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found these ever heard of em?
Silverstone FTZ sport
Tyre Size
Load
Speed
Index
Rim Width
Max
Load
Max
Speed
Section
Wdith
Overall
Diameter
Static Load
Rolling
Circum'ce
Max
Pressure
R
P
Single
Dual
[km/h]
[mm]
[mm]
[mm]
[mm]
[psi]
[kPa]
215/35ZR17
79W
7.5
7.0-8.5
437
-
270
218
582
270
1764...
Thanks,
I am in Oz, we have 195/50 R15 here as standard on the sport which has a circumference of approx 1810mm
(215/35 R17 C=1830 so only about 1% out)
If I go for a 215/40 R17 C= 1879 or about 5% bigger.
Won't this mess with the speedo and also slow down the accelaration? i.e. slower...