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Just worked it out again based on the ACTUAL front OEM tyres. Basically only have 2 choices really:
Stock is
225/45 fronts RD 659.7mm
255/40 rears RD 661.2mm
Difference of +1.5mm front to rear
CHOICE 1
235/40 fronts RD 670.6mm - Arch gap decrease by 11mm. Speedo -1.6%
265/35 rears RD 668.1mm - Arch gap decrease by 7mm. Speedo -1%
Difference of -2.5mm RD
CHOICE 2
245/35 fronts RD 654.1mm - Arch gap increase by 5.6mm. Speedo +0.9%
275/30 rears RD 647.6mm - Arch gap increase by 13.5mm. Speedo +2.1%
Difference of -6.5mm RD
My main reason for wanting to lower is purely to get rid of the crap rear springs the car comes with. No one does like for like replacements & the closest to stock is eibach -10mm rear & -20mm front.
Prefer the specs on choice 1. Closest to OEM spec but concerned the decrease in the arch gap, between tyre & fender, is going to be a problem when I lower it?
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