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Features of Fuel Efficient Tyres Factors Affecting Rolling Resistance

Fuel is one of the largest costs for the Road Freight Transport When an engine powers a vehicle forward, the tyres resist this

industry, accounting for around 25% of revenue for the movement. However, the effect of this can be reduced in

industry as a whole. various ways.

With this in mind, Goodyear is committed to developing fuel-efficient technology. Low energy loss tyres are Tyres resist forward propulsion because they deflect Rolling Resistance 5
attained through advances in the following technologies. under load through their rotation cycle and Rib type tyres are better than block type tyres with
experience friction between the tread and the road
Compound Technology Optimised Tyre Casing Design surface. regards to rolling resistance, mainly due to less
movement of the tread in the contact patch area.
A high silica content compound, with a high degree of Optimising the bead area and carcass geometry This resistance causes energy loss, as energy Low-aspect ratio tyres are stiffer, allowing for less
stiffness, can lower rebound within the tread. This lowers heat generation, which in turn aids in the that could be used for forward propulsion is being flexing under load. Worn tyres have less rolling
reduces energy loss and can lower rolling resistance minimisation of energy loss. used to: resistance than new tyres. A reduction of 10% of tyre
without compromising tread wear and braking A) Overcome the deflection of the tyre’s shape. rolling resistance on a complete vehicle results in
performance. approximately 3% reduced fuel consumption (approx.
B) Overcome the friction between the tread and
Materials Technology the road surface. 0.9 litres/100km on a vehicle which consumes
30litres/100km).
Lightweight construction material, such as higher For trucks in line haul operation, there is a near
tensile strength steel grade, provides additional constant amount of engine power used to overcome Vehicle Configuration
strength at reduced mass, as lighter tyres have lower rolling resistance. In simple terms, a portion of the
rolling resistance. engine power is being used to do nothing more than On a typical prime mover and tri-axle trailer, each
assist the tyres in rotating through their cycle. axle contributes to a portion of the total vehicle tyre
Saving Money With Goodyear FuelMax
rolling resistance. To minimise the vehicle’s fuel
In 2014, a new range of FuelMax truck tyres were released in Europe. To establish the fuel economy Driving Style consumption, it is recommended to equip all axles
performance of these new tyres versus other offers available on the European market, Goodyear enlisted the with low rolling resistance fuel efficient tyres.
services of TÜV SÜD, an internationally respected independent testing organisation renowned for its The driving habits or style of the driver of a vehicle
unbiased and accurate results. can have a large influence on the amount of fuel Wheel Alignment 6
consumed. Modern automated truck drivelines can
TÜV SÜD help to reduce this influence, placing more of an Incorrect axle alignment drastically influences rolling
emphasis on the need for fuel-efficient tyres. resistance, increasing fuel consumption and causing
TÜV SÜD measures the rolling resistance of tyres in The calculations are based on a typical European accelerated tyre wear.
accordance with ISO standard 28580, which five-axle 40 tonne truck and trailer combination, with Tyre Inflation
prescribes that testing takes place on a rolling an annual mileage of 150,000 kms, a fuel Tyre rolling resistance is heavily dependent on
resistance testing drum. consumption of 34 litres/100 kms and a fuel price of inflation pressure. A 100kPa4 (14.5 psi) deviation from

The advantage of testing and assessing the fuel 1.30 Euro. the nominal inflation pressure could lead to a 5%
economy of tyres in a laboratory is that the typical Many of the latest fuel saving technologies can be difference in rolling resistance, which may result in a
factors which invalidate fuel economy comparisons found in the locally marketed range, from the significant fuel cost increase. For optimum rolling
are removed, such as variations in aerodynamic drag, FuelMax S steer tyres, to the LHDII drive tyres and resistance, it’s important to have the tyres inflated
weather, driving style and road terrain. The results Fuelmax T trailer tyres. correctly, as recommended for the respective
showed that an annual saving is achievable by using axle loads. Correct tyre Oblique tyre Non parallel tyre
the latest Goodyear FuelMax range combination While often difficult to measure, the potential benefits alignment for alignment can alignment can
compared to the next best of the competitor tyres of a fuel reduction strategy, incorporating low rolling optimal fuel increase fuel increase fuel
consumption by
consumption
consumption by
assessed. resistance tyres, are considerable. 4.5% 18.5%
4, 5, 6 Source: Goodyear Commercial Tire Systems – “Factors affecting Fuel Economy” 2008, 70086293220150

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