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      04-16-2019, 06:36 PM   #1
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255/40/17 RE 71 wheel fitment question

It looks like my wheel choices are:

17 X 8.5 et 40
17 X 9.0 et 30

Which of these will fit a stock suspension m235I RWD MT?

Both? Neither?

Is one a "better" fit for autoX and HPDEs.

Thanks
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      04-16-2019, 11:06 PM   #2
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I don't think you're going to fit a 255mm anything in the front on stock suspension. You'll need camber plates to get to at least 2.2-ish degrees to get them to tuck in enough to run such a wide tire. A 235mm may work on stock suspension. And a 245mm may be a better match for a 8.5" rim than a 255mm - that little bit of extra width may not be worth it with your sidewall flexing and squirming.

Of the two wheel options you listed, the 17x8.5et40 would be better, maybe with a small 2-5mm spacer in front, but again...might need some camber depending on tire size.

And keep in mind this is all me bench-racing. I'm on stock wheels for now. But the 17x8.5et40 is one of the options I'm looking at depending on what Apex offers in the forged wheel they've been teasing.

Last edited by 230iZTR; 04-16-2019 at 11:22 PM..
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      04-17-2019, 06:34 PM   #3
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From what I understand you can't fit a 255 width tire underneath the stock suspension, and it'll require some camber as the post above stated to squeeze in under the fender. I also agree that the 8.5 in wheel width is probably your best bet if you don't want to run into fitment issues.

You can fit a 245 tire though on stock suspension though (I have mine on a 17x8 wheel). No rubbing.
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      04-20-2019, 12:15 PM   #4
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If 17x9 et42 ARC-08 will fit a 1er with a 5MM spacer, you should be okay. But as mentioned, camber adjustment is key. If none, I'd strongly suggest the 8.5" on a 235/40, it'll actually perform better. A 255 section should be on a minimum 9" wheel, imo
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      04-30-2019, 02:57 PM   #5
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Couple of guys in this forum who regularly tracks their cars have 255 on their 8.5".
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      03-21-2020, 02:32 AM   #6
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In case anyone was still wondering, I ended up fitting 17x9et42 wheels with 255/40R17 RE71R's. It took a lot of little adjustment to make it work - spacer, fender roll, stud conversion, etc. Here are the specs.
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      03-21-2020, 10:45 AM   #7
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Quote:
Originally Posted by Dylan86 View Post
If 17x9 et42 ARC-08 will fit a 1er with a 5MM spacer, you should be okay. But as mentioned, camber adjustment is key. If none, I'd strongly suggest the 8.5" on a 235/40, it'll actually perform better. A 255 section should be on a minimum 9" wheel, imo

This, 100%, or even better (lighter) is 8" w/225, if the tires come in that width. Lighter, better response, same amount of traction. If you are really serious about a dedicated autocrosser, you also want to consider backfitting the smaller 228 brakes (non-blue) to lose even more weight.
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      03-21-2020, 11:35 AM   #8
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Quote:
Originally Posted by 230iZTR View Post
In case anyone was still wondering, I ended up fitting 17x9et42 wheels with 255/40R17 RE71R's. It took a lot of little adjustment to make it work - spacer, fender roll, stud conversion, etc. Here are the specs.
Thanks for this post. Ive been wanting to do exactly this setup with 17s specifically for HPDE, autox, etc. will run 18s when not. How are the camber plates with the stock EDC on the street?
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      03-21-2020, 07:43 PM   #9
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Quote:
Originally Posted by ifobd View Post
How are the camber plates with the stock EDC on the street?
They do add to the car's NVH (a slight rattle on crappy or uneven pavement; big clanks on speedbumps or potholes) and you can hear the electronic dampers clicking when you work them. But if you turn on the radio at half volume (and I'm one of those people that its always on) its lost in the sound anyway.

I did springs, bumpstops, shockware, and camber plates at the same time with the suspension pulled apart, so its hard to isolate which thing was the highest impact, but I'm very happy with the car's road manners on the Super Sports. It doesn't track onto pavement grooves like people warned it would, and my tire wear has been more even. And the best news is that it provides so much grip now on the RE71R's that this year for track/AutoX is going to be about re-learning its limits.

