[ZM2]

I’m pretty sure they’re flow formed: http://velocitymotoring.com/wheels/v710ff/

I’ve run them on some pretty bumpy tracks and over curbs all the time. No issues.

[CosmosMpower]

Originally Posted by ZM2

The 255/285/35/19 RE-71R combo is the fastest track tire setup you’ll find for the M2, except for slicks.

I run 9.5/10.5 width track wheels, so I run 265/35 in the front and will try the 305/30 in the rear. They are close enough in diameter that you don’t need to worry about a 30 in the rear and a 35 in the front, when on track with DSC off. It’ll be more about handling balance, which I won’t know until next year.

As far as running them on the street, not sure if the DSC will get upset. I think it’s within range that the computer will adapt.

275 or 285 square is the way to go. On a 18x10 square ET33 (with a spacer)

[ZM2]

Originally Posted by CosmosMpower

275 or 285 square is the way to go. On a 18x10 square ET33 (with a spacer)

That setup sticks out too far for my preference, and I also like the balance of the car more with the staggered setup vs square.

Plus, I don’t think it fits over the 2NH brakes for the M2C guys, but I could be wrong.

[CosmosMpower]

Originally Posted by ZM2

That setup sticks out too far for my preference, and I also like the balance of the car more with the staggered setup vs square.

Plus, I don’t think it fits over the 2NH brakes for the M2C guys, but I could be wrong.

It shouldn't stick out past the fenders at all with that offset. BMW's have too much built in understeer, especially without camber plates. It needs all the front tire it can get to turn in and then rotate on the way out of corners. 2NH brakes won't allow you to use 18's.

Here's a 275 front on an 18x10 with ET25.

[ZM2]

I hear ya. Altho, I’d rather run a 265 9.5” ET33 front (no spacer needed) & 285-305 10.5” ET45 rear to keep the tires more tucked in and from throwing so much stuff up on the side of the car. Below are some pics.

My 265/295/30/19 track set is quicker than my 265/35/18 square set bc I can get a lot more power down coming out of the corner. I’m sure 275 square is a little better than 265 square, but I’ve also found that the staggered setup is more stable at the limit under hard braking and on throttle.

Previous BMW’s I’ve driven definitely have more understeer built in, but the M2 doesn’t feel that way, especially with -3.1 camber.

And, I think the 18” square option is out for Proctor bc I think he has 2NH brakes. Not sure.

[Proctor750]

Originally Posted by ZM2

Previous BMW’s I’ve driven definitely have more understeer built in, but the M2 doesn’t feel that way, especially with -3.1 camber.

And, I think the 18” square option is out for Proctor bc I think he has 2NH brakes. Not sure.

Indeed I have the 2NH (standard in the USA for M2C) so stuck with 19's unless I swap brakes.

I think you nailed it on the 19 staggered setup. I'm going to give it a try.

What camber plates do you use btw?

Eventually I'd like to go with a nice MCS 2 way setup down the road but need camber plates in the meantime. Leaning towards GC.

[ZM2]

I’m on Vorshlag, which is what RRT (that you may know from AER) recommended. They said their spherical bearing setup lasts longer over time than GC and some other brands. I can’t verify that, but no issues or noise after almost 2-yrs.

And, the one thing I’m unsure of is if ET45 in the rear is enough for a 305/30/19 RE-71R to clear the fender on a lowered car. The 295/30 Trofeo R and Hoosier R7’s clear, so I have to think the 305 71R will be fine.

[CosmosMpower]

Originally Posted by ZM2

I’m on Vorshlag, which is what RRT (that you may know from AER) recommended. They said their spherical bearing setup lasts longer over time than GC and some other brands. I can’t verify that, but no issues or noise after almost 2-yrs.

And, the one thing I’m unsure of is if ET45 in the rear is enough for a 305/30/19 RE-71R to clear the fender on a lowered car. The 295/30 Trofeo R and Hoosier R7’s clear, so I have to think the 305 71R will be fine.

They don't make a camber plate for M3/M4 and M2C uses the same setup as M3/M4.

[jagged]

Originally Posted by ZM2

Either is a good setup. 285 will give you a tiny bit more dry traction. 275 will give you a tiny bit more wet traction (since you mentioned you’re in a tropical climate).

