Faraz Posted September 7, 2013 Share Posted September 7, 2013 So i've bought a set of 20" wheels for the Z I'm looking to find out how far I can space the wheels out without any rubbing issues. I'm abroad at the moment so I can't fit them onto the car and measure. Here are the specs: 8.5j front and 10j rear 245/35 width front and 285/30 rear. I believe the offset is 18F and 20R. Anyone have any idea? Quote Link to comment Share on other sites More sharing options...
HmmBen Posted September 7, 2013 Share Posted September 7, 2013 Pretty sure theres only one way to find out, and thats to fit them and see. Depends if your car is lowered but I'd say try them as it is. The offsets sound alright but it does all depend. Quote Link to comment Share on other sites More sharing options...
Faraz Posted September 7, 2013 Author Share Posted September 7, 2013 Meant to add the car is on standard suspension. Quote Link to comment Share on other sites More sharing options...
KyleR Posted September 7, 2013 Share Posted September 7, 2013 On standard suspension they will fit, on lowered 30mm they will fit, so basically, they'll fit just fine and look well with those offsets, no spacers required. Quote Link to comment Share on other sites More sharing options...
HmmBen Posted September 7, 2013 Share Posted September 7, 2013 They just might look a bit silly with such an arch gap. and quite possibly raise the car aswell. So lowering springs or coilovers should pull it off well Quote Link to comment Share on other sites More sharing options...
KyleR Posted September 8, 2013 Share Posted September 8, 2013 If he uses a tyre calculator to get tyre sizes with the same rolling radius as oem, as he should, then the car will sit the same height, but definitely needs lowered. Quote Link to comment Share on other sites More sharing options...
Faraz Posted September 8, 2013 Author Share Posted September 8, 2013 I tried a tyre calculator - couldn't make much sense of it to be honest but the rolling radius was 4mm more than standard. Quote Link to comment Share on other sites More sharing options...
KyleR Posted September 8, 2013 Share Posted September 8, 2013 On both front and rear? 4mm is fine, you lose much more as the tread wears away. Quote Link to comment Share on other sites More sharing options...
Faraz Posted September 8, 2013 Author Share Posted September 8, 2013 (edited) I only checked the back yesterday, here are the numbers: FRONT Old New Diameter 659.7mm 679.5mm Circumference 2072.5mm 2134.7mm Poke 71.6mm 90mm Inset 131.6mm 126mm Speedo error 0% -2.91% Reading at 30mph 30mph 29.13mph Reading at 60mph 60mph 58.25mph Ride height gain 0mm 9.9mm Arch gap loss 0mm 9.9mm BACK Old New Diameter 677.7mm 679mm Circumference 2129.1mm 2133.1mm Poke 68.6mm 107mm Inset 134.6mm 147mm Speedo error 0% -0.19% Reading at 30mph 30mph 29.94mph Reading at 60mph 60mph 59.89mph Ride height gain 0mm 0.65mm Arch gap loss 0mm 0.65mm EDIT: That didn't come out like it should have. The first number is OEM and the second number is with the new wheels. Edited September 8, 2013 by Faraz Quote Link to comment Share on other sites More sharing options...
KyleR Posted September 8, 2013 Share Posted September 8, 2013 The front is aweful, try again with 245/30's which should be a better fit. And just to clarify, you're testing against 225/45/18 and 245/45/18? Quote Link to comment Share on other sites More sharing options...
Faraz Posted September 8, 2013 Author Share Posted September 8, 2013 Yeah, that's the sizes i'm using. I was advised to get 35 profile fronts and 30's on the back. Just checked again for a 245/30 - Circumference from is 2057.7mm vs 2072.5mm standard. Much closer. The tyres have already been bought unfortunately. Is it going to make much of a difference? Quote Link to comment Share on other sites More sharing options...
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