[l-e-v-a-n]

Hello. I own 2014y F32 435i (RWD), currently car has 400m style 18" wheels but now I want to go for 442m, I've found person who is selling style 442m 19", but problem is that he has 4pcs of 8.5J. so all of them are rear ones.
now I have question, ofc I will use 255/35 for rear tires but:
1) is it okay to use 8.5J ET47 (OEM for front is 8J ET36) also for front tires? will it cause any problem in future?
2) which size is better to use for them, 225/40 (I know its OEM size but I mean for 8.5J front) or 235/40 ? :
3) I'm currently using spacers front 12mm, rear 15mm, and if I put 8.5J 235/40 what is better: should I keep using front spacers or remove them?

THANKS A LOT!

[alohasurftoad]

12.5mm spacer up front with 8.5 ET47 will put it at ET34.5

on the 8.5", do 255/35/19 and you can rotate however you want.

[l-e-v-a-n]

Originally Posted by alohasurftoad

12.5mm spacer up front with 8.5 ET47 will put it at ET34.5

on the 8.5", do 255/35/19 and you can rotate however you want.

first of all, thanks for reply.

hmm, im a bit confused. so you are saying its better to go for 255/35/19 also for front? despite its RWD vehicle?

[alohasurftoad]

Originally Posted by l-e-v-a-n

hmm, im a bit confused. so you are saying its better to go for 255/35/19 also for front? despite its RWD vehicle?

yes. 255 square will still help a RWD handle better in the corners by reducing understeer with more front grip.

here's an x-drive with the same things done.
https://f30.bimmerpost.com/forums/sh....php?t=1906246

if you don't mind understeer and rather have the staggered setup you can use 225/40/19(stretched) or 235/40/19(light stretch) if you desire.

personally, i'd still run at least 245/35/19 on the 8.5" up front. in which case you might as well get 255/35/19.

FWIW since 235/40/19(26.4") is taller than 255/35/19(26.0") it creates a slight reverse rake diameter stagger. somewhat unsightlier than level or forward rake.
.