305 square ....

[Kelse92]

Originally Posted by Adrian g.

Your offset changed. If you started with 18x10 et19 and swapped to a 1 inch wider barrel, your new spec is 18x11 et32

This is extremely helpful thank you!
I was talking to him about this offset recently and was shocked to hear it was a 19. This makes a ton more sense

[berns]

Originally Posted by Adrian g.

Your offset changed. If you started with 18x10 et19 and swapped to a 1 inch wider barrel, your new spec is 18x11 et32

can you explain the math? generally curious. because i thought the offset of the wheel only had to do with the distance of the wheel face to the hub, and that didn't change with an inner barrel.

[CSBM5]

Originally Posted by berns

can you explain the math? generally curious. because i thought the offset of the wheel only had to do with the distance of the wheel face to the hub, and that didn't change with an inner barrel.

Offset should be the difference between the centerline of the wheel and the centerline of the hub face. If you add to the wheel width, you change the relative location of the wheel centerline.

[redpriest]

Originally Posted by nicksm3

Can be done, if it's a street car please don't don't it.

Track car only.

[nicksm3]

Originally Posted by redpriest

Track car only.

I'll say this as delicately as possible ....
DOOOOOOOO IT!!!!!!!

[redpriest]

Originally Posted by fsmtnbiker

You’ve seen my car with this setup, except I had 295 Hoosiers on it at Chuck instead of Yokos which fit easier. It will rub the front fender liner slightly. The rear just depends on how low you are and where your bumpstops are at. I ran et25 all around with a 3 or 5mm spacer up front to keep the wheel off the shock body. Lots of camber makes it easy... and the Yokos need all the camber anyways, so this works out well.

The offsets in this thread are all over the place, lol, so it makes it hard to figure out what's going to work for me. Just for clarification, you are saying 18x11" ET25 works fine with a spacer in front? I might not even have to use a spacer given the 5mm "free" offset I get with the Strom uprights. Hmmmmm.

[berns]

Originally Posted by redpriest

The offsets in this thread are all over the place, lol, so it makes it hard to figure out what's going to work for me. Just for clarification, you are saying 18x11" ET25 works fine with a spacer in front? I might not even have to use a spacer given the 5mm "free" offset I get with the Strom uprights. Hmmmmm.

That's because 99% of us just took a chance and tried to make things work. Just buy some wheels and tires and make them fit. There is a lot of room on this car.

MCS shock bodies and 5" main springs without a helper will put the perch above the tire, but with a helper you still have some room since it's so narrow. I ran 10.5" +25 with a 295 a052 up front with plenty of breathing room. I've seen people run 11s up front. I'd try mine but the Falken 315 is definitely too meaty.

[Kelse92]

Just pulled the trigger on 295/315 staggered A052's from tire rack... 18x11 et32 is the plan for the 315 on the rear it sounds like. Backup plan is to mount them on 18x10.5 et27
Should have them next week to confirm fit

295's are backordered...

[Adrian g.]

Originally Posted by Kelse92

Just pulled the trigger on 295/315 staggered A052's from tire rack... 18x11 et32 is the plan for the 315 on the rear it sounds like. Backup plan is to mount them on 18x10.5 et27
Should have them next week to confirm fit

295's are backordered...

315 A052's - that's a lot of tire!

(12.6" section width, 11.9" tread width)

[Kelse92]

Originally Posted by Adrian g.

315 A052's - that's a lot of tire!

(12.6" section width, 11.9" tread width)

Yeah! We'll see how it goes! I have some faith thanks to berns's test

[berns]

Originally Posted by Kelse92

Just pulled the trigger on 295/315 staggered A052's from tire rack... 18x11 et32 is the plan for the 315 on the rear it sounds like. Backup plan is to mount them on 18x10.5 et27
Should have them next week to confirm fit

295's are backordered...

That's going to be awesome. Make it happen!

[BigTee]

Originally Posted by Kelse92

Just pulled the trigger on 295/315 staggered A052's from tire rack... 18x11 et32 is the plan for the 315 on the rear it sounds like. Backup plan is to mount them on 18x10.5 et27
Should have them next week to confirm fit

295's are backordered...

Bumping an old thread.... did this work out for you?

[DrFerry]

Originally Posted by BigTee

Bumping an old thread.... did this work out for you?

Rears = 315/30R18 on 11X18 ET34mm Forgeline GA1R..
.

[BigTee]

Originally Posted by DrFerry

Rears = 315/30R18 on 11X18 ET34mm Forgeline GA1R..
.

Thank you. Car looks good.

How about the fronts? 295 on 11's work for track days?