IMO, its well worth it to go wide and camberd if you're tracking or autocrossing the car and it fits within your rules set. If you're just street driving though...probably overkill and LCA's with square 235's or 245's would be more than enough.
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      03-21-2020, 08:17 PM   #10
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Quote:
Originally Posted by 230iZTR View Post
IMO, its well worth it to go wide and camberd if you're tracking or autocrossing the car and it fits within your rules set. If you're just street driving though...probably overkill and LCA's with square 235's or 245's would be more than enough.
Well said - I believe this is excellent advice.
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      03-22-2020, 11:24 AM   #11
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Quote:
Originally Posted by 230iZTR View Post
Quote:
Originally Posted by ifobd View Post
How are the camber plates with the stock EDC on the street?
They do add to the car's NVH (a slight rattle on crappy or uneven pavement; big clanks on speedbumps or potholes) and you can hear the electronic dampers clicking when you work them. But if you turn on the radio at half volume (and I'm one of those people that its always on) its lost in the sound anyway.

I did springs, bumpstops, shockware, and camber plates at the same time with the suspension pulled apart, so its hard to isolate which thing was the highest impact, but I'm very happy with the car's road manners on the Super Sports. It doesn't track onto pavement grooves like people warned it would, and my tire wear has been more even. And the best news is that it provides so much grip now on the RE71R's that this year for track/AutoX is going to be about re-learning its limits.

IMO, its well worth it to go wide and camberd if you're tracking or autocrossing the car and it fits within your rules set. If you're just street driving though...probably overkill and LCA's with square 235's or 245's would be more than enough.
Quote:
IMO, its well worth it to go wide and camberd if you're tracking or autocrossing the car and it fits within your rules set. If you're just street driving though...probably overkill and LCA's with square 235's or 245's would be more than enough.
Im xdrive and havent been able to find LCAs that work. Currently on 245 squared and dinan springs. Camber adjustable bushings could work but i read about some issues and failures. I do autox and hpde. Looking to go 17x9 square for this if I can get a working setup.
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      03-22-2020, 11:47 PM   #12
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Quote:
Originally Posted by ifobd View Post
Im xdrive and havent been able to find LCAs that work. Currently on 245 squared and dinan springs. [...] I do autox and hpde. Looking to go 17x9 square for this if I can get a working setup.
I'm not personally all that familiar with the differences between the x-drive AWD and s-drive RWD suspensions. But if you're tracking the car regularly, camber plates are right up your alley. Go for it. I went with Vorshlag because their spherical bearings are really heavy duty, and I thought it would work out the best for a dual use street/track build on the stock dampers.
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      03-24-2020, 10:47 AM   #13
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Quote:
Originally Posted by 230iZTR View Post
I'm not personally all that familiar with the differences between the x-drive AWD and s-drive RWD suspensions. But if you're tracking the car regularly, camber plates are right up your alley. Go for it. I went with Vorshlag because their spherical bearings are really heavy duty, and I thought it would work out the best for a dual use street/track build on the stock dampers.
^^ this, and you can still replace the LCA/TS bushings with solid or dense urethane, far better than stock, they have more slop than you realize. This is all done by BMW to make these cars feel more "luxurious", as wehre the M cars have steel bushings creating that NHV and "feel" that most of us are after from a performance car.

D
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      04-02-2020, 05:45 PM   #14
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Quote:
Originally Posted by Dylan86 View Post
Quote:
Originally Posted by 230iZTR View Post
I'm not personally all that familiar with the differences between the x-drive AWD and s-drive RWD suspensions. But if you're tracking the car regularly, camber plates are right up your alley. Go for it. I went with Vorshlag because their spherical bearings are really heavy duty, and I thought it would work out the best for a dual use street/track build on the stock dampers.
^^ this, and you can still replace the LCA/TS bushings with solid or dense urethane, far better than stock, they have more slop than you realize. This is all done by BMW to make these cars feel more "luxurious", as wehre the M cars have steel bushings creating that NHV and "feel" that most of us are after from a performance car.

D
Been looking at Kmac for their camber adjustable bushings, provide for up to 2deg of camber and supposedly a lot better feel downside could be extra stress on the struts. Going back and forth between those or camber plates, dont know if the NVH will bug me or not...
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      04-02-2020, 06:48 PM   #15
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Quote:
Originally Posted by ifobd View Post
Going back and forth between those [Kmac] or camber plates, dont know if the NVH will bug me or not...
If you want to go as wide as possible on the tire, the adjustable bushings should reposition the tire relative to the strut in such a way that it actually reduces inner clearance compared to a camber plate that moves the entire strut assembly. It might not be that big of a deal, but in a game of millimeters, its best to be aware of how every suspension link impacts clearance.

