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  1. #1
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    Default Advice on Tyre Sizes

    Good Morning All

    Please can you advise me on picking a tyre size. I have a Toyota Landcruiser 2005, 100 Series. Rim 8jx17 ET60, with 275/65R17's (BF's).

    I have some new suspension put in which raised the car about 40mm. There is now a huge gap in the wheel arch above the wheel. So i have no doubt it can fit larger tyres. Im wanting to upgrade to 285/70R17's (BF's). How do i know if this will fit the current rim and what are the pro's and con's of doing this. I understand this affects my speedometer, but if anything its now more accurate. I have been advised by some people that i can do this on the current rims with no issue, others say ill strain my gearbox and this is not good for the car.

  2. #2
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    Default Re: Advice on Tyre Sizes

    285/70R17 should be no problem on a 100 Series, many 100 series vehicles are fitted with 285/75R16, which is essentially the same tyre size, but different Rim diameter, so I do not foresee any problems to be honest
    Christo Davids
    Land Cruiser 105 4500 EFI
    Hilux 2.8GD6 Extracab 4x4

  3. #3
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    Default Re: Advice on Tyre Sizes

    My rule of thumb is to stay as close as possible to OEM spec. there is a design reason for the size. It is also sort of a safety requirement that speedos overread by some margin. However, it remains your decision. Google a proper tyre OD calculator, and compare things like revolutions per kilometer etc. There are even ones telling you if your proposed choice is good or bad.
    Die B staan vir Beneke

  4. #4
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    Default Re: Advice on Tyre Sizes

    Etienne, the Wranglers are sold with 31 inch tyres but designed for up to 35.....
    Jakes Louw
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

  5. #5
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    Default Re: Advice on Tyre Sizes

    Critical info:

    Is this a daily drive or only occasionally
    Which engine
    Do you tow more than 750kg
    Donít blame yourself over past mistakes. Itís like driving down the N1 while looking in the rear view mirror only.

    2000 Patrol GU 4.2D(onkey) "old-timer" chugging along towards 900 000 km.
    2014 Patrol GU 3.0CRD "teenager" in puberty - 131 000 km
    2007 Echo3 Trailer "the nest" with Braked Axle fitted >60 000 km
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  6. #6
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    Default Re: Advice on Tyre Sizes

    Quote Originally Posted by jelo View Post
    Etienne, the Wranglers are sold with 31 inch tyres but designed for up to 35.....
    Hi Jelo, so what would you say the pro's and con's would be

  7. #7
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    Default Re: Advice on Tyre Sizes

    Quote Originally Posted by Dungbeetle View Post
    Critical info:

    Is this a daily drive or only occasionally
    Which engine
    Do you tow more than 750kg
    HI Dungbeetle

    This is for daily drive around town, and then quite often i tow boats and camping trailers on dirt roads. 4.7 Petrol

  8. #8
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    Default Re: Advice on Tyre Sizes

    I dont think gearing will be an issue up to 33 inch. Your speedo will be out or maybe closer to true speed. More fuel. Slower pull away. But man o man 35s looks good.

  9. #9
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    Default Re: Advice on Tyre Sizes

    Quote Originally Posted by Brian1988 View Post
    Hi Jelo, so what would you say the pro's and con's would be
    As long as the tyres don't rub on articulation or on full lock turns, there are no cons.

    Probably the best is that your speedo might actually be accurate.
    Jakes Louw
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

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