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Basic Car Care : How Tire Sizes Work

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Uploaded by on Oct 28, 2008

The inches used to describe tire size refer to the diameter of the tire's rims, and the recommended size of tires should always be used. Discover how tire sizes work and how wrong sizes can be detrimental with tips from a mechanic in this free car-care and automotive maintenance video.

Expert: Richard Goms
Bio: Richard Goms has been researching genealogy as an amateur and a professional for the last 32 years.
Filmmaker: Michael Burton

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  • Its not the size of the tire, its how you use it.

  • jayc2586:

    In the example shown in the video:

    1) The '215' means that the tread is 215 millimeters across.

    2) The '65' means that the height of the sidewall is 65% as wide as the tread. For the tire in the video, the sidewall is 139.75 millimeters high (215 x .65 = 139.75).

    3) The spokesman in the video didn't mention it, but if you change tire sizes, and thus change your overall tire/wheel diameter, your speedometer will be rendered inaccurate.

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All Comments (41)

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  • I want to ask sth: does 16 x 7.0 alloy wheel mean 16 inches height and 7 inches wide?

  • not even close dude!! your lame ass video for 12 y.o. kids?

  • I know you, im not sure from where, but i swear to god that i know you.

  • @10ony thats the distance form teh bead tot he tread, not the overall height of the tire.

  • Only World of Wheels provide 30 days warranty on their cars.

    

  • how can it be it be 139.75 mm in height that would be 5.5 inches hieght isnt tht kinda impossible?

  • I love his double chin and how it shakes when he talks.

  • although this video was helpful, he did miss some information that needed explaining like the aspect ratio to the tire width, rather than just saying its the height of the tire

  • uncle, you are very good instructor.

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