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Thread: GTM Custom Wheel Fitment

  1. #1
    Webmaster, FFR
    Join Date
    Feb 2011
    Location
    Middleboro, MA
    Posts
    1,833
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    GTM Custom Wheel Fitment

    Front Size: 8-9.5
    Offset: 50-65 mm
    Backspace Equation (inch): (width/2)+2.5
    Tire Size, 245/45/17. 245/40/18

    Rear Size (275-295): 9-10.5
    Offset: 40 mm
    Backspace Equation (inch): (width/2)+2
    Tire Sizes: 275/40/18, 285/40/17, 295/35/18, 295/30/19

    Wide Rear Size (305): 11-11.5
    Offset: 46 mm
    Backspace Equation (inch): (width/2)+2.25
    Tire Sizes: 305/30/19

    Extra Wide Rear Size (335)” 12-13
    Offset: 52 mm
    Backspace Equation (inch): (width/2)+2.25
    Tire Sizes: 335/35/17, 335/30/18

    Notes:
    1. Wheel width is the advertised width measured at the tire bead
    2. Factory Rear wheels use spacers provided with 275 tires for best fit
    3. Max. recommended tire diameter is 25.9” (from 335/30/18) – fitment of larger sizes is unknown and not recommended.

    GTM Alignment Specifications

    Front:
    Toe In (inches): 1/8
    Camber (deg): -0.25
    Caster (deg): 2.5

    Rear:
    Toe In (inches): 3/16
    Camber (deg): -0.5
    Caster (deg): N/A
    Dave Lindsey
    FFR's Mad Dog

  2. #2
    Member
    Join Date
    Feb 2011
    Posts
    58
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    Good information and specs on tires. I'm wondering if anyone can comment on a few more specifics about tire choices. I'm considering 245/40's on the front & 335/30's on the rear. Any cons to choosing a tire this big? What brands have people liked - Toyo? Kuhmo? BFGoodrich? What grade tire is needed for mostly street/occasional track use? Lastly, when do you use the spacer that came with the kit? Thanks for any info.

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