TIRES

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Service Appointments

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Repairs - Purcell Tire and Service locations can handle almost any type of vehicle repair. Below is some helpful information about common types of repair.
Diagnostics - Since 1936, Purcell Tire has provided quality products and services including diagnostic services and complete automotive repair.
Oil & Lube - To make sure your engine is protected at all times, your vehicle manufacturer recommends changing the oil and oil filter regularly. This will keep you engine working its best and may avoid costly repairs down the road.
Brakes - No matter what your brake system needs, Purcell Tire is here to help ensure that your car braking system is functioning correctly.
Batteries - We work with you to create an understanding of your car's battery and electrical system, and how to keep both healthy so you stay on the road.
A/C Service - To make sure all the parts and components of your Heating and A/C system are working properly, Purcell Tire recommends having your system checked at the beginning of each season.
Tires - Getting the most out of your tire investment includes the proper care and maintenance that you can do along with the tire-related services we do at Purcell Tire.

Tire Terminology

Are you "tire-literate"? If you aren't, our Tire Terminology will help you better understand all aspects of your tires.

  • Aspect Ratio
  • Heat Cycle
  • How a Tire is Made?
  • Load Index
  • Plus One Concept
  • Speed Rating Letter
  • Technical Aspects of Alloy Wheels

Aspect ratio - is the ratio of section height to section width. A 70 series tire, therefore, is a tire whose height is equal to 70% of its width. Lower profile tires hence have lower series numbers. It should be noted that in general, tires with a lower section height (i.e. where the aspect ratio is lowered) have a higher cornering force and therefore improved performance-handling characteristics.

Load Index - Many tires come with a service description added on to the end of the tire's size. These service descriptions contain a two-digit number (load index) and a letter (speed rating). The load index is a representation of the maximum load each tire is designed to support. Because the maximum tire load capacity is branded on the tire's sidewall, the load index is used as a quick reference.

Use the following chart to determine the maximum load-carrying capacity based on a tire's load index:

Plus One Concept - The plus one concept describes the proper sizing up of a wheel and tire combo. Basically, each time you add 1 inch to the wheel diameter, add 20mm to the tire width and subtract 10% from the aspect ratio. This compensates nicely for the increases in rim width that generally accompany increases in diameter too. By using a larger diameter wheel with a lower profile tire it's possible to properly maintain the overall rolling radius, keeping odometer and speedometer changes negligible. By using a tire with a shorter sidewall, you gain quickness better than the sidewall of the tire, so the more wheel and less sidewall there is, the better it looks. However, be prepared for a stiffer ride as there will be less sidewall to cushion undulations in the road.

Speed Rating Letter - All tires are rated with a speed letter. This indicates the maximum speed that the tire can sustain for a ten minute endurance without coming to pieces and destroying itself.

Letter   MPH KM/H

P 95        150

Q 100      160

R 106      170

S 112      180

T 118      190

U 124      200

H 130      210

V 150      240

W 168      270

Y 188      300

Z 149+    240+


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