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Thread: Another tyre question

  1. 7th September 2009, 12:32 PM #1
    malsgoing130 Guest

    Another tyre question

    I am about to replace the 130's tires and wanted to go to 255/85 16 which seems to be the right option, but right now i have 265/75 16 and wanted to use the 2 good ones as spares. Logic tells you that the width is the big issue. By this what i mean is if you have to put the spare on that axel would mean that you have tires of differing dimensions, would this do damage? i know that on trucks you should not do it, is it the same on fenders?
    Thanks
    mal
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  2. 26th September 2009, 07:02 AM #2
    wisey110
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    You'll end up putting huge stress on your drivetrain. the smaller tyre will drag. old man had to drive around in a freelander because disc was getting fixed the rear tyres were screaming couldn't figure out why until he looked at the sizes.
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  3. 26th September 2009, 10:51 AM #3
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    spudboy
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    That;s a fair bit of difference. Here's some stats:

    Tyre 1 - 265/75R16 >Tyre 2 - 285/85R16
    Section Width:10.43 in 265 mm Section Width:11.22 in285 mm
    Overall Diameter:--Overall Diameter:31.64 in803.65 mm Overall Diameter:35.07 in890.77 mm
    Sidewall Height:--Sidewall Height:7.82 in198.62 mm Sidewall Height:9.53 in242.06 mm
    Radius:--Radius:15.82 in401.82 mm Radius:17.53 in445.26 mm
    Circumference:--Circumference:99.39 in2524.5 mm Circumference:110.1 in2796.5 mm
    Revs per Mile:-Revs per Mile:657.3 Revs per Mile:593.0

    Hmmm - the formatting didn't copy nicely Go here to see in the proper format: http://www.1010tires.com/tiresizecalculator.asp
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  4. 26th September 2009, 11:06 AM #4
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    Lotz-A-Landies
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    Quote Originally Posted by malsgoing130 View Post
    I am about to replace the 130's tires and wanted to go to 255/85 16 which seems to be the right option, but right now i have 265/75 16 ...
    Quote Originally Posted by spudboy View Post
    That;s a fair bit of difference. Here's some stats:

    Tyre 1 - 265/75R16 > Tyre 2 - 285/85R16
    Unfortunately the sizes compared weren't the same as the original post:

    Tyre Difference Comparision
    Select Wheel/Tyre 1 / R 255/85 R16
    Select Wheel/Tyre 2 / R 265/75 R16

    Results for your selected Wheel/Tyre 1
    Rolling Radius 419.95mm
    Circumference 2638.62mm
    Diameter 839.9mm
    Wheel Cover Size Size 009

    Results for your selected Wheel/Tyre 2
    Rolling Radius 401.95mm
    Circumference 2525.53mm
    Diameter 803.9mm
    Wheel Cover Size Size 009

    Differences between Wheel/Tyre 1 & 2
    Rolling Radius -18mm
    Circumference -113.09mm
    Diameter -36mm
    When your speedo reads 100km/hr you're actually at 95.52 km/hr

    You won't find me on: faceplant; Scipe; Infragam; LumpedIn; ShapCnat or Twitting. I'm just not that interesting.
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  5. 26th September 2009, 02:08 PM #5
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    spudboy
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    Quote Originally Posted by Lotz-A-Landies View Post
    Unfortunately the sizes compared weren't the same as the original post:
    Oh - bugger -sorry about that. Short term memory is getting worse the older I get


    Anyway - hope Diana's corrected figures are useful....
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  6. 26th September 2009, 02:59 PM #6
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    buzz66
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    Quote Originally Posted by wisey110 View Post
    You'll end up putting huge stress on your drivetrain. the smaller tyre will drag. old man had to drive around in a freelander because disc was getting fixed the rear tyres were screaming couldn't figure out why until he looked at the sizes.
    Not quite true. Even at 100 KPH the different tyre sizes will cause the rear diff hemisphere rotation of 1.07 revolutions per second. This is not enough to cause inadequate lubrication of the hemisphere shafts, planet, spider gears. The centre diff will be even less worked.

    It will test the limits of the V.C. type transfer case used in 89 and later Rangy's.

    As for a freelander I am not familar with its drivetrain.
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