Low rolling resistance tire

Low rolling resistance tires designate tires that have a reduced rolling resistance.

This is achieved by the following measures:

  • Use of special rubber compounds
  • Lower height of the carcass
  • Radial reinforcement ( radial tires )
  • Use of special profiles or smooth treads
  • Reduced tire weight
  • No or special hose
  • Height of the rim flange ( on a bicycle )

Depending on the application, other measures for achieving the lightweight run most effectively. The application limits for tires are determined by:

  • Axle load
  • Speed
  • Road conditions

Savings

The differences with the same tire size of up to 30 percent for the same sections. Off-road tires through their profiles gröberstolligen much higher rolling resistance. This has the following reductions in consumption can be achieved with petrol engines powered cars (MS PowerPoint, 743 kB )

  • City traffic 4-6%
  • Out of town 3-5%
  • Highway 2-3%

For electric vehicles, and low-energy vehicles is significantly greater reductions in consumption between 15% yield to 50 %.

In the field of bicycles rolling resistance can vary even more, because there are larger type and pressure sheath (eg, three times ).

Rubber compound

A lower rolling resistance is achieved by specific silica and silica - silane compounds in place of carbon black -based carbon black tire compounds. Thus, the adhesion properties can be improved under wet conditions or reduced with the same adhesive properties of the rolling resistance.

Belt

The belt is the supporting structure. The carcass can be characterized by the threads per inch.

Mass

Especially with bicycle tires carbon fibers are held wire inserts used to save weight. For heavier vehicles, however, the reduction in rolling friction thanks to this measure is relatively low.

Cross-section ( tire height rim diameter ) by tire width

At lower tire flexing in the tire walls is lower. For scooters or scooter tires, elliptical cross-sections have been established in which, despite low tire height a good damping results.

Treads

Although lots profile tires have lower friction coefficients, but lower rolling resistance. For wider bicycle tires without profile treads are used.

Hose

With bicycle tire tube is rubbed with talcum powder or coated therewith at the factory to reduce the friction. Latex inner tubes have rubber ( inner pressure tube thickness) under otherwise identical conditions a lower rolling resistance than those made of butyl rubber.

Policies

2003 entered into California law in force to promote low rolling resistance tires. By 2007 standards by the California Energy Commission ( CEC) have been developed that are in July 2008 ( instead of the planned 2006) come into force. The CEC has resigned in recording methods for manufacturers of tires for light trucks for their rolling resistance and developed evaluation criteria for fuel economy by the tires. The classification of tires with respect to the rolling resistance will then be noted on the tire itself. Investigations of the German Federal Environment Agency have shown a positive correlation between rolling resistance and braking distance or risk of aquaplaning (MS PowerPoint, 743 kB)

Others

The tire width and diameter contribute through increased contact patch on the road to running or rolling resistance, moreover, the air resistance of the vehicle. Wide tires or enlarged by larger wheels increase ground clearance in both cases, the cross-sectional area.

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