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Thread: Need some rear wheel/tire size advice

  1. #1
    Junior Member
    Join Date
    Jul 2017
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    The Villages Fl.
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    12

    Need some rear wheel/tire size advice

    I have spent today reading every post in the wheel/tire forum and I am still confused.
    I want to put 255/40/18 tires with 18x8 wheels with 45mm offset on the rear of my 818s.
    The tire is 26" in diameter. Is that too large? Will it rub?

  2. #2
    Senior Member Bob_n_Cincy's Avatar
    Join Date
    Sep 2012
    Location
    Cincinnati OH
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    3,256
    Quote Originally Posted by redbudrr View Post
    I have spent today reading every post in the wheel/tire forum and I am still confused.
    I want to put 255/40/18 tires with 18x8 wheels with 45mm offset on the rear of my 818s.
    The tire is 26" in diameter. Is that too large? Will it rub?
    I am successfully running 255/40/17 tires with 17x9 wheels with 30mm offset.
    To keep them from rubbing I'm running street ride height with driver and passenger sitting in car. OEM trailing arms.
    Also running 500 rear spring to lower travel and body roll.
    Everything is tight clearances. To go any bigger, I would look at fender flairs.
    Bob

    rear tire.jpg

    PS: In this picture you can see my cold air intake in the side scoop. I think this is important as the air in the engine bay can be much hotter.
    Last edited by Bob_n_Cincy; 09-10-2017 at 08:17 PM.
    818S #22 Candy Blue Frame, Front Gas Tank, 2.5L Turbo, Rear radiator, Shortened Transmission, Wookiee Compatible, Console mounted MR2 Shifter, Custom ECU panel, AWIC soon
    My Son Michael's Turbo ICE Build X22 http://thefactoryfiveforum.com/showt...rts-818S-Build
    My Electric Supercar Build X21 (on hold until winter) http://thefactoryfiveforum.com/showt...e-Build-Thread

  3. #3
    5x100 Enkei RPF1 17x9 +35 with 245/40/27 Dunlop Direzza ZII Star Spec (works in the rear with about 10mm of space from the trailing arm. No other fitment issues. Don't work in the front at all).
    5x100 Enkei RPF1 17x8 +45 with 225/45/17 Blizzak WS80 (these do not work well in the front as they hit the sway bar end links, and fender liners).
    5x100 Enkei RPF1s 17x8 +45 front, 17x9 +35 rear with 215/45/17 Falken Azenis RT615K+ and 255/40/17 Falken Azenis RT615K+ fit well, front tires rub at full lock with and without a 5mm spacer up front.

    https://tiresize.com/comparison/ Use this tool to compare sizes. It was helpful for me to try/error on sizes.

  4. #4
    Senior Member SixStar's Avatar
    Join Date
    Feb 2013
    Location
    Westminster, MD
    Posts
    598
    zajzvUk.jpg

    255/40-17 on 17x9 in front
    285/30-18 on 18x9.5 in back
    Owner/builder - AEM Intakes 818R #85

  5. #5
    Senior Member
    Join Date
    Jun 2013
    Location
    Bowling Green, KY
    Posts
    921
    225's on 17X8 and 265's on 18X9.5 40mm offset
    had 235/40X17 on the front (BFG R1s) on the front, the tires did rub under hard braking and high load corners.

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