[Curacao]

My drivers side rear Goodyear F1 265/40/18 went flat and it was also worn out so i got
a deal on (2) Dunlop Sportmax 275/40/18 which is also the standard tire for the new R8 and
it fits perfectly. In front i kept the Dunlop Direzza 245/45/18.

Regards,

Eddie

 

[Quadcammer]

you realize this will mess with your speedometer right?

 

[jamesn]

This can mess with your speedo and cruise control apparantly.

However, check out this website though,

Tyre_Calculator

the 245/265 set up has a difference in circumferance of

245:2129mm
265:2102mm

so 27mm or just over 1" in overall wheel circumferance in favour of the fronts.
Despite being wider the rears are actually smaller in the standard set up, and turn more often than the fronts as a result.

if you change it to 245/275

245:2129mm
275:2127mm

being a difference of 2mm and is a lot closer to the size of the fronts and only 25mm/1" over the 265 .

The difference between the 265 and 275 would be a speedo error of 1.18% so as long as your not getting any cruise errors the difference on your speedo wont even be noticeable, in the next 100,000 miles you'll be out by about 1000 miles.

But, this only applies to new tyres as they wear down the circumferance will reduce, meaning that no speedo will ever give a truly accurate reading of the mileage or speed, on any car.

 

[Curacao]

I calculated the difference in sizes front rear tires and i don not see anything wrong with the speedometer the only thing can mess it up if you go wider in the fronts which i kept it as the specification for sport package in the catalog.

Thanks,

Eddie

 

[Red.]

Those are 275/40-18 & 245/45-18's . . .

They work out just fine .

Red, *<{)-

 

[Curacao]

Yeah and they look good too.

Eddie