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Thread: Wheel Offset Calculator

  1. #1
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    OK you know how wide your wheels are, but you want to know how others compare... and more inportantly if they will fit/need mods.
    this link tells you how much closer the new wheel will be to your strut (i.e. work out if you need to run a spacer and what thickness)
    Also going to more negative offset - works out how much further new wheel will protrude than old wheel (i.e. to flare or not to flare)





    I'm sure someone will use a standard wheel 13x5.5 +27 and give you strut and guard clearances.

    Lets get a database going with what you use: wheel size & offset, tyre size, std/coilover sus, flares/spacers and relevant front/back clearances.

    *E7 or 86

    Also a quick reference table relating back-spacing, width and offset:




    **1" = 25.4mm

  2. #2
    Veteran DRFTPG's Avatar
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    excellent idea 741!!!

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    Used this before, definately useful for offset noobs, +repz
    RT142 Estate.

    AJPS.

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    what size wheel does jdm ae86 run ?

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    14x6?
    RT142 Estate.

    AJPS.

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    ah ok that would be good, im pretty shaw your only allowed to go 2" bigger from factory ( to fill out engineers report)

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    i know this is an old thread but does anyone else think this should be stuck?

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    Shit yeah, make it a sticky, very helpful.

    Regarding clearance:

    On the front of an E7 with Corona arms (+10mm track) and ae86 power steering arms, the minimum backspacing that can be run is 4" when using a 185/60/14 otherwise the tire will scrape on the inner chassis on full lock.

    So without a spacer, you'd be looking at;

    - 7J in a 0
    - 7.5J in a -6
    - 8J in a -10
    - 8.5J in a -16

    offsets are slightly less than for the specified backspacing due to tire stretch making a bit more clearance.
    RT142 Estate.

    AJPS.

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