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Originally Posted by GeoBem007
No offence, but are you sure about your wheel specs?
'cause if you're saying you're running a 10mm spacer in the front, that means your wheel spec goes to 18x8.5 ET25. I don't know exactly how it is on 2-series, but on my 1-series 18x8.5ET40 was already pushing it...
Otherwise, great looking 2-series. One of the nicest out there. Only a dislike for the BBS sticker on non-BBS wheels  |
Since the car is located in Leeds, we were able to look in our records and confirm a recent shipment of 18x8.5" ET35 wheels. Looking at the photos and seeing how flush the rear wheel is, it also confirms that they are 18x8.5" ET35 all around. It's not a fitment advisable to most people, so I'll explain below. It looks absolutely stunning though and we appreciate difficult fitments and beautiful cars
From the look of the photos this car is reusing the stock 225/40/18 Michelin super sports stretched up front, and the stock 245/35/18 in the rear. The stretched tires are helping this fitment work.
ET35 with a 10mm spacer up front is extremely, extremely aggressive for the 2 series and 1 series. Because the front wheels are turned in the photos and the tires are stretched, there is no reference point to gain a sense of perspective on the front fitment. 18x8.5" ET35 with a 235/40/18 extreme summer tire rubs the front fender on stock cars, so I can see how a 10mm spacer could be used up front to push the wheel out when stretching a 225 tire. If a photograph was taken directly from the front down the side of the car, the front wheel is almost certainly protruding from the fender unless this car has camber plates installed, with a lot of camber dialed in. I don't believe KW V3 kits include plates though.
The offsets of this configuration are much more aggressive than what we would advise for a track setup, under compression the rear will likely rub at ET35 as this is 23mm more aggressive in the rear with the same size tire. If a 10mm spacer is being used up front, that makes the front 33mm more aggressive. Even with a stretched tire, it's really pushing it for most members on the forum.
The 2 series specific square setup is 18x8.5" ET45, although a staggered 18x8.5" ET45 Front and 18x9.5" ET58 rear is an even easier fit, due to 2 series specific rear offset.
Quote:
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Originally Posted by nieue
KW 3 Way Suspension (three spec)
(It will run Pilot Sport Cups/ Dunlop Dirreza for track 235/40/18)
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In your Original post, you mention wanting to eventually run Pilot Sport Cups or Dunlop Direzza tires in a 235 size. You'll need to pay very close attention to your wheel/tire/suspension setup both up front and in the rear if you decide to change to a meatier or wider tire.
The front 10mm spacer could definitely not be used, when moving away from the stretched tire. ET35 will still be a concern, but if you get camber plates and run about -2 degrees it will clear the fender properly. At ET35 you should not encounter any suspension clearance issues with your KW V3 suspension, but it could be very close.
Below is a fitment test of an 18x8.5" ET45 EC-7 with a 235/40/18 Nitto NT-05 Extreme summer tire. The NT-05 runs narrow for it's overall physical size in comparison to other extreme summer tires, and especially r-compounds.
in the below photos you can see the strut tube clearance at the ET45 offset. It's a very tight fit, but it was designed to keep the 235 tire inside the fender properly on 100% stock cars. Note: this tire has a bead protector, which is what's closest to the strut. Tire shapes vary, so tires without a bead protector will have more clearance, as rim to strut clearance is another 5+ millimeters.
Although you'll have 10mm more clearance on the strut side, you will still have to watch out for potential clearance issues with an r-compound tire if your ride height is set too low. The KW V3 suspension comes with a cone shaped spring. The variant spring shape is long, so it sets the spring perch low. Most likely the lower spring perch is currently next to your front tire. Because you are running a stretched 225 tire and an ET35 offset + a spacer, there is clearance. But when you take the spacer out, and switch to a wider tire like a 235/40/18, you will lose a lot vertical and horizontal strut side clearance as the tire will grow in overall diameter too.
The rear fitment will be negatively impacted with a switch to 235/40/18 as well at the ET35 offset vs. ET45 since a 235/40/18 is over a half an inch taller. A 235 Pilot Sport or Direzza will be physically wider than the current 245 you are running in the rear, which already looks very close to your fender from the pictures.
Below are some photos (at stock ride height) of M235i's running 18x8.5" ET45 with 235/40/18 NT-05 tires. You can see how much meatier and taller 235 tires run.
Below are images of the recommended staggered setup of 18x8.5" ET45 and 18x9.5" ET58. Here you can see that the 9.5" ET58 allows a 265/35/18 extreme summer tire to fit cleanly in the rear. The switch from 8" ET52 to 9.5" ET58 only pushes the wheel out 13mm, but 25mm of it moves in-board. This allows a 265 (and in some cases with careful attention a 275) tire to fit, as 2/3 of the added with is moved inward.
If you were to encounter major rear fitment issues as you switch to meatier tires, one option would be to keep your current front wheels, but switch to the 9.5" ET58 wheel, or you could switch all 4 wheels to the ET45 offset and run the 10mm spacer up front to clear your suspension.
