[GJMills]

Originally Posted by ZM2

18x10 ET25 275/35
18x10.5 ET40 295/35 RE-71RS is my setup

How do you like this tire setup? How did it compare to previous combos?

[ZM2]

Originally Posted by GJMills

How do you like this tire setup? How did it compare to previous combos?

My fav so far. Only other thing I might try is the CR-S v2 in the same sizes.

[GJMills]

Originally Posted by ZM2

My fav so far. Only other thing I might try is the CR-S v2 in the same sizes.

What other combos have you tried?

[ZM2]

Originally Posted by GJMills

What other combos have you tried?

See first post in this thread.

[GJMills]

Originally Posted by ZM2

See first post in this thread.

Thanks!

[OG Shark]

CRS V2's - ugh cannot find any in the proper sizes right now and less than 2 weeks out from Super Lap Battle!!

[jwr9152]

Originally Posted by OG Shark

CRS V2's - ugh cannot find any in the proper sizes right now and less than 2 weeks out from Super Lap Battle!!

Yeah, I've had a set ordered for almost a month. Supposed to be in within the next week or two.

[OG Shark]

Originally Posted by jwr9152

Yeah, I've had a set ordered for almost a month. Supposed to be in within the next week or two.

They have been stuck at port for almost a month now and still haven't cleared customs. Think I going to miss the window to get these here and properly ready for 3/9&10. 200TW limit in the class I'm running the M2 in.

[jwr9152]

Originally Posted by OG Shark

They have been stuck at port for almost a month now and still haven't cleared customs. Think I going to miss the window to get these here and properly ready for 3/9&10. 200TW limit in the class I'm running the M2 in.

I'm in the same boat. Hope they come through, but we will see.

[AmuroRay]

If nothing else - the massive tire advantage the M2 has over the M235i just makes this a unwinnable battle.

I can’t imagine a car that would swallow 275s - though my E92 was close.

[ZM2]

Originally Posted by AmuroRay

If nothing else - the massive tire advantage the M2 has over the M235i just makes this a unwinnable battle.

I can’t imagine a car that would swallow 275s - though my E92 was close.

I was very excited about the M235i when it first came out bc it was the perfect sized car coming from three MINI JCW's, but I was disappointed the first time I drove it at an M track day and realized my JCW had more grip and less understeer.

So, I waited and did a private test of the M2 back in 2016 when the Performance Center had a few and before they were on sale in the US. One track test drive with a PC instructor (and later race car teammate) and I immediately got on my dealer's M2 allocation list.

Haven't looked back!

[GenXG87]

Just finished a weekend at Road Atlanta and AMP.

Running
APEX wheels and RE-71RS
18x10 ET25 275/35
18x11 ET44 295/35
no spacers 100% stock suspension. -1.4 deg Front -1.6 deg Rear

Every so slight fender rub on the front left. No liner rub.

Very happy with the RE-71RS vs the Falken RT-660s I run on my G87.

Once the front has 3deg ish of camber it will be a perfect fit.

[GasBurnlife(landapanda)]

Is anyone running a 10.5” square setup? I am currently on BW 10” 33ET wheels running 275/35 Toyo RRs (12mm spacer up front) and would like to go to a 10.5” setup for my next wheelset in order to be able to run a 285 or 295 tire.

I know the rear clearance won’t be an isssue as others including ZM2 already run 10.5” wheels ET36 I believe with no spacers out back. Based on my research a 10.5” should fit upfront with more than 3.5 degrees of negative camber (I run 3.7 up front and 2.7 out back).

The M2CS Race car runs a 10.5” ET 46 with a 41mm spacer up front and 16mm spacers out back. I’d like to avoid running such a large spacer if possible. Also - I am on BW’s GRMore suspension setup running MCS remote reservoirs and hyper oil springs.

[M1500Z]

Originally Posted by GasBurnlife(landapanda)

Is anyone running a 10.5” square setup? I am currently on BW 10” 33ET wheels running 275/35 Toyo RRs (12mm spacer up front) and would like to go to a 10.5” setup for my next wheelset in order to be able to run a 285 or 295 tire.

I know the rear clearance won’t be an isssue as others including ZM2 already run 10.5” wheels ET36 I believe with no spacers out back. Based on my research a 10.5” should fit upfront with more than 3.5 degrees of negative camber (I run 3.7 up front and 2.7 out back).

The M2CS Race car runs a 10.5” ET 46 with a 41mm spacer up front and 16mm spacers out back. I’d like to avoid running such a large spacer if possible. Also - I am on BW’s GRMore suspension setup running MCS remote reservoirs and hyper oil springs.

Can't really compare the M2 CS R directly to the standard M2 because of the offset damper top mount and shorter lower arm—pulling the knuckle inward to allow for the fender clearance. Interesting tidbit—BMW shipped that car with -3º camber (Nurburgring) and recommend an alternate -3.4º for GP circuits.

But to answer your question, I have a spare set of 18x10.5 +37s and a set of 25mm spacers that I want to test fit with a 275/35-18 up front and see if I can maintain my -3.2º of camber. Previously I tried this with an 18mm spacer and the wheel lip touched the damper body. I hope to try the 25mm spacers in the coming weeks and I estimate that I can probably clear the strut at the wheel with ~20mm spacer. There are also people on here who have fit the CS R wheels with a 295 setup on thinner bodied dampers (Stock, KW, maybe others?). It shouldn't be hard for you with that much camber.

