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      05-03-2021, 02:16 PM   #1
RSXDC5
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I've been getting a lot of interest in how I fit my 305/30/19 fronts and 325/30/19 rears...Here is what you need in order to achieve this fitment:

Fronts: 305/30/19
19x10.5 +20 (I add in a 5mm spacer for an effective +15 offset on track)
Get a heatgun, via the heating, make minor modifications to the fender liner to push it back/away from from the tire in a few spots for clearance
-3.1 to -3.2 camber
If on coilovers, you need a 5in front spring (helper spring optional) so the spring assembly sits above the front tires (vs adjacent to it)
Don't slam the car
KW coilovers may not work with their reduced inner clearance

Rears: 325/30/19
19x11.5 +44 (+45 will also work)
No fender modifications necessary
-2.1 camber, don't go crazy here, around -2.1 is the sweetspot
Don't slam the car (wont be needed with a 325)

Comments:
A 305 tire on a 10.5in front wheel is fine if you run a tire with a stiff sidewall.
I use 0 toe up front and 0.07 toe in PER SIDE on the rear.
Soooooo much mechanical grip on track.
The 325 rear allows for a higher (usable) power output on track/street
You'll need custom spec'd wheels in my specs above, Signature/BC Forged was my pick.

Enjoy!
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      05-03-2021, 03:51 PM   #2
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For the fronts, will a 305 fit with just lowering springs?

Also do you have any photos of your setup? Thanks for the Info
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      05-03-2021, 04:12 PM   #3
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Quote:
Originally Posted by F80RN View Post
For the fronts, will a 305 fit with just lowering springs?

Also do you have any photos of your setup? Thanks for the Info
The max front size tire I fit before going to MCS coilovers was a 295/30/19 PS4S
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      05-03-2021, 04:29 PM   #4
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Great info, thank you for sharing! Adding these two other threads for more fitment reference:

305/30/19 Front:
https://f80.bimmerpost.com/forums/sh....php?t=1458882

325/30/19 Rear:
https://f80.bimmerpost.com/forums/sh....php?t=1012136
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      05-03-2021, 06:30 PM   #5
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What brand are the tires you are running? I know brand can make a difference as far as the sizes.
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      05-03-2021, 06:41 PM   #6
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Quote:
Originally Posted by chetrickerman View Post
What brand are the tires you are running? I know brand can make a difference as far as the sizes.
Right now the Nankang AR-1 are mounted (incredible track tires!) & these run pretty wide. I have a pair of unmounted 305/30/19 PS4S & 305/30/19 AR-1 and can compare sizes for u as a reference point
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      05-03-2021, 07:02 PM   #7
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Quote:
Originally Posted by RSXDC5 View Post
Right now the Nankang AR-1 are mounted (incredible track tires!) & these run pretty wide. I have a pair of unmounted 305/30/19 PS4S & 305/30/19 AR-1 and can compare sizes for u as a reference point
Excellent! Yes, it would be nice to know if the two brands are the exact same size
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      05-05-2021, 04:16 PM   #8
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305/30/19 Michelin PS4S vs 305/30/19 Nankang AR-1
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      05-05-2021, 04:18 PM   #9
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295/30/19 Michelin PS4S vs 305/30/19 Nankang AR-1
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      05-05-2021, 05:39 PM   #10
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Awesome! Great info!

I need some more tire upfront, as i'm only running 265/35/19 and 305/30/19 RE71Rs
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      05-05-2021, 06:20 PM   #11
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Quote:
Originally Posted by sly1types View Post
Awesome! Great info!

I need some more tire upfront, as i'm only running 265/35/19 and 305/30/19 RE71Rs
Ya man, do it! Love your front lip btw, will be ordering that myself pretty soon here.
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      05-05-2021, 06:56 PM   #12
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Originally Posted by RSXDC5 View Post
Ya man, do it! Love your front lip btw, will be ordering that myself pretty soon here.
Thanks! good luck getting ahold of MK Motorsport the manuafacute, but MS Motorsport had them in stock and they are very responsive, i spoke with Martin.

https://www.raceparts.biz/gt4-f8-m3-...bon-fibre.html
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      05-05-2021, 11:31 PM   #13
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Quote:
Originally Posted by RSXDC5 View Post
The max front size tire I fit before going to MCS coilovers was a 295/30/19 PS4S
Ahh so this is how you are able to get away with the +15 offset...
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      05-06-2021, 12:04 AM   #14
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Quote:
Originally Posted by F80Speed77 View Post
Quote:
Originally Posted by RSXDC5 View Post
The max front size tire I fit before going to MCS coilovers was a 295/30/19 PS4S
Ahh so this is how you are able to get away with the +15 offset...
When I ran the 295/30/19's, I was on about -3 camber and no 5mm spacer...so I was +20 offset.

