Basic Car Care : How Tire Sizes Work

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.

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23 Responses to “Basic Car Care : How Tire Sizes Work”

  1. KumandanteRaymundo Says:

    Simple and easy to understand!

  2. jmvneto51 Says:

    See my drawing at youtube “Projeto tire size”. Projeto means ‘project’ in portugues.

  3. jmvneto51 Says:

    215/65-16 …… 65 is a percentage of the width which is, in this case, 215 (mm). So, a 205/65-16 is at the same time less wide and a little lower because 65% of 205 gives you a smaller number for tire wall height. See my drawing no “Projeto tire size”.

  4. SirInternet Says:

    Thanks for the videos Richard :) I’m a newbie and your videos are really helping towards my goal of being a hobbyist auto tech.

  5. sarumitai Says:

    I just bought some tires today and wondered what the numbers meant.

  6. quantomic1106 Says:

    very helpful

  7. mr2ya Says:

    Donk ride owners worst nightmare.

    I would love to see him try to explain rim offset.
    That would be funny.

    Overall hes right, but forgot some things like.
    Treadwear number, What The letters such as R,Z,Y mean, And how to tell the born on date of the tire.

  8. UntergrundBaer Says:

    very good to know!!! thx

  9. ChernijVitaj Says:

    thnx

  10. FinalFan0 Says:

    Hahah this guy is hilarious… just like an Auto Technician. (Auto Technicians don’t really care about tires, so they don’t really know tires; they just know what makes them wear improperly)

  11. paddyshouse Says:

    i totally understand o_0

  12. coolglock19 Says:

    Trick or Treat :D

  13. jayc2586 Says:

    3 makes sense. thanks a lot, appreciate the info

  14. foxygranpa6 Says:

    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.

  15. jayc2586 Says:

    THANK YOU… I finally know what those numbers mean!

  16. verycoldice2 Says:

    wow I finally learned something from Youtube. niiiiiice

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  18. dmacosta1 Says:

    Thank-you

  19. Downfacingdog Says:

    Thank-you for this. Very much!

  20. hahanicevideo Says:

    first comment…

  21. stealthknifer0 Says:

    first comment yay

  22. darkodor2 Says:

    nice

  23. Alex69 Says:

    But these were lies from a memeber of a terrorist group. ,

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