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View Full Version : Tyres size for 18" wheels on a bmw z4 coupé ?

hart07
07-14-2008, 04:44 PM
What is the good size for tyres to put 18" wheels on a bmw z4 coupé 3.0L ?
in front is 225x45x18 ?
rear : 245 x40x18 ?
thanks for your reply
jsc
07-14-2008, 07:36 PM
What is the good size for tyres to put 18" wheels on a bmw z4 coupé 3.0L ?
in front is 225x45x18 ?
rear : 245 x40x18 ?
thanks for your reply
Those tyre sizes are close to the ///M sizes (225/45-18 front, 255/40-18 rear) the correct stock size for the 3.0i/si is 225/40-18 front, 255/35-18 rear, but the ///M sizes should work with a slight loss in acceleration
hart07
07-15-2008, 05:23 AM
ok thanks
GH41
07-15-2008, 03:42 PM
Like jsc said-I RUN 225/40 & 255/35 on an 07 roadie with 18x8.5 et43 & et36. GH
hart07
07-16-2008, 08:04 PM
is possible to put
225x45x18 in front of
245x40x18 rear
in 18" et38
is ok or problem for the technic control ?
thanks
jsc
07-17-2008, 05:53 PM
Should fit with that ET. The rear tyres are about 6.5mm smaller than the front tyres, so about 1% smaller in diameter. The ABS & DSC should normally be OK up to about 3% of diameter difference.
hart07
08-07-2008, 11:40 PM
wich ET i have to put on 18" rims

if i want :
Front 8,5 x 18 ET 38 with 225/40 ZR 18 and
Rear 9,5 x 18 ET 41 with 255/35 ZR 18

is ok for my car but if i take the same size in rims and tyre but with ET 35 for front and ET 30 for rear
is always ok ?
thanks