My 295/30/18 SQUARED setups

[attkspec]

I've ran several staggered setups, from stock 437Ms and 666Ms to 19x9.5 and 19x10.5 Rays ZE40s and TE037s, but seemed to struggle with understeer with those setups. I've since moved to 18x10.5 +22 squared with 295/30/18 tires. This is not a setup that I see commonly run, so I thought I'd share my own two cents.

Suspension:
- Swift lowering springs (stock EDC struts)
- Millway camber plates

Camber: -4 F, -3 R
Toe: 0 F, 0 R

A 12mm spacer is being run up front to allow the wheel to clear the factory strut.

Proven tire setups that don't rub:
- 295/30/18 Yokohama Advan A052
- 295/30/18 Bridgestone Potenza RE-71RS

There is a bit of poke with these tire setups. It looks like it would rub, but under compression the wheels camber in just enough to clear the fenders.

Next, I will try the Kumho V730 in the max size, 275/35/18, which will 100% clear, but also allow me to run less camber. The current amount of camber is not maximizing the full tire width, but is required to clear the fenders.

Hope this information helps!

A052:


RE-71RS:

[RugbyBro]

You should check this thread when you have a chance.

https://f80.bimmerpost.com/forums/sh....php?t=1555419

If you're up for new wheels, you should give 10.5et34-36 a try. Much easier fitment in the rear and easy to fit in front w/ spacer.

[M3SQRD]

Definitely check out the thread RugbyBro linked. It has all of the numerous setups people have found to work well on the f8x.

You’re running excessive rear camber, along with front camber that’s on the high side, just to run your wheels with aggressive offsets. I bet the front tire will work better with -3.25 deg to -3.5 deg. The rear should be closer to -2.0 deg. You can definitely get more out of the tires with less front and rear camber.

You have to run a 10.5et10 with 295 tire to clear the front strut? I know the stock strut creates a clearance issue but I thought it wasn’t that bad. The a052 runs a bit on the wide side - is it the tire sidewall or the strut/spring that causes the interference issue?

[attkspec]

Originally Posted by RugbyBro

You should check this thread when you have a chance.

https://f80.bimmerpost.com/forums/sh....php?t=1555419

If you're up for new wheels, you should give 10.5et34-36 a try. Much easier fitment in the rear and easy to fit in front w/ spacer.

Thanks! Appreciate the insight.

I've looked at that forum before but when purchasing my BBS, that offset is not very common/readily available.

[attkspec]

Originally Posted by M3SQRD

Definitely check out the thread RugbyBro linked. It has all of the numerous setups people have found to work well on the f8x.

You’re running excessive rear camber, along with front camber that’s on the high side, just to run your wheels with aggressive offsets. I bet the front tire will work better with -3.25 deg to -3.5 deg. The rear should be closer to -2.0 deg. You can definitely get more out of the tires with less front and rear camber.

You have to run a 10.5et10 with 295 tire to clear the front strut? I know the stock strut creates a clearance issue but I thought it wasn’t that bad. The a052 runs a bit on the wide side - is it the tire sidewall or the strut/spring that causes the interference issue?

I agree, the camber is excessive and I would definitely prefer to run less camber. Coilovers and full arms should help.

The wheel and sidewall don't clear the strut itself. Here are some photos of the clearance with a 12mm spacer.

[MineralWhiteF80]

Originally Posted by attkspec

I agree, the camber is excessive and I would definitely prefer to run less camber. Coilovers and full arms should help.

The wheel and sidewall don't clear the strut itself. Here are some photos of the clearance with a 12mm spacer.

It seems you could run less than a 12mm spacer and still have at least 3mm of strut/tire clearance, unless the picture is deceiving. That should let you run less camber and get the tire to run flatter on the road.

BTW, is that a VOLTEX rear wing? if not, what is it?

[M3SQRD]

Originally Posted by attkspec

I agree, the camber is excessive and I would definitely prefer to run less camber. Coilovers and full arms should help.

The wheel and sidewall don't clear the strut itself. Here are some photos of the clearance with a 12mm spacer.

Attachment 3415362
Attachment 3415363

Originally Posted by MineralWhiteF80

It seems you could run less than a 12mm spacer and still have at least 3mm of strut/tire clearance, unless the picture is deceiving. That should let you run less camber and get the tire to run flatter on the road.

BTW, is that a VOLTEX rear wing? if not, what is it?