Good to know, 255/285/35 combination is also an option especially since I plan to keep suspension stock! Anyone else with this setup? I read in another thread that 255/275 is more balanced and 255/285 can cause a bit more understeer?

I'm unsure if I will track the M2 although it's activity I hope to get into eventually. For aggressive street driving on weekends (e.g. canyon roads), do you think better I use 285 for the rear? It does rain quite a bit where I'm from.

I've noticed that with the stock 265, they tires can lose traction easily during sudden acceleration. But I haven't really tested the limits as car is still in break-in process (revs below 5k).

[ZM2]

Originally Posted by jagged

Good to know, 255/285/35 combination is also an option especially since I plan to keep suspension stock! Anyone else with this setup? I read in another thread that 255/275 is more balanced and 255/285 can cause a bit more understeer?

I'm unsure if I will track the M2 although it's activity I hope to get into eventually. For aggressive street driving on weekends (e.g. canyon roads), do you think better I use 285 for the rear? It does rain quite a bit where I'm from.

I've noticed that with the stock 265, they tires can lose traction easily during sudden acceleration. But I haven't really tested the limits as car is still in break-in process (revs below 5k).

I’d do 255/275 if I had a stock M2. 255/285 with a modded M2 or M2C. Rear traction is the limitation in our cars, so more rubber out back helps.

[Old Geezer]

Originally Posted by jagged

I read in another thread that 255/275 is more balanced and 255/285 can cause a bit more understeer?

I just put 255/275 RE-71Rs on my M2C. I’ll let you know how they work out.

[Old Geezer]

Ran my first autocross on the 255/275 RE-71Rs last weekend. Surface was fairly grippy concrete. Slight understeer in some situations, but easy to manage. 275s in back allow throttle-induced rotation, but its easier to control than with the Michelins. Overall, I’m happy with the front/rear balance.

[F87source]

Man I didn't think it was a good idea to stuff wider tires onto the factory wheel because it's a generally recommended you need an 11" wheel for 305 section tires. Otherwise it's probably not the safest thing when you take hard corners because the side wall may be compromised from being packed into a smaller rim, and could fold.

If the overall tire height is within 1% of factory dsc should be fine, it's not the aspect ratio that has to be matching the stock 35, what matters is you pick an aspect ratio that yields the same or within 1% overall height of the tire + rim assembly, as aspect ratio is based on wheel width.

Overall good to see what everyone here is running, maybe you guys that want 18" wheels can look at hankook rs4's I've heard they're better than re71r.

Also imo try to minimize the stagger front to rear as the larger the gap between the front tire width and rear the more understeer you'll add, because the front tires will loose grips before the rear. So it's a common misconception that everyone tries to stuff the largest tires in the back as possible and ignores the front, unless of course you're a drag racer in which by all means prioritize the rear.

[ZM2]

RS4’s last longer, but RE-71Rs are grippier.

The problem with a square setup on the M2 is you’re limited to whatever size you can fit on the front. Even a lightly tuned M2 or M2C can easily overpower that width.

285 on the stock rear rims is fine. IMO, 295/305 should be on a 10.5” for our cars.

I’ve run square and staggered on track and staggered is faster. As for preferred size & handling balance for the street, that’s each person’s preference.

[F87source]

Originally Posted by ZM2

RS4’s last longer, but RE-71Rs are grippier.

The problem with a square setup on the M2 is you’re limited to whatever size you can fit on the front. Even a lightly tuned M2 or M2C can easily overpower that width.

285 on the stock rear rims is fine. IMO, 295/305 should be on a 10.5” for our cars.

I’ve run square and staggered on track and staggered is faster. As for preferred size & handling balance for the street, that’s each person’s preference.

When I ran rs4's in my frs I found it gripped alot better than re71r's.

Yeah for sure, I prefer a staggered setup too, but just don't make it so staggered that there a huge difference in size. Like 255 front and 305 rear is way too much if a gap, and you'll definitely be limited on turn in's with what the front will be able to handle vs. Rear.

From all the recommended tire size charts you need a minimum 11" rim for a 305 tire. Personally I wouldn't try to force anything especially under extreme driving conditions such as on the track.

