Tire Plus One & Plus Two

The plus sizing concept was designed to enhance vehicle performance by allowing the fitment of lower aspect ratio tires than originally fitted to the car when new. Plus One/Plus Two retains the overall diameter of a vehicle's existing tire & wheel assembly by increasing the wheel diameter & reducing the aspect ratio (sidewall height).

By retaining the overall diameter of the tire, the revolutions per mile remain the same. Therefore, speedometer & odometer readings, gearing & engine computers are virtually unaffected. At the same time, the driver seeking dramatic performance improvements gains higher levels of cornering power, increased steering response & improved stability.

Today, automobile manufacturers offer Plus options on many new car models. One of the most frequent upgrades a car owner makes is fitting new wheels & tires. It is important that the plus sized replacement tire/wheel assembly retains the original overall diameter & that there is enough clearance in the wheel well to accommodate the plus sized replacement through the entire range of wheel/suspension travel & steering lock.

WARNING: Before you replace your tires, always consult the vehicle owner's manual & follow the vehicle manufacturer's replacement tire recommendations. Vehicle handling may be significantly affected by a change in tire size or type. When selecting tires that are different than the original equipment size, see a professional installer in order to make certain that proper clearance, load carrying capacity & inflation pressure is selected. Never exceed the maximum load capacity & inflation pressure listed on the sidewall of the tire. Always drive safely & obey all traffic laws. Avoid sudden, sharp turns or lane changes. Failure to follow this warning may result in loss of control of the vehicle, leading to an accident & serious injury or death.

Finally, the Tire Technician must ensure that the plus sized replacement tire carries a rated load capacity equal to or greater than the original equipment tire, & must use the proper inflation pressure. (Never exceed the maximum tire pressure shown on the sidewall.) Please refer to your vehicle's Owner's Manual. Your Dunlop dealer can discuss with you Plus sizes for your vehicle.