I agree 100% with MineralWhiteF80. You have a huge amount of radial clearance! It also looks like the spring seat is at the same height, or higher, than the inner tire tread blocks but the spring seat moves up/down with the tire so dynamic clearance and static clearance are the same. As MineralWhiteF80 mentioned, you only need a min of 3 mm of clearance between the strut/spring and the tire. I’d try a 5 mm or 7 mm spacer. I’m a fan of Turner’s spacers with the integrated hub extender. It looks like they don’t offer the 7.5 mm version (I might have one I’m not using, if you’re interested?). Here’s the 5 mm version:
https://www.turnermotorsport.com/p-5...f82-m4-f87-m2/

[RugbyBro]

Originally Posted by attkspec

Thanks! Appreciate the insight.

I've looked at that forum before but when purchasing my BBS, that offset is not very common/readily available.

Aint that the unfortunate truth! The bigger volume manufacturers are more concerned with maximizing fitment across generations rather than the most proper chassis specific offsets. The apex guide that so many seem to reference doesn't even mention the +33-36 offset range as the optimal square fitment.

[attkspec]

Originally Posted by MineralWhiteF80

It seems you could run less than a 12mm spacer and still have at least 3mm of strut/tire clearance, unless the picture is deceiving. That should let you run less camber and get the tire to run flatter on the road.

BTW, is that a VOLTEX rear wing? if not, what is it?

There's plenty of clearance from the spring perch to the tire, but I'm worried about the sidewall flex under hard load rubbing on the strut. I'm sure I could go down. 12mm was just what I had readily available.

Also it's a Voltex replica with genuine Laptorr stands. I didn't want to wait 18 months haha.

[attkspec]

Originally Posted by M3SQRD

I agree 100% with MineralWhiteF80. You have a huge amount of radial clearance! It also looks like the spring seat is at the same height, or higher, than the inner tire tread blocks but the spring seat moves up/down with the tire so dynamic clearance and static clearance are the same. As MineralWhiteF80 mentioned, you only need a min of 3 mm of clearance between the strut/spring and the tire. I’d try a 5 mm or 7 mm spacer. I’m a fan of Turner’s spacers with the integrated hub extender. It looks like they don’t offer the 7.5 mm version (I might have one I’m not using, if you’re interested?). Here’s the 5 mm version:
https://www.turnermotorsport.com/p-5...f82-m4-f87-m2/

Is 3mm the minimum optimal clearance needed to be accounted for, for sidewall flex? That's what I'm mainly worried about, although I wouldn't be against going to a smaller spacer when I tried the 275/35 Kumhos.

I might be interested in your spare one. Let me know.

[M3SQRD]

Originally Posted by attkspec

Is 3mm the minimum optimal clearance needed to be accounted for, for sidewall flex? That's what I'm mainly worried about, although I wouldn't be against going to a smaller spacer when I tried the 275/35 Kumhos.

I might be interested in your spare one. Let me know.

I had a tire strut interference issue a few years back and I found 3 mm of clearance was sufficient to prevent contact/rubbing. I have used 3 mm as the min required since then without issue. Calling SYT_Shadow to get his recommendation on min inner tire clearance.

I’ll look for the Turner 7.5 mm spacer with integrated hub extender. Actually, I have both 5 mm and 7.5 mm Turner spacers I’m not using.

[Track/S]

It's been a long time since I've seen an M4 that looks so sharp, the rear spoiler is incredible, you can use adjustable arms on the front and thus reduce the aggressive camber.

If the car were mine, this is what I would do without hesitation because otherwise it is perfect in all aspects.

[SYT_Shadow]

Originally Posted by M3SQRD

I had a tire strut interference issue a few years back and I found 3 mm of clearance was sufficient to prevent contact/rubbing. I have used 3 mm as the min required since then without issue. Calling SYT_Shadow to get his recommendation on min inner tire clearance.

I’ll look for the Turner 7.5 mm spacer with integrated hub extender. Actually, I have both 5 mm and 7.5 mm Turner spacers I’m not using.

3 is a good rule of thumb. Sometimes I've run less and then seen the tire rub marks on the strut.

It's helpful to have 1, 2, 3, 5, 7 mm spacers when trying to push the envelope with fitments

[M3SQRD]

Originally Posted by SYT_Shadow

3 is a good rule of thumb. Sometimes I've run less and then seen the tire rub marks on the strut.

