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      02-08-2018, 03:12 PM   #67
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Originally Posted by ZM2 View Post
Do you think a 275/35/18 and 295/30/18 Hoosier R7 would fit with no problems on a lowered/cambered car and the 9.5 ET28, 10.5 ET40 FL-5s?
A 275/35-18 R7 will be pushing the limits of the M2 fender clearances. You will need in excess of -3˚ of camber up front to clear that wide of a tire without major rubbing issues.

The 295/30-18 will be a bit too short for the rear of the M2. We would recommend the 295/35-18. This should fit without issue, but a fender roll might be required with an R compound like the Hoosier.

- Max
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      02-08-2018, 04:32 PM   #68
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Quote:
Originally Posted by Expert@ApexRaceParts View Post
A 275/35-18 R7 will be pushing the limits of the M2 fender clearances. You will need in excess of -3˚ of camber up front to clear that wide of a tire without major rubbing issues.

The 295/30-18 will be a bit too short for the rear of the M2. We would recommend the 295/35-18. This should fit without issue, but a fender roll might be required with an R compound like the Hoosier.

- Max
For the 275/35 front on the 18x9.5 ET28 FL-5, even an RE-71R is too wide with -2.7 camber? Tirerack shows the section width of the RE-71R to be slightly wider than the R7 on a 9.5" rim. I've run the 265/35 on ET30, but not the 275 on ET28.

For the rear, the only 285, 295, or 305 35-series track tires I can find are A052's or R888's--not the best tires.

Overall, I'm trying to get the most rubber as possible under the car with a typical track setup for the guys here (lowered 3/4", -2.7 front, -2.0 rear).

I was thinking I could go with a 265/35(F) & 285/30(R) setup for RE-71R, but it sounds the rear would be too short. And, 275/35(F) & 295/30(R) R7 setup, but the front sounds too wide and the rear too short.

What is Apex's wheel and tire fitment recommendation to get the most rubber possible (in a good track tire) on the M2?

Thanks.
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      02-08-2018, 06:13 PM   #69
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Quote:
Originally Posted by ZM2 View Post
For the 275/35 front on the 18x9.5 ET28 FL-5, even an RE-71R is too wide with -2.7 camber? Tirerack shows the section width of the RE-71R to be slightly wider than the R7 on a 9.5" rim. I've run the 265/35 on ET30, but not the 275 on ET28.

For the rear, the only 285, 295, or 305 35-series track tires I can find are A052's or R888's--not the best tires.

Overall, I'm trying to get the most rubber as possible under the car with a typical track setup for the guys here (lowered 3/4", -2.7 front, -2.0 rear).

I was thinking I could go with a 265/35(F) & 285/30(R) setup for RE-71R, but it sounds the rear would be too short. And, 275/35(F) & 295/30(R) R7 setup, but the front sounds too wide and the rear too short.

What is Apex's wheel and tire fitment recommendation to get the most rubber possible (in a good track tire) on the M2?

Thanks.
We would recommend the 18x9.5 ET28 square with a 275/35-18. There are a wide variety of tires available in this size that are suitable for track use. You will need close to -2.7˚ for this fitment up front. You might need additional camber for a RE71R or an R7.

This is the preferred track fitment as it allows for rotation of tires, extending their life and more balanced handling at the limit.

The 18x10.5 ET40 rear can work with the 295/30-18 but it is not ideal. You are losing -1.335 inches in overall diameter in the rear over the stock 19x10 ET40 OEM M2 wheel with the 265/35-19. This is a -5.3% change, which is not ideal.

Tire selections are more ideal in this 295/30-18 but keep in mind that the lower overall diameter can cause issues with your speedometer accuracy and your traction control effectiveness.



- Max
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      02-08-2018, 06:48 PM   #70
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Quote:
Originally Posted by Expert@ApexRaceParts View Post
We would recommend the 18x9.5 ET28 square with a 275/35-18. There are a wide variety of tires available in this size that are suitable for track use. You will need close to -2.7˚ for this fitment up front. You might need additional camber for a RE71R or an R7.

This is the preferred track fitment as it allows for rotation of tires, extending their life and more balanced handling at the limit.

The 18x10.5 ET40 rear can work with the 295/30-18 but it is not ideal. You are losing -1.335 inches in overall diameter in the rear over the stock 19x10 ET40 OEM M2 wheel with the 265/35-19. This is a -5.3% change, which is not ideal.

Tire selections are more ideal in this 295/30-18 but keep in mind that the lower overall diameter can cause issues with your speedometer accuracy and your traction control effectiveness.



- Max
Thanks Max.

I run with DSC off, so TC shouldn’t be an issue.

Do you guys have any direct feedback on the impact to handling or the torque vectoring differential with the 265/35F 285/30R or 275/35F 295/30R setup, vs 275/35 square?

There’s a decent bit more rubber with the 285 or 295/30 rear, but is it at the expense of handling or balance? Anyone out there running this setup?

Thanks.
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      02-08-2018, 07:49 PM   #71
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Does that mean the sm10 is out ?
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      02-10-2018, 08:10 PM   #72
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Quote:
Originally Posted by Expert@ApexRaceParts View Post
We would recommend the 18x9.5 ET28 square with a 275/35-18. There are a wide variety of tires available in this size that are suitable for track use. You will need close to -2.7˚ for this fitment up front. You might need additional camber for a RE71R or an R7.