To be clear my setup of 19x10.5 +20 will work as is with oem or MCS dampers. I only use the 5mm spacer on track when I am flexing my tire sidewalls in corners potentially reducing inner clearance...just being extra safe.
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      10-15-2022, 05:15 AM   #15
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I am afraid of running a 265/35/19 front and 305/30/19 rear because of the same overall diameter and MDM intervention and was thinking about going bigger in the rear. Maybe not 325/30/19 but 315.
Wouldn’t a 315/30/19 Michelin PS4S be closer to OE ratio? And why is nobody running them? I always see 305/30/19 everywhere and don‘t understand it as on German Autobahn I think I could get in trouble at high speeds with ASR intervening.

A custom spec 11.5x19 should be good for a 315/30/19 aswell. What do you think?
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      10-15-2022, 04:01 PM   #16
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Quote:
Originally Posted by valenciaga_m4 View Post
I am afraid of running a 265/35/19 front and 305/30/19 rear because of the same overall diameter and MDM intervention and was thinking about going bigger in the rear. Maybe not 325/30/19 but 315.
Wouldn't a 315/30/19 Michelin PS4S be closer to OE ratio? And why is nobody running them? I always see 305/30/19 everywhere and don't understand it as on German Autobahn I think I could get in trouble at high speeds with ASR intervening.

A custom spec 11.5x19 should be good for a 315/30/19 aswell. What do you think?
Oem tire diameter delta front to rear is 0.6" w/ 437M wheels

A 285/30/19 and a 315/30/19 is a 0.7" delta front to rear.

A 265/35/19 and a 315/30/19 is a 0.2" delta front to rear.

A 295/30/19 and a 315/30/19 is a 0.5" delta front to rear.

The 285/315 combo is probably best for you, step up to a 295 if you track and are ok running some front camber via camber plates. The 285 will require at least a 10in wide wheel up front.
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      12-20-2022, 08:10 PM   #17
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any thoughts on if the rear would fit a 325/30/19 R888R with 19x11 +44 setup without rubbing? here's the kicker though, i need to run minimal camber, like OEM spec at max, since i'm trying to increase straight line grip. car is lowered, but not too crazy. m4 with no rear passengers ever.
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      01-08-2023, 12:28 AM   #18
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Quote:
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any thoughts on if the rear would fit a 325/30/19 R888R with 19x11 +44 setup without rubbing? here's the kicker though, i need to run minimal camber, like OEM spec at max, since i'm trying to increase straight line grip. car is lowered, but not too crazy. m4 with no rear passengers ever.
The available grip with a 325 (or even a 315) will outweigh any camber related loss of grip like you are worried about. So rest easy there. A 325 is possibly with “sporty” rear camber, and is a bit too wide of a tire for a 19x11. A 315 is a better match.

Do keep in mind the r888r are noisy, loud, and only have “good” grip once up to temp. Nankang AR1 are a bit less noisy/loud, and have a touch more grip. That said, surprisingly, my current 315/30/19 Michelin PS4S have more grip in street or sporty driving scenarios than r888r/AR1, and the PS4S is a much better overall tire. If you simply want grip for the 1/4 mile, the Mickey Thompson street et variants are solid choices, along with the Toyo fr.

Hope that helps!

Oh also, definitely get the SPL rear toe arms w/ eccentric lockout. This really really helps you control the car under acceleration/power…no more floaty feeling!
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      01-11-2023, 08:58 PM   #19
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Quote:
Originally Posted by RSXDC5 View Post
The available grip with a 325 (or even a 315) will outweigh any camber related loss of grip like you are worried about. So rest easy there. A 325 is possibly with “sporty” rear camber, and is a bit too wide of a tire for a 19x11. A 315 is a better match.

Do keep in mind the r888r are noisy, loud, and only have “good” grip once up to temp. Nankang AR1 are a bit less noisy/loud, and have a touch more grip. That said, surprisingly, my current 315/30/19 Michelin PS4S have more grip in street or sporty driving scenarios than r888r/AR1, and the PS4S is a much better overall tire. If you simply want grip for the 1/4 mile, the Mickey Thompson street et variants are solid choices, along with the Toyo fr.

Hope that helps!

Oh also, definitely get the SPL rear toe arms w/ eccentric lockout. This really really helps you control the car under acceleration/power…no more floaty feeling!
Thanks for the feedback! I’m currently running 285/30/20 R888R, which replaced my PS4. I don’t really find the R888R noisey and I find them surprisingly quite comfortable. In terms of straight line grip, the R888R are vastly superior, although they do cool down quickly in cold temps. The PS4, while a great tire, were like riding on banana peels at any temp (car makes 700whp+). Oh, I already have the SPL toe links with lockout.