[ZM2]

I don’t think a 305 on an 11” wheel will fit in the back of a lowered M2. There’s probably some perfect offset to make it work tho. 11” is def more ideal for a 305, but I’m going to try it on a 10.5” just to see how grip, handling, and times are impacted. The sidewalls on the 305/30 RE-71R should be stiff enough to not worry about rollover or pinching.

https://www.tirerack.com/tires/tests...y.jsp?ttid=234

https://rennlist.com/forums/racing-a...ison-nyst.html

http://racetrackdriving.com/tech/tir...estone-re-71r/

[F87source]

Originally Posted by ZM2

I don’t think a 305 on an 11” wheel will fit in the back of a lowered M2. There’s probably some perfect offset to make it work tho. 11” is def more ideal for a 305, but I’m going to try it on a 10.5” just to see how grip, handling, and times are impacted. The sidewalls on the 305/30 RE-71R should be stiff enough to not worry about rollover or pinching.

https://www.tirerack.com/tires/tests...y.jsp?ttid=234

https://rennlist.com/forums/racing-a...ison-nyst.html

http://racetrackdriving.com/tech/tir...estone-re-71r/

Yeah it probably wouldn't fit on an 11" idk. Why size rim are you running it on?

Personally I think 285 rear should be sufficient, just tune the m2 with a power band near the top end with a larger turbo, it'll help with putting the power down, and be better for corner exits too. If you have a car that's too bottom end heavy it'll always break loose on corners regardless. Look at the m4 gts it's really good at putting that power down and has 285's in the rear.

[ZM2]

Originally Posted by F87source

Yeah it probably wouldn't fit on an 11" idk. Why size rim are you running it on?

Personally I think 285 rear should be sufficient, just tune the m2 with a power band near the top end with a larger turbo, it'll help with putting the power down, and be better for corner exits too. If you have a car that's too bottom end heavy it'll always break loose on corners regardless. Look at the m4 gts it's really good at putting that power down and has 285's in the rear.

19x10.5 ET45.

255/285 RE-71R on stock rims is definitely the best bang for the tire grip buck on the M2.

I’m purely talking track to try the 305. I’ve already ran a 295/30 R7 and it was pretty killer. On track my revs are always above 5k no matter the speed or corner.

[F87source]

Originally Posted by ZM2

19x10.5 ET45.

255/285 RE-71R on stock rims is definitely the best bang for the tire grip buck on the M2.

I’m purely talking track to try the 305. I’ve already ran a 295/30 R7 and it was pretty killer. On track my revs are always above 5k no matter the speed or corner.

I'm looking at 275/285 likely rs4's, it really does seem the hankook edges out the re71r's. Or I maybe go r888r.

255/305 you'll definitely see more understeer vs. stock if you take the corner fast enough, because the rears will take alot more to break out vs. the front.

I see a whole host of rpms, as there are some corners on the tracks I attend that dips below 3k rpm so I have to manage how power is delivered.

[ZM2]

I think we read the 71R and RS4 reviews differently. Plus, I can say from experience the 71R is faster, but the RS4 lasts longer. Also, the R888R is less grippy than the 71R and burns up just as quickly.

If I were going for only one size difference bn front & rear (275/285), I’d just run square.

I’ll fit 265/305 on my next outing. The under/oversteer balance is what will dictate if I stay with it or not. Lots of opinions here, but only one way to find out.

You should only see 3k on the track if you’re in a 20mph corner.

[F87source]

Originally Posted by ZM2

I think we read the 71R and RS4 reviews differently. Plus, I can say from experience the 71R is faster, but the RS4 lasts longer. Also, the R888R is less grippy than the 71R and burns up just as quickly.

If I were going for only one size difference bn front & rear (275/285), I’d just run square.

I’ll fit 265/305 on my next outing. The under/oversteer balance is what will dictate if I stay with it or not. Lots of opinions here, but only one way to find out.

You should only see 3k on the track if you’re in a 20mph corner.

Maybe lol.

Its either 265/285, or 275/285, I do want to get as much tire in the back as possible but I don't want the stagger to be so significant that it induces alot of understeer.

That's doing autocross lol, some turns are super tight, when I'm doing time attack or open lapping then yeah 5k+ almost all times. I should have referred to it as an autox course not as another track.

[ZM2]

Hahah, cool man. Makes sense.