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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Wheels and Tires -- Sponsored by The Tire Rack > Michelin Ps4 Tire Size Suggestions with 19" Wheels for xdrive w/ Dinan springs
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      07-29-2019, 06:58 PM   #1
f32_027
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Looking for someone to chime in on wheel gap differences in Tire Size for xdrive.

My car is lowered on Dinan springs and bumpstops - for those that know, it's a conservative drop - not that low at all.

The wheels are:
Front: 19x8.5 +35 et
Rear: 19x9.5 +40 et

The tires will be Michelin PS4.

For tire size, my preference is:
Front: 235/35/19
Rear: 275/30/19

This is an equal rolling diameter (for xdrive)

I have seen others use:
Front: 235/40/19
Rear: 265/35/19

Rolling diameter is (0.4%)

I'm not a huge fan of the above because the tires look a bit too beefy for me (making the wheels look smaller) and I prefer the wider 275 tire for the rear.

Another option is:
Front: 235/40/19
Rear: 275/35/19

Rolling diameter is (0.8%)

Again, this would mean a beefy tire, but it would be a 275 in the back, which looks nice.

Can someone explain what the wheel-gap differences will be with the above sizes?

Also, can someone explain what camber will be like in the rear?
I don't want to run an overly aggressive camber. I have done that in the past when my wheels were 20x10.5 et45 - tire size was: 275/30/20 - I didn't like the way it looked - tire was stretched, and the camber wore out the rear tires on the edges.

thanks for your help
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      07-31-2019, 02:42 PM   #2
f32_027
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There's gotta be some folks out there with their thoughts..! Anyone?

Research seems to say that if I go with, Front: 235/35/19 + Rear: 275/30/19, the diameter will be smaller than Front: 235/40/19 + Rear: 265/35/19. Car is lowered on dinan springs, but definitely want the wheel arches full.
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      07-31-2019, 07:11 PM   #3
thisismikeyb
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For xDrive most either run 235/265 or 245/275. I'm running 245/45r18 square which is the same diameter as 245/40r19. As for your rear wheel/tire selection, 9.5et40 is about 8mm further outward from 8.5et35 I run currently.

I have a few photos here of my current setup:

https://www.bimmerpost.com/forums/sh...php?p=25078893

I'm at most 1/4" higher on Eibach's than I was on my Dinan Springs.
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2014 328i xDrive M-Sport EBII--M-Sport Brakes w/Stoptech Pads--Full M-Performance Aero--Injen Intake--Active Autowerke Signature Exhaust--Millway Camber Plates on Bilstein B6 DampTronic w/Eibach Springs & M3 Bump Stops + Dinan Shockware--Summer Apex FL-5 w/ MP4S 245/45 18x8.5et35--Winter Apex EC-7 w/Pilot Alpin PA4 245/45 18x8.5et35--BavSound Stage 1+Ghost Subs
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