Rolling as Part of a System - Tire Review Magazine

Rolling as Part of a System

Truck tire problems often tie to more than just 'tire problems,' in recent years.

Recently, while discussing radial truck tire performance with several seasoned industry veterans, a valid and useful point was raised. Several decades ago, many truck tire problems used to be finally diagnosed as simply that “tire problems.” This is less the case in recent years.

Tire performance is best understood and more expediently diagnosed when considered as one component of a more complete vehicle system. Sometimes, the solutions have been simple such as less positive camber, reduced toe settings and more positive caster to ensure long treadwear, good handling and to maintain vehicle oversteer/understeer characteristics when switching from bias to radial tires. Other smaller, but similar changes, helped when transitioning from standard to low profile radials.

A more current example of compatibility problems surfaced on linehaul tractors when the industry switched from three-point mount, four spring tandem drive suspensions to air rides. In this case the open lug drive tires popular with most manufacturers were re-designed to closed shoulder designs to overcome the more compliant air suspensions with lower damping levels to avoid premature irregular wear and resulting early takeoff mileages.

Several current trends are worthy of a systemic approach to overall truck vehicle performance. Single wide tires replacing dual assemblies, for example, make sense for many reasons and there is little doubt that the majority of linehaul trucks will be converted in the not too distant future. Remember that duals were originally used as a makeshift solution when the tire industry had neither the reinforcement materials nor construction technology to keep up with the rapidly escalating truck axle loads between1917 and 1925 as pneumatic tires replaced solid rubber ones. Wide singles are, however, are not necessarily a simple bolt-on changeover for many applications. Ideally, axle track width should be widened, wheels should be configured as centerline mount (zero offset) and axle camber and toe, even when designed with a straight up/down and straight ahead spec respectively, should be more closely controlled with smaller tolerances for optimum tire wear. Wider tread tires simply have greater physical displacements at the tread edges compared to narrow tread (dual) tires, resulting in increased scuff and wear for any alignment setting different from optimum. In short, wider tread tires are more susceptible to alignment related wear issues.

Tire pressure monitoring systems (TPMS) and automatic tire inflation systems (ATIS) are rapidly gaining acceptance and, to a degree, take the variable of manual PM-type pressure maintenance out of the tire durability equation.

The last piece of this puzzle is the pending development of a workable system for the full-floating drive axles that can be plumbed in a way that does not protrude beyond the outer tire sidewall. The age-old issue of determining the optimum inflation for a given load and service condition to minimize abnormal wear and to extend takeoff mileages, however,  won’t likely be solved until a variable pressure system that matches inflation to real time conditions (e.g. full load out/empty return) is developed and sold at a reasonable cost.

Many additional examples of how tires relate to other components abound. Larger front brakes, especially high horsepower absorption disc brakes, tend to slightly increase steer tire wear rates, but more importantly, reduce irregular wear. Any change from the near universal drag link type steering linkage on current Class 7 to 8 trucks can be expected to affect tire wear. Adaptations of automotive type rack and pinion or idler arm type steering can change steer tire wear. Shock absorbers and other damping devices have recently been upgraded to match air suspension requirements and more adaptation of high technology automotive devices may become future realities.

Modern radial tires often display symptoms that may, but not necessarily, indicate a pure tire deficiency. Many issues are expediently diagnosed and corrected by experienced and trained technicians using a systemic approach.

You May Also Like

Yokohama Off-Highway Tires releases new Galaxy MFS 101 forklift tire

The Galaxy MFS 101 Severe Duty Solid tire comes in 28 sizes, for rims ranging from 8- to 15 in.

GALAXY_MFS101_SDS_30

Yokohama Off-Highway Tires recently released the Galaxy MFS 101 severe duty solid tire that it says combines solid construction with a heat-dissipating design, more rubber above the 60J wear limit and a high-performance steel bead design to transfer torque with reduced slip. Yokohama Off-Highway Tires launched the MFS 101 SDS in 28 sizes, for rims ranging from 8- to 15 in.

Yokohama Launches Extreme Traction Tire for Fleets

The 907W tire, which replaces the SY767, carries the 3PMS symbol and is available now in the U.S. in three sizes.

Yokohama-Tire-907W
Continental Introduces New Valve Cap Tire Monitoring Sensor

The manufacturer said this sensor works with all of Continental’s digital tire monitoring solutions products.

COMBINE-WITH-SENSOR-Continental-Tire
Continental Launches New Tires for Medium-Duty Trucks

Continental developed the 19.5-inch General RA 2 and RD 2 tires to meet the needs of Class 4 and 5 vehicle applications.

GT Radial Team Tire Cup
Michelin Launches New Defender Tire Series for Trucks, SUVs

Michelin added two new tires to the Defender line – the M/S2 all-season and the Platinum.

michelin combo

Other Posts

Hankook Tire launches Kinergy XP all-season, grand touring tire 

The Kinergy XP is the first grand touring tire in the Kinergy line-up designed for compact, medium, and large and high-performance SUVs, as well as sedans.

Kinergy-XP_Hankook
GRI introduces new radial flotation tire, the Green XLR F88

The Green XLR F88 was specially designed and developed for slurry tankers and trailers.

GRI-F88-1400-red
Nokian Tyres releases Nordman Solstice 4 ‘value option’ all-weather tire

The 3PMSF-certified tire is available in more than 50 sizes between 15 and 20 in.

Nokian-Tyres-Nordman-Solstice-4-1400
Tips for recommending the right light truck tire

Talking to customers about LT tires starts with understanding the nuances in the segment.

Klever-AT2-1400