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Originally Posted by stephen low
15" tyre what would be a normally tread width for this sized tyre?
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I bought some Yokohama AVID S/T 15" tyres from Tirerack. A significantly better tyre than the old choices we have here - TA's & 325's. Plus heaps cheaper of course.
Front: 245/60/15 (673mm diameter)
Rear: 295/50/15 (678mm diameter)
I went with these sizes so they would bag nicely on original sized 7.5" & 9.5" rims. And it's a compromise against width and diameter.
If you want a bigger diameter you could go with:
Front: 225/70/15 (696mm)
Rear: 275/60/15 (708mm) Lots of Cobras run this size.
If you want an original look, then go with Goodyear vintage bluestreaks(not approved):
Front: 26.5x8.0-15 (665mm)
Rear: 26.5x10.0-15 (678mm)
With larger diameter rims you actually struggle with rear tyre diameter. e.g. 315/35/17(Sumitomo's etc) are just over 650mm in diameter. You would do better with 335/35/17's, but still fall short of diameters of 15" tyres. 18" it is basically worse.
The bigger the diameter the tyre, the lower the car will look as you are filling the wheel arches and gaining clearance underneath.
The downsides of 15" rubber is performance and brake size availability. You can only squeeze in a maximum of 310mm rotors using the slimest of calipers.
At least with tyres like AVID S/T street performance is at least respectable.
Also something like 315/35/17 would not appear any wider from the rear of the vehicle than say my 295/50/15 tyres. My 295's have a overall width of 315mm when mounted on 9.5" rims. A 315/35/17 on a 11" rim would have an overall width of 320mm from memory...amazing hey. But the 315 has a massive 35mm more tread width.
315/17 Sumi's are fantastic value and a good option for wide 17" rubber.
Check the wheel arch sizes on the G-Force, if they are anything like the original Cobra's, you will always struggle to fill them.