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When considering a plus size application for a vehicle, parameters include the Original Equipment Tire Size, Speed Rating, Load Capability, Inflation Pressures, Outside Diameter (Overall Tire Diameter), and Revolutions Per Mile, as well as the space limitations of the vehicle wheel well.
The plus size tire changeover may be for looks or for performance enhancements.
In either case, lower profile tires which have wider section widths, as well as higher performance tires, normally will increase steering response and overall cornering grip since the tire footprint shape (contact patch) is usually wider and shorter than the Original Equipment tire's contact patch.
To ensure proper vehicle operation the following guidelines may be considered in relation to the original equipment tire and wheel package:
Overall Tire Diameter
Within 2% of the original equipment fitment; Optimal is within 1 % and usually the shorter is better for stability, turning, acceleration, and braking.
Load and Inflation
Ensure the load carrying capacity for the vehicle is not reduced with the new tires and wheels. Calculate the new minimum inflation pressure to maintain the load equal to or greater than the Original Equipment tire and inform the consumer of the adjusted minimum inflation pressures.
Using equal or higher speed rated tires ensures the durability standards and performance characteristics are not diminished.
Rim Width and Offset
Ensure the rim width is within the rim range for the selected tire size. Also maintain the offset of the original equipment tire and wheel package.
Tire and Wheel Weight
The combined weight of the new tire and wheel package should be near the Original Equipment weight.
Increased weight affects the Shocks, Springs, and Brakes as well as other suspension components.
Low profile Sport Truck / SUV tires are sensitive to cracking when under-inflated or overloaded due to the low sidewall height and relatively stiffer sidewalls. During use, an over-flexed tire will often start cracking on the outer side-wall early in the tire life. It is very important to drive your car with the recommended air pressure, set by the tire manufacturer.
Any tires showing evidence of under-inflation, overloading, or are of inadequate load carrying capacity for the tires replaced will not qualify for warranty coverage. Shoulder wear and/or several lines (wrinkles) on the middle inner liner are common indications of under-inflation or overloading.
Since Plus Sized Tires and Wheels are usually wider than original, consideration must be given to wheel well space and any potential interference with suspension, chassis, or bodywork. The new tire and wheel package must have ample clearance to avoid the possibility of contacting another component of the vehicle through turns, dips, and bumps. Tire deflection, lock-to-lock steering, jounce, and rebound all must be considered.
Concern for increased weight of the wheel and tire package must focus on the performance range of the braking system. As the rim diameter increases and the tire widths increase, the weight is concentrated farther out on the lever arm in a rotational mass, which increases the stress on the brakes (or decreases their effectiveness). Also of concern is the overall weight of the tire and wheel and the effect on the braking system. Consideration must be given to upgrading the braking system to maintain braking capability within operational limits.
Since the ABS systems, ECS systems, engine management systems, speedometer, odometer, transmission shift points, speed control system, and inflation warning systems use information based on the revolutions per mile of the tire, attention must be given to maintaining a tire RPM close to the original design. Staying within 1% is optimal. Vehicle dealers should be contacted to reset the electronic codes for affected electronics.
Of special concern is any tire inflation warning system that may need recalibrating after a Plus Application. Air pressure is critical for optimum tire performance and tire safety. Clearance for the monitors within the tire cavity may also be of concern. As the air cavity reduces in height, the clearance to the monitors may be reduced and therefore may be more vulnerable to road impact damage, as well as damage during tire installation. Location (distance from the hub) may or may not affect the monitors' performance. Contact the vehicle manufacturer for clarification.
Since the shape of the tire footprint has been altered (normally shorter and wider than OE) there may be a need to modify or restrict the range of the static wheel alignment within the factory specifications. When plus sizing be aware that the new tire's footprint shape may require an alignment arrangement which minimizes scrub and/or camber thrust.
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