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Not what kind of tyre but what size of tyre? I'm currently running on 225/40/18 and find it under geared when travelling a fair distance. I'm thinking about going up to 245/45/18 to make it cruise a little better. The car in question is a B6 1.8t quattro 163 hp, I wonder if the 245/45/18 might be a step too far and if 245/40/18 might be a better compromise? Currently running on Eibach springs so it's 30mm lower if it needs to be taken into consideration, thanks in advance for any opinions.
Tire Size 225/40R18
mm inches
Tire
Width 225 8.86
Aspect
Ratio 40 -
Rim
Diameter 457 18.00
Sidewall
Height 90 3.54
Tire
Diameter 637 25.08
Circum-
ference 2000 78.74
Revolutions 500/km 806/mi
Tire Size 245/40R18
mm inches
Tire
Width 245 9.65
Aspect
Ratio 40 -
Rim
Diameter 457 18.00
Sidewall
Height 98 3.86
Tire
Diameter 653 25.71
Circum-
ference 2050 80.71
Revolutions 488/km 787/m
Tire Size 245/45R18
mm inches
Tire
Width 245 9.65
Aspect
Ratio 45 -
Rim
Diameter 457 18.00
Sidewall
Height 110 4.33
Tire
Diameter 678 26.69
Circum-
ference 2129 83.82
Revolutions 470/km 758/mi
Tire Size 225/40R18
mm inches
Tire
Width 225 8.86
Aspect
Ratio 40 -
Rim
Diameter 457 18.00
Sidewall
Height 90 3.54
Tire
Diameter 637 25.08
Circum-
ference 2000 78.74
Revolutions 500/km 806/mi
Tire Size 245/40R18
mm inches
Tire
Width 245 9.65
Aspect
Ratio 40 -
Rim
Diameter 457 18.00
Sidewall
Height 98 3.86
Tire
Diameter 653 25.71
Circum-
ference 2050 80.71
Revolutions 488/km 787/m
Tire Size 245/45R18
mm inches
Tire
Width 245 9.65
Aspect
Ratio 45 -
Rim
Diameter 457 18.00
Sidewall
Height 110 4.33
Tire
Diameter 678 26.69
Circum-
ference 2129 83.82
Revolutions 470/km 758/mi