04-16-2019, 06:36 PM | #1 |
Enlisted Member
26
Rep 44
Posts |
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 |
04-16-2019, 11:06 PM | #2 |
Lieutenant
316
Rep 444
Posts |
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.. |
Appreciate
0
|
04-17-2019, 06:34 PM | #3 |
Enlisted Member
64
Rep 36
Posts |
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. |
Appreciate
0
|
04-20-2019, 12:15 PM | #4 |
Colonel
1330
Rep 2,214
Posts |
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
__________________
|
Appreciate
0
|
03-21-2020, 10:45 AM | #7 | |
Colonel
3848
Rep 2,873
Posts |
Quote:
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. |
|
Appreciate
1
Dylan861330.00 |
03-21-2020, 11:35 AM | #8 | |
Private
32
Rep 95
Posts |
Quote:
|
|
Appreciate
0
|
03-21-2020, 07:43 PM | #9 |
Lieutenant
316
Rep 444
Posts |
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.
__________________
17x9 APEX Arc8-R, 255/40/17 RE71RS, Vorshlag Plates, Swift Spec-R Springs, m-Performance Bumpstops, Dinan ShockWare, Paragon 2-piece rotors, Carbon lip, custom 3" alumalite splitter, GTS wing, FTP Intake and Charge pipe, BootMod3 Stage 1 OTS
|
Appreciate
1
dradernh4414.50 |
03-21-2020, 08:17 PM | #10 |
Brigadier General
4415
Rep 3,497
Posts |
Well said - I believe this is excellent advice.
__________________
2017 M240i: 23.8K, 28.9 mpg, MT, Sunroof Delete, 3,432#, EB, Leather, Driving Assistance Package, Heated Front Seats | Sold: E12 530i, E24 M635CSi, E39 520i, E30 325is, E36 M3 (2)
TC Kline Coilovers; H&R Front Bar; Wavetrac; Al Subframe Bushings; 18X9/9½ ARC-8s; 255/35-18 PS4S (4); Dinan Elite V2 & CAI; MPerf Orange BBK; Schroth Quick Fit Pro; GTechniq Crystal Serum Ultra Ceramic; Suntek PPF |
Appreciate
0
|
03-22-2020, 11:24 AM | #11 | ||
Private
32
Rep 95
Posts |
Quote:
Quote:
|
||
Appreciate
0
|
03-22-2020, 11:47 PM | #12 |
Lieutenant
316
Rep 444
Posts |
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.
__________________
17x9 APEX Arc8-R, 255/40/17 RE71RS, Vorshlag Plates, Swift Spec-R Springs, m-Performance Bumpstops, Dinan ShockWare, Paragon 2-piece rotors, Carbon lip, custom 3" alumalite splitter, GTS wing, FTP Intake and Charge pipe, BootMod3 Stage 1 OTS
|
Appreciate
1
ifobd32.00 |
03-24-2020, 10:47 AM | #13 | |
Colonel
1330
Rep 2,214
Posts |
Quote:
D
__________________
|
|
04-02-2020, 05:45 PM | #14 | ||
Private
32
Rep 95
Posts |
Quote:
|
||
Appreciate
0
|
04-02-2020, 06:48 PM | #15 | |
Lieutenant
316
Rep 444
Posts |
Quote:
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.
__________________
17x9 APEX Arc8-R, 255/40/17 RE71RS, Vorshlag Plates, Swift Spec-R Springs, m-Performance Bumpstops, Dinan ShockWare, Paragon 2-piece rotors, Carbon lip, custom 3" alumalite splitter, GTS wing, FTP Intake and Charge pipe, BootMod3 Stage 1 OTS
Last edited by 230iZTR; 04-02-2020 at 07:02 PM.. |
|
Appreciate
0
|
04-02-2020, 06:52 PM | #16 |
Major General
3530
Rep 6,752
Posts |
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
__________________
925-245-0773 /// info@apexraceparts.com
Wheels /// Accessories /// Vehicle-Specific Fitment Guides /// Careers |
04-03-2020, 02:38 PM | #17 | |
Colonel
1330
Rep 2,214
Posts |
Quote:
D
__________________
|
|
Appreciate
1
WolfGTI716.00 |
04-05-2020, 10:27 PM | #18 |
Second Lieutenant
150
Rep 251
Posts |
Any more photos of his car on this setup?
|
Appreciate
0
|
04-06-2020, 01:12 PM | #19 |
Enthusiast
84
Rep 229
Posts |
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.
__________________
_______________________________________
2016 M235i XDrive Estoril Blue/Black |
Appreciate
0
|
04-06-2020, 01:41 PM | #20 | |
Brigadier General
4415
Rep 3,497
Posts |
Quote:
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.
__________________
2017 M240i: 23.8K, 28.9 mpg, MT, Sunroof Delete, 3,432#, EB, Leather, Driving Assistance Package, Heated Front Seats | Sold: E12 530i, E24 M635CSi, E39 520i, E30 325is, E36 M3 (2)
TC Kline Coilovers; H&R Front Bar; Wavetrac; Al Subframe Bushings; 18X9/9½ ARC-8s; 255/35-18 PS4S (4); Dinan Elite V2 & CAI; MPerf Orange BBK; Schroth Quick Fit Pro; GTechniq Crystal Serum Ultra Ceramic; Suntek PPF |
|
Appreciate
1
WolfGTI716.00 |
04-07-2020, 07:17 PM | #21 | |
Enthusiast
84
Rep 229
Posts |
Quote:
Strange how there is so much variation in width's...
__________________
_______________________________________
2016 M235i XDrive Estoril Blue/Black |
|
Appreciate
0
|
04-07-2020, 07:50 PM | #22 |
Brigadier General
4415
Rep 3,497
Posts |
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.
__________________
2017 M240i: 23.8K, 28.9 mpg, MT, Sunroof Delete, 3,432#, EB, Leather, Driving Assistance Package, Heated Front Seats | Sold: E12 530i, E24 M635CSi, E39 520i, E30 325is, E36 M3 (2)
TC Kline Coilovers; H&R Front Bar; Wavetrac; Al Subframe Bushings; 18X9/9½ ARC-8s; 255/35-18 PS4S (4); Dinan Elite V2 & CAI; MPerf Orange BBK; Schroth Quick Fit Pro; GTechniq Crystal Serum Ultra Ceramic; Suntek PPF |
Appreciate
0
|
Post Reply |
Bookmarks |
Tags |
17inch square, re71 |
|
|