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245/40/18 Tyres
Posted: Mon Jan 30, 2006 3:16 pm
by JampoTT
Will this make any difference to handling / speed reading / acceleration or will it be negligible?
Being offered a good deal - some new 18" wheels, complete with these tyres (Toyos)... Its a LOT more money to get 235/40/18 Goodyear F1s.
RE: 245/40/18 Tyres
Posted: Mon Jan 30, 2006 7:19 pm
by shineydave
the 245/40/18 is 2.5cm bigger around the circumference so the acceleration would be reduced ever so slightly, wouldn't have thought you'd notice it actually.
245/40/18 - 205.3cm circumference
235/40/18 - 202.8cm circumference
if my calculations are correct the speedo would underread by about 1.2% but to be fair mine overreads by 10% anyway from the factory so again, not an issue.
RE: 245/40/18 Tyres
Posted: Wed Feb 01, 2006 11:22 pm
by CliveH
Some observations/questions :-
Wider tread (10mm per wheel) = better grip but more drag?
Slightly higher profile (4mm according to my calcs) = slightly softer ride??
Just tell me to shut up if I'm talking
Posted: Sat Apr 01, 2006 9:36 pm
by razor
I am assuming that the OEM alloys on the S4 B6 are 8.5x18. Fitting 245's to your car may introduce tramlining and limit the ability of the car's handling characteristics.
Posted: Sat Apr 01, 2006 10:35 pm
by CliveH
The OEM Ronal alloys on the S4 B6 are 8Jx18 (standard tyres 235/40)