 6, 2007. Rolling Resistance. Car engine must overcome rolling friction to propel the vehicle forward — this requires fuel consumption Rolling Friction Force:. Rolling Friction Force. Normal Force (vehicle weight). - PowerPoint PPT Presentation
Transcript of Low Rolling Resistance Tires
Low Rolling Resistance Tires
Tom MurphyEnergy Technology & Policy
December 6, 2007
Rolling Resistance
Car engine must overcome rolling friction to propel the vehicle forward — this requires fuel consumption
Rolling Friction Force:
frr NCF
Type of Tire Crr
Ordinary Tire ~0.015
Typical LRR Tire <0.0105
Best LRR Tire ~0.006
Normal Force (vehicle weight)Rolling Resistance
Coefficient
Rolling Friction Force
Facts About Tires
Vehicle manufacturers usually install
LRR tires on new vehicles to help meet
CAFÉ standards more easily
Most replacement tires are not LRR
~237 million replacements sold each year
None are labeled with any indication of their
rolling resistance coefficients
Benefits
A 10% decrease in Crr can decrease fuel consumption by 1-2%
California Energy Commission estimates total gasoline use can be reduced 1.5-4.5% if all tires in use were LRR
This can be safely implemented with current technology
Questions
?