This is the preferred track fitment as it allows for rotation of tires, extending their life and more balanced handling at the limit.

The 18x10.5 ET40 rear can work with the 295/30-18 but it is not ideal. You are losing -1.335 inches in overall diameter in the rear over the stock 19x10 ET40 OEM M2 wheel with the 265/35-19. This is a -5.3% change, which is not ideal.

Tire selections are more ideal in this 295/30-18 but keep in mind that the lower overall diameter can cause issues with your speedometer accuracy and your traction control effectiveness.



- Max
What do you think of running the 18x10.5 ET40 FL-5 or one of your 18x11 ET44 wheels in the back with a 315/30/18 R888R?

EDIT: I did some measuring this weekend and I think even if I find the wheel width and ET to tuck a 315/30/18 in as far as possible, it’ll stick out too far passed the fender.

Last edited by ZM2; 02-11-2018 at 08:35 PM..
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      04-13-2018, 06:39 PM   #73
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Quote:
Originally Posted by ApexRaceParts View Post
We understand some customers may need wheels immediately, and we currently have a few fitment options available for the M2 depending on the customers plans for the car.

In your case, I would go with our EC-7 18x10" ET33 square fitment. This will properly support 265/35-18 or 275/35-18 tires on all four corners, and will also allow you to rotate wheels and tires effectively. Depending on which coilovers you are running, you will need to install 10mm - 12mm spacers up front for proper strut clearance.

If you would prefer one of the new designs (FL-5 or SM-10), we also have the 18x9.5" ET35 square fitment available. That fitment will need 5mm - 12mm spacers up front as well for proper strut clearance.



Thank you for your feedback and interest. Pricing is listed on the Group Buy website (see signature), and to keep things technical in this thread we will not be posting that information here



Appreciate the feedback

- Ryan
If you're not concerned with rotating wheels, but at least tires, could you do the EC7 in a 18x10 ET25 front and 18x10 ET33 rear and run either 265/35 or 275/35 squared?
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      04-14-2018, 06:40 AM   #74
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Apex,

So there will be no 19" wheels with these offsets built for the M2, even considering how many of these BMWNA has imported so far (and the now follow-on M2 Competition model taking the reign)? Are you still planning on the 18" sizes discussed herein? I'm hunting wheels now for the M2 Competition -- never too early to start looking for track fitments. With the potentially much larger brakes available on the M2 Competition, I'm concerned about 18" wheels fitting at all.

Regards,
Chuck
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      04-16-2018, 12:39 PM   #75
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Quote:
Originally Posted by CSBM5 View Post
Apex,

So there will be no 19" wheels with these offsets built for the M2, even considering how many of these BMWNA has imported so far (and the now follow-on M2 Competition model taking the reign)? Are you still planning on the 18" sizes discussed herein? I'm hunting wheels now for the M2 Competition -- never too early to start looking for track fitments. With the potentially much larger brakes available on the M2 Competition, I'm concerned about 18" wheels fitting at all.

Regards,
Chuck
Thanks for the post! We do have a 19x9" ET28 (available now in the ARC-8 design, SM-10 coming soon) and 19x10" ET33 (SM-10 coming soon) as our recommended fitments for the M2. We may produce the 19x9.5" ET28 and 19x10.5" ET40 if there is significant demand for those sizes, but we do not have a set ETA just yet.
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      04-17-2018, 04:13 AM   #76
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I Would buy The Fl-5 directly. Looks awesome!
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      06-04-2018, 11:12 AM   #77
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Quote:
Originally Posted by ApexRaceParts View Post
Are you thinking of running a square or staggered fitment with the 18x10" ET43?

The EC-7 18x10" ET33 would be the better choice for a square fitment. Perfect fitment in the rear, and spacers up front for proper strut clearance. Spacer thickness up front would depend on suspension type, and tire size/brand, but many have used either 10mm or 12mm.

If you used the 18x10 ET43, the rears would would sit a few mm recessed in comparison to the OEM rear wheels, but more importantly the front would require very thick spacers for strut clearance - 20mm or so.

Here is a photo of an AlekShop built M2 with our 18" EC-7's:

APEX EC-7 18x10" ET33
275/35-18 Bridgestone RE-71R Tires
Ohlins Coilovers
12mm spacers up front (for strut clearance)
AP Racing BBK







Now if you are strictly asking about rear inner clearance because you are only using them in the rear, either the 18x10" ET33 or ET43 would work just fine. Keep in mind the proposed FL-5 rear wheel in the OP is 18x10.5" ET40, which sits 3mm closer to the rear suspension than the 18x10" ET43.



We're initially running with the FL-5 design due to popular demand, and depending on how these sizes sell we'll know if a second design is warranted or not. To be determined.

- Ryan
Did Alekshop's M2 have rear AP Racing BBK as well? I'm planning on upgrading to APR BBK all around and would like to run a staggered setup. What would be the ideal wheel setup to run 275-305? Also how much minimum camber would I need in the front?
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