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Thread: Basic tyre education please

  1. 29th August 2009, 08:34 AM #1
    kitacooch's Avatar
    kitacooch
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    Basic tyre education please

    Hi there, just wondering if someone would be kind enough to give me a quik education on what the tyre measurements etc on side wall mean.
    I undersatand as the following.
    265 70 R16
    265 is 265mm measurement of the total width of tyre.
    70 means that the wall height is 70% of the tyre width.
    R16, is the rim size.

    does this mean i cannot run 265 70 r16 and 235 70 r16 together as the wall heights will be different?

    how do you convert to inches eg 265 70 R16 i beleive to be close to 31's??

    any confirmation would be helpful
    cheers
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  2. 29th August 2009, 08:41 AM #2
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    Pedro_The_Swift
    Pedro_The_Swift is offline The MOD Father
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    http://www.aulro.com/afvb/good-oil/
    "How long since you've visited The Good Oil?"

    '93 V8 Rossi
    '97 to '07. sold.
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    '06 to 10. written off.
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  3. 29th August 2009, 09:02 AM #3
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    kitacooch
    kitacooch is offline Fossicker
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    Cheers mate but the link is broken, i will do a search what i shoulda done first
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  4. 29th August 2009, 09:29 AM #4
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    Pedro_The_Swift
    Pedro_The_Swift is offline The MOD Father
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    nope,, it was me

    try it again,,,
    "How long since you've visited The Good Oil?"

    '93 V8 Rossi
    '97 to '07. sold.
    '01 V8 D2
    '06 to 10. written off.
    '03 4.6 V8 HSE D2a with Tornado ECM
    '10 to '21
    '16.5 RRS SDV8
    '21 to Infinity and Beyond!

    1988 Isuzu Bus. V10 15L NA Diesel
    Home is where you park it..

    [IMG][/IMG]
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  5. 29th August 2009, 09:41 AM #5
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    gazk
    gazk is offline Master
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    This site explains all about the tyre markings and a lot more:
    Car Bibles : The Wheel and Tyre Bible Page 1 of 2

    regards
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  6. 29th August 2009, 10:01 AM #6
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    frantic
    frantic is offline ChatterBox Subscriber
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    1 inch is about 25mm so 265= 10.5 inches roughly and the 70 means 7.25 in. height tread to bead x 2 + rim16=30.5 in tyre dia. at a rough calc off the top off my head.
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  7. 29th August 2009, 10:35 AM #7
    slug_burner
    slug_burner is offline TopicToaster Gold Subscriber
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    total diameter of tyre is 2 wall hieghts plus the hole in the middle normaly filled by the wheel.

    265mm divided by 25.4mm will give you inches of tyre width =10.43"

    wall height is in your case 70% of the 10.43 = 7.303

    2 x 7.303 + 16( wheel size) = 30.6"

    as frantic said 10.5 x 31 is close enough for government work
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  8. 29th August 2009, 09:24 PM #8
    DeanoH
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    Found this to be good

    www.exploroz.com/Vehicle/Tyres/SizeCalc.aspx

    Deano
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  9. 30th August 2009, 09:08 PM #9
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    kitacooch
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    cheers for that guys, i now understand.
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