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      05-07-2013, 11:33 AM   #1
Bodie217
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245/40/18 front fitment issues

Made this unfortunate discovery the hard way the the shop yesterday.

While my strut setup may be partially to blame, I thought I would share my experience.

Wheels: Apex Arc-8, standard 135i staggered set up (8.5/9.5)
Tires: Falken Azenis RT615K, 245/40/18 front, 265/35/18 rear
Suspension: Ohlins DFV Coilovers with Vorshlag plates, M3 control arms
Others: Rolled fenders, front bumper trimmed by wheel to prevent rubbing

One issue with the Azenis 40 series tire is that they are taller than the stock tire, causing it to rub on the strut perch under load as well as on the fender well just behind the front bumper. One factor is the slightly lowered suspension, but all of this can be corrected with a 7mm spacer and 2+ degrees of camber.

The larger issue still remains - the width of the tire. In order to get the wheel/tire to clear the strut, a 7mm spacer was required. In order for it to not rub the strut, a 10mm spacer was required, however that caused the wheel/tire to stick out past the fender so excessively that even with 2.5 degrees of camber, fender rubbing still occurred under load.

Proposed Solution: 235/40/18 RT615k's, 7mm spacer, 2.5 degrees camber. Won't know until later this week. Will post updates -

Note: still tons of room in the rear with the 265's, will be running spacers to make them sit more flush (rear fenders are rolled too)
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      05-07-2013, 11:44 AM   #2
first350
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I'm running 235/40/18 Dunlop ZII's on the same wheels, on M-sport suspension, and -0.5 camber...no rubbing for me.
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      05-07-2013, 12:00 PM   #3
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Tires not available in the proper size of 245/35/18?
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      05-07-2013, 02:48 PM   #4
Bodie217
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Quote:
Originally Posted by MightyMouseTech View Post
Tires not available in the proper size of 245/35/18?
Nope! I tried ordering those from the get-go but no luck. Not sure what the thinking is behind not offering 35 series fronts to match their rears... I'm not a wealth of knowledge on tires sizes... Is 35 an odd size for a front tire?
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      05-07-2013, 04:38 PM   #5
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Quote:
Originally Posted by HomeRun217 View Post
Nope! I tried ordering those from the get-go but no luck. Not sure what the thinking is behind not offering 35 series fronts to match their rears... I'm not a wealth of knowledge on tires sizes... Is 35 an odd size for a front tire?
yep...not many tires offered in a 245/35/18; only ones I remember seeing were R-comps.
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      05-07-2013, 05:48 PM   #6
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Another reason to run 17s!
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      05-08-2013, 06:17 PM   #7
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Have you tried raising the car?
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      05-08-2013, 07:32 PM   #8
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Didn't he say it rubbed on the perch?
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      05-08-2013, 07:39 PM   #9
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Is there 255/35 available? That's what I'm running in the front and have plenty of clearance at -2.1* camber and final ET43. Although, my spring perch is quite a bit above the tire allowing more room. Maybe you should consider getting shorter spring so you can spin the perch above the tire?

Last edited by r0nd3L; 05-08-2013 at 08:17 PM.
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      05-09-2013, 12:28 AM   #10
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Quote:
Originally Posted by PrematureApex View Post
Didn't he say it rubbed on the perch?
The OP stated that the spacer fixed the issue, but not it's rubbing on the fender. I figure raising the car could fix the problem, unless he is set on keeping the ride height where it is.
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      05-13-2013, 04:10 PM   #11
Bodie217
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Quote:
Originally Posted by Artsee View Post
The OP stated that the spacer fixed the issue, but not it's rubbing on the fender. I figure raising the car could fix the problem, unless he is set on keeping the ride height where it is.
Yeah pretty set on keeping the ride height where it is. Any higher and it would be stock level, it's really not lowered much. The issue is where the perch is on the Ohlins vs stock struts.

Problem was resolved with 235/40/18 tires, 10mm spacer, 2.5' camber. Sits very flush
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