It's helpful to have 1, 2, 3, 5, 7 mm spacers when trying to push the envelope with fitments

I know ECS sells/rents a spacer fitment kit now but I’d assembled my own kit long before ECS did. Never thought about selling them to other people. At the time, I thought I was the only one with a serious wheel problem, at least that’s what my wife called it. I told her we both a “shoe” problem with the difference being mine went on cars, hers went on feet

[attkspec]

Originally Posted by Track/S

It's been a long time since I've seen an M4 that looks so sharp, the rear spoiler is incredible, you can use adjustable arms on the front and thus reduce the aggressive camber.

If the car were mine, this is what I would do without hesitation because otherwise it is perfect in all aspects.

Thank you! That is going on my list of things to do. I appreciate the insight!

[attkspec]

Originally Posted by M3SQRD

I had a tire strut interference issue a few years back and I found 3 mm of clearance was sufficient to prevent contact/rubbing. I have used 3 mm as the min required since then without issue. Calling SYT_Shadow to get his recommendation on min inner tire clearance.

I’ll look for the Turner 7.5 mm spacer with integrated hub extender. Actually, I have both 5 mm and 7.5 mm Turner spacers I’m not using.

Gotcha. I appreciate the information. I will definitely look into playing around with spacers up front because I would like to get the camber down to -3 up front.

Do you think 3mm would prevent rubbing even with track driving and autocross? I would hate to have a tire failure on track.

[SYT_Shadow]

Originally Posted by attkspec

Gotcha. I appreciate the information. I will definitely look into playing around with spacers up front because I would like to get the camber down to -3 up front.

Do you think 3mm would prevent rubbing even with track driving and autocross? I would hate to have a tire failure on track.

It should, but it's easy enough to check. If a tire only rubs occasionally, it will not fail. Do a session, then remove a wheel and look at the tire

[attkspec]

Originally Posted by SYT_Shadow

It should, but it's easy enough to check. If a tire only rubs occasionally, it will not fail. Do a session, then remove a wheel and look at the tire

Right on.

[M3SQRD]

Originally Posted by attkspec

Gotcha. I appreciate the information. I will definitely look into playing around with spacers up front because I would like to get the camber down to -3 up front.

Do you think 3mm would prevent rubbing even with track driving and autocross? I would hate to have a tire failure on track.

The 3 mm number is for the track. It’s used in the cases where you’re trying to squeeze out that 10 mm of additional tire width without having to implement major changes! Like SYT_Shadow said, check for occasional vs. constant rubbing until you’re comfortable with running 3 mm and/or you’ve changed tire brand/model. You can get away with a small clearance at the top of the tire because all of the deformation is at the bottom of the tire and by the time the tire has rotated 180 deg the tire deformation has dissipated.

[Track/S]

Originally Posted by attkspec

Gotcha. I appreciate the information. I will definitely look into playing around with spacers up front because I would like to get the camber down to -3 up front.

Do you think 3mm would prevent rubbing even with track driving and autocross? I would hate to have a tire failure on track.

Pushing the rim a few mm to the strut will not allow you to remove much camber, with adjustable arms you would not have to touch the spacer and can go with -1° of camber.

[F82ny]

M3SQRD MineralWhiteF80 SYT_Shadow

Maybe you guys can point me in the right direction please. Your responses seem to be about clearance between the FRONT strut tube and tire. But how much minimum clearance is “safe” to have between the REAR tire and REAR strut tube on a f82 M4 with 20” Competition wheels that is moderately lowered. For the sake of this, Assume the car is already on the ground, so suspension is loaded. Is 3mm still a minimum to target?

[M3SQRD]

Originally Posted by F82ny

M3SQRD MineralWhiteF80 SYT_Shadow

Maybe you guys can point me in the right direction please. Your responses seem to be about clearance between the FRONT strut tube and tire. But how much minimum clearance is “safe” to have between the REAR tire and REAR strut tube on a f82 M4 with 20” Competition wheels that is moderately lowered. For the sake of this, Assume the car is already on the ground, so suspension is loaded. Is 3mm still a minimum to target?

The rear inner clearance is very different from the front strut clearance. The rear damper is located further back from the wheel mounting face on the brake rotor. I’m aware of two people that have fit 325s on 12” wide wheels on the rear and quite a few people with 315s on 11”-11.5” wide wheels. 305 on 11et44 is one of the most used aftermarket wheel setups used on the rear. You’d have to be running something really wide with high offsets to run into a problem on the rear. A 295 on a 10.5” wide wheel with offsets between 36 to 46 (M2CSR 18x10.5et46 513M wheel) will all work without any inner clearance issues. Is there something specific you’re looking at for the rear?