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Thread: +30 offset

  1. #13
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    • You can't reduce the track on a car (mentioned above).
    • You can increase your track on a MC type vehicle, like a prado, up to 50mm. (ncop)
    • Use http://www.willtheyfit.com/ to check the track change (plug in your details and your proposed details).
    • The wheel size database thread on this forum is a very good source of information. It will help gain an understanding of what you need to know.
    • My understanding for 17" wheels/tyres is that 285/70/17 is the maximum practical size you can go before you need to start considering large mods.
    • The standard 17"x7.5 GXL wheel offset is +25. Going a lower offset will widen your track. The maximum offset for a 285 without rubbing is somewhere in the vicinity of +15-+18mm for a 7.5 wide wheel. I am unsure about the kdss gear though.
    • When going a 8 or 9" wheel, you need to consider the expanded width of the rim relative to the offset, and the track. My latest purchase is 17x8 +10, which is a 21mm track difference per wheel or 42mm in total. 4 more mm per wheel and I'd be breaking the rules.

  2. #14
    Well I settled on Tuff T05 20x9 rims with 275/55R20 BFG KO2's..

    I just want to be 100% certain that they'll be ok before ordering it all that it will fit..

    There's a bloke who has 285/50R20's fitted and they are 0.7" diameter less but 0.4" wider and he seems to not have a problem..

  3. #15
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    Quote Originally Posted by mjrandom View Post
    No. Won't fit (will rub on the KDSS naughty bits) and would be illegal anyway because they reduce track. FJ wheels fit and are legal. I think they are +15 but check the wheel database on here.
    This +1.
    +30 makes it a narrower track = illegal. You need to go < +25 (which is the std 150 series offset).
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  4. #16
    Out of control poster! amts's Avatar
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    Quote Originally Posted by countryferal View Post
    Well I settled on Tuff T05 20x9 rims with 275/55R20 BFG KO2's..

    I just want to be 100% certain that they'll be ok before ordering it all that it will fit..

    There's a bloke who has 285/50R20's fitted and they are 0.7" diameter less but 0.4" wider and he seems to not have a problem..
    Should be fine. But what is the rim offset?
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  5. #17
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    Can you help me to understand this - I thought the track is measured from centre of wheel to centre of the other wheel, so should be accounted by the 2 x the offset. Ie, if you change from +25 to +10 the means the centre of the rim (and wheel) moves 15 mm outwards, giving net 30 mm track increase.

    What am i missing?

    Quote Originally Posted by Nik83 View Post
    • When going a 8 or 9" wheel, you need to consider the expanded width of the rim relative to the offset, and the track. My latest purchase is 17x8 +10, which is a 21mm track difference per wheel or 42mm in total. 4 more mm per wheel and I'd be breaking the rules.

  6. #18
    Quote Originally Posted by amts View Post
    Should be fine. But what is the rim offset?
    They're +18

  7. #19
    Out of control poster! amts's Avatar
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    Quote Originally Posted by countryferal View Post
    They're +18
    You're good to go.
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  8. #20
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    Quote Originally Posted by Nik83 View Post
    • You can't reduce the track on a car (mentioned above).
    • You can increase your track on a MC type vehicle, like a prado, up to 50mm. (ncop)
    • Use http://www.willtheyfit.com/ to check the track change (plug in your details and your proposed details).
    • The wheel size database thread on this forum is a very good source of information. It will help gain an understanding of what you need to know.
    • My understanding for 17" wheels/tyres is that 285/70/17 is the maximum practical size you can go before you need to start considering large mods.
    • The standard 17"x7.5 GXL wheel offset is +25. Going a lower offset will widen your track. The maximum offset for a 285 without rubbing is somewhere in the vicinity of +15-+18mm for a 7.5 wide wheel. I am unsure about the kdss gear though.
    • When going a 8 or 9" wheel, you need to consider the expanded width of the rim relative to the offset, and the track. My latest purchase is 17x8 +10, which is a 21mm track difference per wheel or 42mm in total. 4 more mm per wheel and I'd be breaking the rules.
    That has got to be one of the best website links I've seen for a long time - thanks for posting that Nik!

  9. #21
    Quote Originally Posted by drwormy View Post
    Can you help me to understand this - I thought the track is measured from centre of wheel to centre of the other wheel, so should be accounted by the 2 x the offset. Ie, if you change from +25 to +10 the means the centre of the rim (and wheel) moves 15 mm outwards, giving net 30 mm track increase.

    What am i missing?
    You are correct if you use the same width rim. But if the rim is say 1 inch (25.4mm) wider than previous rim, it will be 12.7mm wider either side. Moving out 15mm plus 12.7mm etc.

  10. #22
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    But if track is defined as the distance between the centre of the wheels, and offset is the distance from the hub mating surface to the centre of the wheels then changing rim width (keeping offset fixed) cant change track.

    Quote Originally Posted by All in View Post
    You are correct if you use the same width rim. But if the rim is say 1 inch (25.4mm) wider than previous rim, it will be 12.7mm wider either side. Moving out 15mm plus 12.7mm etc.

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