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Tech Bulletins

MICKEY THOMPSON® METRIC CONVERSION CHARTS

Example: 235/70R15

235	= Section width in millimeters
70	= Aspect ratio (ratio of section height to section width)
15	= Rim diameter
R	= Radial Construction B = Bias Construction D = Bias Belted Construction

To calculate:

Tire Width:	Section width divided by 25.4 (Ex: 235 / 25.4 = 9.25")
Section Height:	Tire width times aspect ratio (Ex: 9.25" x 70% = 6.48")
Overall Diameter:	Section height times 2 plus rim diameter (Ex: (6.48" x 2) + 15 = 27.96")

Therefore, a 235/70R15 is approximately 28" tall x 9.25" wide.

IMPORTANT
There are many variables that affect a tire width such as rim width, air pressure, sidewall constructions, etc. just to mention a few. Please feel free to use these charts as a guide only. If you are trying a custom fit and our tire looks like it may be a tight fit, contact the M/T® Tech Department and we will be happy to help you with your fitment issues.

This is Mickey Thompson General Technical Bulletin #4.
Revised 6/30/09
For more information regarding Mickey Thompson Performance Products
Website: mickeythompsontires.com
E-mail: tech@mickeythompsontires.com
Phone: 330.928.9092 OR 951.817.0101

Why would I choose to use a wide tire? Why would I choose a narrow tire?

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