For the tire though—what I've long been curious about is whether an optimized setup with a 275/35-18 is as quick or quicker than a compromised setup with a 295/30-18. Maybe I'm just stubborn or conservative, but is a 295/30-18 going to be much better if on a non-ideal wheel width with a potentially a potentially compromised alignment for it to fit, when compared to a 275/35 on a 10.5" wheel with a dialed alignment? Are there 285/35 options that are good? I feel pretty strongly that the 35 sidewall is better than the 30 and it should be on an 11" wheel if possible—I've only seen one soul brave enough to attempt this so far and it appears to have required quite a bit of work. Last I saw, he was still working through it.

You're running what, to me, seems like a lot of camber but I honestly can't say whether my setup of -3.2º fr / -2.3º rr is better or worse.

Update
I had the car in the air already for some other work and figured now is as good a time as any to slap rear wheel on the front with a 25mm spacer. So important numbers:

• 18x10.5 +37 with a 25mm spacer, this means an effective offset of +12
• 275/35-18 RE-71RS
• -3.2º front camber

I measured a clearance of approximately 7mm using a plastic trim tool as a gauge and measuring it with a caliper. For my setup, I could reduce the spacer by a few mm, but I think a 20mm spacer would leave me with a scant 2mm which is pretty damn close. More camber would be necessary too.

[medphysdave]

I run a square 10.5" CSR setup on stock suspension. 25mm front spacer, no rear spacer, camber plates and adjustable lower control arms. Custom caliper brackets and 380mm rotors. 295/30/18

[AmuroRay]

Ok since an M2 isn't an option, on my M235i 9.5" and a 265 or just stay with 9" and a 255 - does that extra 10mm make a difference?

[CSBM5]

Originally Posted by M1500Z

For the tire though—what I've long been curious about is whether an optimized setup with a 275/35-18 is as quick or quicker than a compromised setup with a 295/30-18. Maybe I'm just stubborn or conservative, but is a 295/30-18 going to be much better if on a non-ideal wheel width with a potentially a potentially compromised alignment for it to fit, when compared to a 275/35 on a 10.5" wheel with a dialed alignment? Are there 285/35 options that are good? I feel pretty strongly that the 35 sidewall is better than the 30 and it should be on an 11" wheel if possible—I've only seen one soul brave enough to attempt this so far and it appears to have required quite a bit of work. Last I saw, he was still working through it.

I would opt for the 275 on 10.5 too - love how that feels on my M3 I just sold. I have always felt that having near max wheel width for a given section width is more important than fitting the widest tire that is somewhat flopping around with a narrower than near max wheel width. The Tire Rack testing of wheel/tire widths pretty much aligned with those long held beliefs. This link is probably elsewhere in this thread, but if not and for those who've not seen it: https://www.tirerack.com/tires/tests...y.jsp?ttid=296 Notice how well the 225 did on a 9" wheel compared to a 245 on an 8" in the dry test data for example. Too bad they didn't pull out a 10" wheel for the 245 since it probably would have topped the test.

AmuroRay, to answer your question, yes, you're probably better off with the 255 on the 9" wheel versus the 265, but it's likely a very small difference either way.

[ThreeStripes]

Originally Posted by CSBM5

I have always felt that having near max wheel width for a given section width is more important than fitting the widest tire that is somewhat flopping around with a narrower than near max wheel width. The Tire Rack testing of wheel/tire widths pretty much aligned with those long held beliefs. This link is probably elsewhere in this thread, but if not and for those who've not seen it: https://www.tirerack.com/tires/tests...y.jsp?ttid=296

Agree and always get a kick out of guys I see in the paddock putting 285 or 295 rears on the stock 10” rears.

[E90convert]

One of my racing pals with an F82 put 295/35 on his 18x10 square setup he uses for time trial work. His feedback was never again: the chassis felt sluggish and lost all steering response. We need a wider wheel. I had a similar experience when I went from 255/40 to 275/40 on an 17x9 square setup on a E90 335i. My rule of thumb for a track track usage is to keep the wheel width at the tire's specified "measured rim width", or wider. For example:

A 275/35-18 is approved for 9-11" wheels. The measured rim width is 9.5", so I wouldn't go below 9.5".
A 295/35-18 is approved for 10-11.5" wheels, and the measured rim width is 10.5".

As stated above, the TireRack study demonstrates that wider is better.

I personally went with a VS-5RS 18x10 and plan to run a 275/35 V730.

[medphysdave]

Interesting. I run 295/30/18 on a 10.5 wheel. Would be interesting to see how it feels compared to 285 tire. It may also matter what tire and how stiff the sidewalk is. I'd imagine a stiffer sidewall might get away with narrower rim.

[AmuroRay]

Originally Posted by CSBM5

I would opt for the 275 on 10.5 too - love how that feels on my M3 I just sold. I have always felt that having near max wheel width for a given section width is more important than fitting the widest tire that is somewhat flopping around with a narrower than near max wheel width. The Tire Rack testing of wheel/tire widths pretty much aligned with those long held beliefs. This link is probably elsewhere in this thread, but if not and for those who've not seen it: https://www.tirerack.com/tires/tests...y.jsp?ttid=296 Notice how well the 225 did on a 9" wheel compared to a 245 on an 8" in the dry test data for example. Too bad they didn't pull out a 10" wheel for the 245 since it probably would have topped the test.

AmuroRay, to answer your question, yes, you're probably better off with the 255 on the 9" wheel versus the 265, but it's likely a very small difference either way.

I've seen this test a while ago, but wanted to get actual road feel perspectives. Thank you!

[AmuroRay]

Originally Posted by ZM2

18x10 ET25 275/35
18x10.5 ET40 295/35 RE-71RS is my setup

Running Bilstein PSS10, which is pretty close to stock suspension spring width.

Are you running the stock spring rates, and do you know what they are?