At Parker Tire Service, we’re Delta, Ohio’s number one source of top-quality Goodyear and Continental tires. We provide motorists, truckers, and farmers alike with new brand new tires, wheels, and other mechanic services throughout Delta, OH, Swanton, OH, Wauseon, OH, and surrounding areas.

Use our consumer tire guide below to learn more about tire type, tire width, aspect ratio, construction, wheel diameter, load index and speed rating.  When you come to our store, we will be happy to answer any questions you have about tires, mechanic services, and more.

Know what you’re buying.

At Parker Tire Services, we like to keep our clients well informed about the quality and performance of the tires they want to drive away with. We show you what to look for in a tire, from the  type of tire to the measurements.  Find out how these basic tire traits can help you choose the right tire for your vehicle. Browse our tire catalog full of the best brands in the industry.

Tire Type

This determines what type of vehicle the tire fits: passenger (P), light truck (LT), temporary spare (T), or special trailer (ST). If there is no letter, that means the tire is euro-metric.

Tire Width

This number, also known as section width, denotes the width or density of the tire in millimeters when measured from the widest point of a tire’s sidewall to the widest point of its inner sidewall.

Aspect Ratio

This denotes the ratio of tire’s sidewall height to the tire’s width. Here, the sidewall height is 55% of the width. Low percentages mean smaller sidewall heights, which could be better for taking corners but rougher over potholes.


The “R” represents the internal construction of the tire. In this case, the “R” means “Radial”. Most tires on the road will have radial construction. Other letters one might see are D (diagonal) and B (belted).

Wheel Diameter

This number represents the diameter of the wheel that the tire is designed to fit. In this case, the tire will fit an 18-inch rim.

Load Index

Refers to the weight a tire can carry at its maximum rate of inflation. The number corresponds to a load capacity found on a load index chart.

Speed Rating

Designates the maximum safe speed at which the tire is designed to carry a load under certain conditions. The range of speed ratings is from A (lowest) to Y (highest), with the only exception being that H falls between U and V. Surpassing the lawful speed limit is not recommended.

Tire Wear Information

At Parker tire, we see a variety of wear and tear on tires every day. This can be caused by driving on over-inflated or under-inflated tires, having an uneven camber, or other reasons.
See a specialist at Parker Tire Services today if you suspect wear on your tires.

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