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Tire Size

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A special thanks to KXAS NBC5 in Fort Worth, Texas for inspiring this and all of the Tire pages.

"What is the size of my tires and what do those numbers mean?"

There are 3 different designations for tire size.

Conventional Method:

8.75R-16.5C

8.75 - Tire Section Width

R - Radial construction (no letter here indicates bias ply construction)

16.5 - Rim Diameter

C - Load Range

Alpha Method

LR60-15B

L - Alpha Designation Letter (the higher the letter, the greater the load limit)

R - Radial construction (no letter here indicates bias ply construction)

60 - Aspect Ratio (Tire section height is 60% as great as the width)

15 - Rim Diameter

B - Load Range

Metric Method

Passenger car: P215/75R15

P - Passenger Car type tire

215 - Tire section Width (millimeters)

75 - Aspect Ratio (Tire section height is 75% as great as the width)

R - Radial construction (no letter here indicates bias ply construction)

15 - Rim Diameter

Light Trucks: LT215/85R16C

LT - Light Truck type tire

215 - Tire section Width (millimeters)

85 - Aspect Ratio (Tire section height is 85% as great as the width)

R - Radial construction (no letter here indicates bias ply construction)

16 - Rim Diameter

C - Load Range

Metric Method with Speed Rating

Passenger car: P215/75SR15

P - Passenger Car type tire

215 - Tire section Width (millimeters)

75 - Aspect Ratio (Tire section height is 75% as great as the width)

S - Speed rating

R - Radial construction (no letter here indicates bias ply construction)

15 - Rim Diameter

Light Trucks: LT215/85HR16C

LT - Light Truck type tire

215 - Tire section Width (millimeters)

85 - Aspect Ratio (Tire section height is 85% as great as the width)

H - Speed rating

R - Radial construction (no letter here indicates bias ply construction)

16 - Rim Diameter

C - Load Range

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