I went straight to plates because a 255 setup was my goal from the start and I saw no reason to be incremental about it. I'm young and its still way quieter than my last rattle-trap of a car. But its probably cheapest and easiest on NVH to start with the bushings for now, and add plates later if the need to add more tire eventually overcomes your fear of a little extra NVH. You can always adjust the bushings back to the stock length if you need more clearance for the plates to do their thing.

Personally, I feel like rolling the fenders to accommodate the 255's was moreso the 'point of no return' compared to introducing a bit more NVH in the form of occasional rattling or speed-bump clunks with the camber plates. You can always remove the camber plates if you don't like them...but unrolling a fender is not possible.
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      04-02-2020, 06:52 PM   #16
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One of my co-workers here at APEX runs our 17x8.5 ET40s on their 228 with 245/40-17 RE71Rs all the way around.

This wouldn't be my recommended wheel for 255s, but with the 245s it works really well!



He is still on stock suspension.

-Tom
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      04-03-2020, 02:38 PM   #17
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Quote:
Originally Posted by ifobd View Post
Been looking at Kmac for their camber adjustable bushings, provide for up to 2deg of camber and supposedly a lot better feel downside could be extra stress on the struts. Going back and forth between those or camber plates, dont know if the NVH will bug me or not...
Tough to comment on NVH as I have the F8x LCA/TS already combined with Clubsports and camber plates lol.. If it were me I'd want the plates to not be limited at -2* especially if you're trying to fit a wider tire like a 255. If you're okay with settling on a 235 you'd be fine with just the bushings, imo

D
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      04-05-2020, 10:27 PM   #18
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Quote:
Originally Posted by Expert@ApexRaceParts View Post
One of my co-workers here at APEX runs our 17x8.5 ET40s on their 228 with 245/40-17 RE71Rs all the way around.

This wouldn't be my recommended wheel for 255s, but with the 245s it works really well!



He is still on stock suspension.

-Tom
Any more photos of his car on this setup?
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      04-06-2020, 01:12 PM   #19
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So I ordered some Apex EC-7's in 18 x 8.5 et35 during the group buy. Don't have them yet...

Looking to drive 90% street (daily driver) with occasional autocross, like 4-6 events per season. Not super serious but I am competitive in the sense that I want as much performance as I can get. Wanted RE-71R's in 245 width...

Can't get RE-71R's in 245's which was what I would prefer. All tires in the 245 width are R compound, which I do not want.

Options

#1 RE-71R in a 235 width (wanted to go wider)

#2 Michelin pilot sport 4s in 245's (benefit of the width I am looking for, great all around summer tire, give up some performance/grip and durability in autocross).

Any opinions or suggestions welcome!

Also plan was to keep as stock as possible. Not looking for coil overs etc. Might get camber plates (if needed) and call it good. Was hoping 245's coexisted under my wheel arches without any trouble.
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      04-06-2020, 01:41 PM   #20
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Quote:
Originally Posted by FCBuff View Post
Options

#1 RE-71R in a 235 width (wanted to go wider)

#2 Michelin pilot sport 4s in 245's (benefit of the width I am looking for, great all around summer tire, give up some performance/grip and durability in autocross).

Any opinions or suggestions welcome!
Decide which is more important, the performance or the day-to-day livability.

The Yokohama A052 in 235/40-18 has an 8.8" tread width vs. the RE-71R's 8.0" in the same tire size, and that's wider than the PS4S' 8.4". This is a comparison test from last year of the A052 vs. the RE-71R (and others):

https://www.tirerack.com/tires/tests...y.jsp?ttid=242.
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      04-07-2020, 07:17 PM   #21
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Quote:
Originally Posted by dradernh View Post
Decide which is more important, the performance or the day-to-day livability.

The Yokohama A052 in 235/40-18 has an 8.8" tread width vs. the RE-71R's 8.0" in the same tire size, and that's wider than the PS4S' 8.4". This is a comparison test from last year of the A052 vs. the RE-71R (and others):

https://www.tirerack.com/tires/tests...y.jsp?ttid=242.
good info! Thanks!

Strange how there is so much variation in width's...
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      04-07-2020, 07:50 PM   #22
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Quote:
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Strange how there is so much variation in width's...
It's a matter of shoulder design – rounded vs. square. Higher performance tires tend to have a more square-shouldered design, thereby putting more rubber on the road.
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