tire size

tire size

Moderated by: Forum moderatorskirsty, Review Centre

  • clueless. on 5 May 2003 6:18 PM

    From CT, 1 post


    My civic uses 185/65-14 tires. A friend has some brand new 185/75-14. Will these fit? i dont know really know anything about tire sizes.

  • Phat Ryde. on 28 May 2003 9:52 AM

    From Hamilton, Ontario, 1 post


    Yes, the tires will fit. 65 verses 75 just means the thickness of the tire. Low profile tires are usually 40.

  • M404 WSC Rank: Corporal on 28 Oct 2006 6:42 PM

    From Glenrothes, 8 posts


    Originally posted by clueless. on 5 May 2003 6:18 PM
    My civic uses 185/65-14 tires. A friend has some brand new 185/75-14. Will these fit? i don't know really know anything about tire sizes.



    Your tyres are 185 mm wide and fit on a 14 inch diameter rim. the other number (65) is the height of the sidewall, expressed as a percentage of the width. The outside diameter of your tyres can be calculated as 14 inches + 2 x (0.65 * 185 mm), as you have a sidewall thickness at the top and bottom of the rim. Doing the maths I calculate that your tyres are 23.46 inches in diameter, your friend's are 24.92. If you fit the larger tyres you will be travelling 6 % faster at the same speedo reading. There will be associated changes to acceleration and top speed. The handling will be different, but they will fit.