[DrFerry]

Originally Posted by BigTee

Thank you. Car looks good.

How about the fronts? 295 on 11's work for track days?

No. Biggest front with stock fenders I know of is a 285/30R18 on a 10.5. Search the forums for that fitment or the aggressive fitment thread. Apex wheels has a good E9X wheel fitment thread as do Turner Motorsports.

[kolosy]

Originally Posted by DrFerry

No. Biggest front with stock fenders I know of is a 285/30R18 on a 10.5. Search the forums for that fitment or the aggressive fitment thread. Apex wheels has a good E9X wheel fitment thread as do Turner Motorsports.

I had 285/30s fit on an 18x11 in the front. They poked out a touch but didn’t rub on track. This was with ohlins though.

[DrFerry]

Originally Posted by kolosy

I had 285/30s fit on an 18x11 in the front. They poked out a touch but didn’t rub on track. This was with ohlins though.

Yeah the stock OEM front spring perch is wider than the Ohlins coil-overs.

[BigTee]

Originally Posted by DrFerry

No. Biggest front with stock fenders I know of is a 285/30R18 on a 10.5. Search the forums for that fitment or the aggressive fitment thread. Apex wheels has a good E9X wheel fitment thread as do Turner Motorsports.

Searching hasn't yielded any track specific results. Most discussion has been about street or show cars, hence my question focused on track driving. Fitting and going over a speed bump is different than hitting track curbing at over 100mph.


285 on a 10.5 would be nice, but none of the super 200's we should care about come in that size.

[kolosy]

Originally Posted by BigTee

Searching hasn't yielded any track specific results. Most discussion has been about street or show cars, hence my question focused on track driving. Fitting and going over a speed bump is different than hitting track curbing at over 100mph.


285 on a 10.5 would be nice, but none of the super 200's we should care about come in that size.

the RE71RS comes in that size...

[pirategenes]

Originally Posted by kolosy

the RE71RS comes in that size...

Supercar 3R does too...

I ran 295/30/18 square on track and only had slight rubbing in the front on hard sweepers and some curbing. Hoping to correct that this off-season with some suspension changes and I think no rubbing should be possible.

[DrFerry]

Originally Posted by BigTee

Searching hasn't yielded any track specific results. Most discussion has been about street or show cars, hence my question focused on track driving. Fitting and going over a speed bump is different than hitting track curbing at over 100mph. 285 on a 10.5 would be nice, but none of the super 200's we should care about come in that size.

.
APEX E9X M3 Track Wheel Fitment - Link:
https://apexwheels.com/fitment-guide...hardcore-track.
.
Turner Wheel Fitments E9X M3 - Link:
https://www.turnermotorsport.com/BMW...t-alloy-wheels
.
Rear Tire Candidates for 11X18 and/or 10.5X18 rim width
Tire Rack 315/30R18 Search Link: (yields 19 results) use 11X18
https://www.tirerack.com/tires/TireS...erformance=ALL
.
Tire Rack 295/35R18 Search Link: (yields 12 results) use 10.5 or 11X18
https://www.tirerack.com/tires/TireS...erformance=ALL
.
Tire Rack 295/30R18 Search Link: (yields 22 results) use 10.5X18
https://www.tirerack.com/tires/TireS...erformance=ALL
.
Tire Rack 285/30R18 Search Link: (yields 17 results) use 10.5X18
https://www.tirerack.com/tires/TireS...erformance=ALL
.
The rear tire solutions above all have different outer diameters which affects gearing. So keep that in mind. A 285/30R18 front tire has been run on the track by various members using a 10.5X18 rim but that was done using coil-overs if I recall correctly. I don't know the offset (ET) that was used.
.
The Tire Talk Mega Thread Link:
https://www.m3post.com/forums/showthread.php?t=1916791
.
APEX wheel fitment screen shots.
.

[danvitmon]

I run an 18x11+25 275/35 square on my E90 M3 dual purpose car. 8mm front spacer. Zero issues with rub besides front liners but those self clearanced when turning. Data has shown that a smaller tire on a wider wheel is faster than a wider tire on a wider wheel. I have run 295/35 RE71RS as well with no issue. MCS 1ways, 700F, 600R coilover rear, both with helpers. Very low in the rear but front is "kind of" high, even though I have the front a few mm lower than the rear.

~3730lbs with 180lb driver. F -3.0 0 total, R -1.8 +14 total toe in, 49.7 Cross, LF113/RF115/RR121/LR119 RH at metal next to jackpad, Front hotchkis bar at 3 no rear. DON'T get hotchkis, rear ended up destroying the axles, cut the bar out because I wasn't about to drop the subframe again to put the stock in, will do when I have the time.