Hey guys.
I have a conversation going with Apex (
http://f87.bimmerpost.com/forums/sho...5#post22760045), but I wanted to open it up to everyone.
Most of us are a little lowered and are running negative camber. This limits us to about 275/35/18 in the front, but I should be able to get a 285/30 or 295/30 to fit in the back with their new FL-5 10.5” wheel. Have any of you guys ran these combos on this or other cars?
I’m trying to figure out if the gain in rear rubber is offset by negative impacts to handling or the way the differential works. This isn’t a square/stagger question, but a wider/lower diameter rear vs front question.
The reason I’m looking at these sizes is bc these are the RE-71R and R7 sizes in this range.
Thanks.
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Quick update:
I ran 265/35/19 & 295/30/19 Hoosier R7s on the car at an open track day last week. I believe this is the Max Rubber you can get on a track prepped M2 with camber and lowered suspension!
I originally tried 295/35/19 R7s in the rear, but they were too tall and had to go 295/30s. They don't make 265/30 R7s, but the balance was still good front to rear and there was tons of grip and it was a blast!
The 265/30/19 & 295/30/19 Trofeo R setup I tried on track were great, as well. For cheaper tires, I think I can fit a 305/30/19 RE-71R in the back, but I probably won't try that until next year.
You can find my suspension and wheel specs in the thread if you're trying to figure this out, as well.
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Latest update:
On my 19” track setup that I used for the last two years I ran Trofeo’s, Cup 2, R888R, RE-71R, and R7s, and was able to run 265/30-35 in the front and 295-305/30 in the rear.
I am going back to 18s so I can run NT01, AR1, A052, Toyo RR, and Pirelli slicks.
Crazy thing is going to the forged EC-7 18’s with A052’s will save 30lbs of rotational unsprung weight, vs my 19” VMR’s (1/2lb heavier per wheel than 19” EC-7) and RE-71Rs.
The wheel/tires I’m comparing for my setup are VMR 710FF 19x9.5 ET33 (with 3mm spacer) and 19x10.5 ET45 with 265/35/19 and 305/30/19 RE-71R’s, vs Apex Forged EC-7 18x10 ET25 and 18x10.5 ET40 with 265/35/18 and 295/35/18 A052’s.
Four width size differences was too much for good balance, but 2-3 width difference has been good in my other staggered setups, so looking forward to 265/295 and 275/295-305 with the 18’s.
I just need to make sure a 305/35/18 will clear with ET40 and lowered 3/4” in the rear. It’ll be a while before I test it bc of all the track events being shut down, but I’ll post an update when I do.
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Latest, latest update:
After running countless combo’s I’ve settled on 275/35/18 & 295/35/18. No spacers or fender work needed with the right wheel offsets (I’m on 18x10ET25 and 18x10.5ET40 Apex VS-5RS).
I much prefer the feel of 20mm F/R stagger for in-corner four wheel drift, and F/R wear is very similar if you’re driving the car in a balanced manner.
Currently running RE-71RS’s and looking forward to trying the Nankang CR-S v2 2023 updated tire when my preferred sizes are available later this year.