The Nankangs weren’t on my radar. Any idea how they handle on the road and actual treadware compared to the R888R? What I’m really looking for is something that can improve my grip on acceleration, not kill me if it happens to rain, and will last a “decent” amount of miles (maybe a few thousand?).

Worst case I can just do 305/30/19 R888R with my new wheels and it should be a good improvement over my current setup.

Edit: Some quick research tells me the AR1 are terrible in wet, much worse than even Cup 2s, which is saying a lot. I don’t drive the car in the rain, but I am in Seattle so it’s inevitable. Do you have any experience with these in the wet or cold? No interest in pushing the car in the wet, just want to be able to drive safely without hydroplaning. It’s also cool/cold here at least 6 months of the year too.
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      01-12-2023, 02:14 PM   #20
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Quote:
Originally Posted by astris View Post
Thanks for the feedback! I’m currently running 285/30/20 R888R, which replaced my PS4. I don’t really find the R888R noisey and I find them surprisingly quite comfortable. In terms of straight line grip, the R888R are vastly superior, although they do cool down quickly in cold temps. The PS4, while a great tire, were like riding on banana peels at any temp (car makes 700whp+). Oh, I already have the SPL toe links with lockout.

The Nankangs weren’t on my radar. Any idea how they handle on the road and actual treadware compared to the R888R? What I’m really looking for is something that can improve my grip on acceleration, not kill me if it happens to rain, and will last a “decent” amount of miles (maybe a few thousand?).

Worst case I can just do 305/30/19 R888R with my new wheels and it should be a good improvement over my current setup.

Edit: Some quick research tells me the AR1 are terrible in wet, much worse than even Cup 2s, which is saying a lot. I don’t drive the car in the rain, but I am in Seattle so it’s inevitable. Do you have any experience with these in the wet or cold? No interest in pushing the car in the wet, just want to be able to drive safely without hydroplaning. It’s also cool/cold here at least 6 months of the year too.
A couple notes:

R888r get noisy over time
You didn’t mention 700whp lol
Ps4s do have more grip in street driving cold weather scenarios vs an r comp
As it’s a track tire, Ar1 have stiff sidewalls so ride quality suffers
Toyo rr doesn’t have tread but will work will with your power level
Not sure if any tire will do all you are asking…holding 700whp, good at varying temps, good in rain.
Maybe a Hoosier wet tire??
Cup2’s are the worst, terrible terrible grip until 85-90° at min
I would personally move away from 20’s for max tire width fitment, the OD is just too much.
You probably need a custom rear wheel to enable proper maximum tire fitment
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      01-12-2023, 04:22 PM   #21
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Quote:
Originally Posted by RSXDC5 View Post
A couple notes:

R888r get noisy over time
You didn’t mention 700whp lol
Ps4s do have more grip in street driving cold weather scenarios vs an r comp
As it’s a track tire, Ar1 have stiff sidewalls so ride quality suffers
Toyo rr doesn’t have tread but will work will with your power level
Not sure if any tire will do all you are asking…holding 700whp, good at varying temps, good in rain.
Maybe a Hoosier wet tire??
Cup2’s are the worst, terrible terrible grip until 85-90° at min
I would personally move away from 20’s for max tire width fitment, the OD is just too much.
You probably need a custom rear wheel to enable proper maximum tire fitment
With some additional searching, I do see some AR-1 owners stating no issues with normal driving in the rain and good traction in the cold. Seems like the heavier vehicle weight helps with that. They are looking pretty favorable right now. If they do run a bit narrow, maybe I can even fit the 325s. Will start with 305s first though and stick to around 1-1.5 negative camber.

I'll be switching to 19x9.5 and 19x11 setup. Overall my goals I think are pretty realistic:

Improved dry grip over my current 285/30/20 R888R
Can drive safely in the rain, within normal limits, if I have to (rare as it's just my "fun" car)
Good grip in cool/cold weather with some "encouragement"
Last a few thousand miles

My biggest issues with the R888R I have now are I need more tire, they are slow to heat up, and they cool down very quickly. No real complaints with noise or comfort. With whatever setup I have, I don't expect anything crazy like hooking up all the time. I'd be pretty excited just to hook up in 2nd at all. I may add SPL rear traction links as well.

Oh, and I can run 5.6-5.8 60-130 routinely on the current 285/30/20 in the cold. It just takes some practice and pre-pull, rolling 3rd gear burnout. That's a big part of what I'm hoping to resolve. lol.
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      04-29-2023, 10:21 AM   #22
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This is a great post

Do you think a 315/30/19’ on a 10.5 et37 will work in the rear , I am lowered on macht schnell springs.
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