Are these wheels gonna to fit?

[m3f_nickanas]

Board, please I would appreciate some input before I drop big bucks (Euros)



My questions are:

1. has anyone tried fitting the following size wheels/tires combo on their vehicle.

Front, 225/45/18x8.0J if my math is correct that's 25.97" diameter

Rear, 255/40/18x9.0J 26.03" diameter

(incidentally, the above are the exact size for the stock E46 M3).

Now, if we assume that stock E36 M3 came with 225/45/17Front and 245/40/17Rear, that's 24.97"/24.71" (front/rear).



2. This represents a +3.85%/+5.05% increase in tire diameter. Will this screw up your tach/speedometer readouts? (there's a rule of thumb that says that if you stay within +/-5.0% you're OK).



3. Does you contact patch increase with the larger wheel? What's the impact performance wise? (help from the racers :bow: greatly appreciated)

[m3f_M3Trav]

Do you know what the offset on the wheels is? This is an important number in terms of fit. I'm guessing those will not fit but I don't know for sure.



Tire patch: That change in diameter will make a very small difference in tire patch. I think tire pressure will make a bigger difference.



Rotating mass: Depending on your wheels, you are likely to increase the rotional inertia of your wheels/tires. That has detrimental effects in almost every way (more mass to brake, more mass to accel, more unsprung weight).

[m3f_Sirius_880bd69485]

With the way my rims are now, see pic below, I was forced to use



225/40 r18s all around. This being because my rims are 9 across, and they stick out some. I prob could have barley fit 235/35 R18's on the back, however there would have been less than 1mm of space between the tire and the 1/4. Anything wider will rub.

[m3f_nickanas]

Thanks for your inputs.



M3Trav, the offset is 35mm. Who knows if they will fit. I guess the only way to find out is to go to the wheel store and try them on. But even if they fit, they may screw up the ride. :???:





Dark Sirius, one way to make 'em fit is to roll the fender lip. But I dont know if you're willing to go that way.

[m3f_stephen]

hi,



Just for reference, i have 225/40/18 on the front and 255/35/18 on the rear without any problems. i think having the right offset will be very important.

[m3f_Drifter_23d8df4bc6]

Ah i have 235/40/17 and I run them all the way around i think.