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Thread: P38 Aftermarket Tyre Size Guide

  1. #41
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    they told me the same thing, 50mm increase in tyre diameter is the maximum permitted, no exceptions, did see someone was going to try and argue that land rovers all have similar chassis and running gear and get plus 50mm on the defender standard size tyre but that was regarding a classic and I'm not sure he was going to get very far!

  2. #42
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    Does anyone have the size of an 18" fitted to a P38?

    Since they were a factory option surely the 50mm increase can be based on them and not on the 16" wheels

    Steve

  3. #43
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    They are also 29" wheels. I checked hoping that my 32" were legal... But not.

    So I just run low pressure ha ha.

  4. #44
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    Quote Originally Posted by TheTree View Post
    Does anyone have the size of an 18" fitted to a P38?
    Since they were a factory option surely the 50mm increase can be based on them and not on the 16" wheels
    Steve
    50mm increase is based on the Outside Diameter (OD) of the tyre, not the rim.

    255/55R18 is a standard factory size for the P38 that gives 29" (737mm) OD.
    My toys, projects and write-ups at PaulP38a.com

  5. #45
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    Quote Originally Posted by PaulP38a View Post
    50mm increase is based on the Outside Diameter (OD) of the tyre, not the rim.

    255/55R18 is a standard factory size for the P38 that gives 29" (737mm) OD.
    Hi mate

    I was aware it is the rim size, my thought wad that perhaps it was a slightly bigger tyre OD

    Steve

  6. #46
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    Hi

    chatting with Benji from Rampt customs yesterday he mentioned the regulations were related to diff and brakes.

    Eg: Certain Nissans came with bigger tyres and if you used their diffs on another vehicle apparently it is legal

    Not much use to us P38 owners though I don't think

    Steve

  7. #47
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    Actually this may help us because the P38 and the Defender share the same "Rover" type diff and the Defender came from the factory with 32" wheels

    So it may be possible to argue that the diff supports larger size wheels.

    Getting way out of my zone of knowledge here though !

    Steve

  8. #48
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    To justify a Defender diff under a P38 (to the law) would require a mod plate... But it sure does open up the choice of wheels and gives those floating axles ;-)

    Cheers
    Keithy

    2002 P38 Range Rover HSE

    Sequential LPG - Redarc Charger - TPMS - Ashcroft Locker
    Wheel Carrier - Bullbar & Spotlights - 285/75/16 BFG KM3’s
    On Board Solar - Stainless Snorkel - 2” Suspension Lift

  9. #49
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    Quote Originally Posted by Keithy P38 View Post
    To justify a Defender diff under a P38 (to the law) would require a mod plate... But it sure does open up the choice of wheels and gives those floating axles ;-)

    Cheers
    Keithy
    I sometimes wonder if people use the term diff when the mean the entire axle assembly

    But it's worth a try; "I have a Defender differential fitted ossifer"

    Steve

  10. #50
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    That's my bad - in North QLD we have issues saying what we really mean ;-)

    Cheers
    Keithy

    2002 P38 Range Rover HSE

    Sequential LPG - Redarc Charger - TPMS - Ashcroft Locker
    Wheel Carrier - Bullbar & Spotlights - 285/75/16 BFG KM3’s
    On Board Solar - Stainless Snorkel - 2” Suspension Lift

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