Wheel Offsets: All numbers negative

  • 911 – 77 – Narrow Body
    • These cars shipped with 6×15″ wheels all around in 12.5mm offset
    • In general you can run 7×15 or 7×16″ wheels all around with 12.5 or 23mm offset
    • You can run late style wheels with 53mm offset (16, 17) and 1/2-3/4 (12 to 19mm) spacers all around in widths up to 8″
  • 911 – SC/Carrera Flares, also 911 RS
    • These came with
      • 7+8 x 15 12.8mm offset
      • 6+7 x 16 10.5, 12.8 or 23mm offset and can easily run 7×16 23mm offset (944 turbo) and 9×16 23mm offset (930) wheels
    • Late model 17″ wheels (53mm offset) can be fitted with 1/2 (12mm) front and 1″ (25mm) rear spacers up to 8+9″, 225/255 tires
    • Late model 18″ wheels (50mmF, 65mmR) can be fitted up to 9″ Front and 10″ Rear with caution, 235/265 tires.
  • 930 Flares – 930 or 911 widebody
    • Note: For standard 911 suspension add 19mm and 50mm offsets to 930 wheels.
    • Standard 930 wheels wee
      • 7×15 12.8mm and 8×15 1.28mm
      • 7×16 10.5 and 9×16 23mm
    • Late model 17″ wheels can be fitted, though it’s not enough tire, go to 18″
    • Late model 996 turbo offset wheels (8+11×18) with stock 225/295 tires are an easy fit.
    • Late model 997 S or C4S 19″ wheels are an easy fit with 235/305 tires.
    • Up to 10+12×17 is possible with up to 255/315 (easy) or 275/335 (hard)
    • Up to 10+12×18 is possible with 265/315 tires or 285/335 tires depending on manufacturer.

 

 

 
Tire Diameters for Common Porsche Fittments
Copyright 2000 Dr. Steve Timmins
InstantG, Inc.
Tire Diameter Stats Ref Dia
Dia 24.75 Kumho E Kumho V Hoozier gForce
185 75 14 24.93 0.7%
195 70 15 25.75 4.0%
205 65 14 24.49 -1.0%
205 50 15 23.07 -6.8% X X X
205 60 15 24.69 -0.3% X X
215 60 15 25.16 1.6% X
225 45 15 22.97 -7.2% X
225 50 15 23.86 -3.6% X X
225 55 15 24.74 0.0% X
245 50 15 24.65 -0.4% X X
205 55 16 24.88 0.5% X X X
225 50 16 24.86 0.4% X X X
245 45 16 24.68 -0.3% X X X X
255 50 16 26.04 5.2% X X
265 45 16 25.39 2.6% X
205 40 17 23.46 -5.2% X X
205 45 17 24.26 -2.0% X
205 50 17 25.07 1.3% X X
215 40 17 23.77 -4.0% X
215 45 17 24.62 -0.5% X
225 40 17 24.09 -2.7%
225 45 17 24.97 0.9% X X X X
235 40 17 24.40 -1.4% X X
235 45 17 25.33 2.3% X
245 40 17 24.72 -0.1% X X X
245 45 17 25.68 3.8% X X X X
255 40 17 25.03 1.1% X X X
255 45 17 26.04 5.2% X X
265 40 17 25.35 2.4% X
275 40 17 25.66 3.7% X X X X
315 35 17 25.68 3.8% X X X
335 35 17 26.23 6.0% X X
225 40 18 25.09 1.4% X
245 35 18 24.75 0.0% X
245 40 18 25.72 3.9% X X X
255 35 18 25.03 1.1% X
265 35 18 25.30 2.2% X X
275 35 18 25.58 3.3% X X
285 35 18 25.85 4.5%
285 30 18 24.73 -0.1% X X
295 35 18 26.13 5.6% X
305 30 18 25.20 1.8% X
315 30 18 25.44 2.8% X
335 30 18 25.91 4.7% X

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