Apex ARC8 17" vs. 18", Offset, and Tire Size Questions

[slater]

I will be putting my 17x9 et30 with a 245/40/r17 square on my ZHP this spring when I get the coilovers on.

I am a bit concerned about fitment. Anyone running this setup? I will probably have to roll my fenders but fingers crossed I don't have to get to wild.

17x9 ET30 is too low of an offset for a ZHP. you'd be better off selling the wheels and getting the 17x9 ET42 model, which i think are even too much for the front.

[D1ESEL]

I am going to get the coilovers installed and then go from there. I know it is going to be aggressive as they were on my e36 M but we will see.

[derbo]

17x9 ET30 is too low of an offset for a ZHP. you'd be better off selling the wheels and getting the 17x9 ET42 model, which i think are even too much for the front.

It's one tight fit even with my ground control coilovers which removes the large spring perch.

This picture is with my 17x8.5 +40

[09mageec]

Guys, I spoke with a fitment specialist at Apex just yesterday before seeing this thread.

When I go to buy this spring (maybe group buy) I will more than likely be going with an arc-8 square setup, running 18x9, and 255/35/r18 with an offset of 42, which were all recommended after a nice long talk about how the concave (which I YEARN for) will never be an ideal setup from a performance standpoint concerning the non M e46 . So shallow face it is..

I was asked what my plan for the car was, which is a street car (not daily driven) that can be taken to the track as well. I also specified that I want a nice meaty fitment as far as rubber goes. I am already sitting on BC coils with camber plates.

Do any members run this wheel setup currently (preferably hyper black!), or plan on running it in the future?

I'd also recommend that anyone who has questions, do not to hesitate to call Apex directly. They are VERY helpful with fitment advise/questions.


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[slater]

It's one tight fit even with my ground control coilovers which removes the large spring perch.

This picture is with my 17x8.5 +40

whoa! that is a tight fit.

Guys, I spoke with a fitment specialist at Apex just yesterday before seeing this thread.

When I go to buy this spring (maybe group buy) I will more than likely be going with an arc-8 square setup, running 18x9, and 255/35/r18, which was recommended after a nice long talk about how the concave (which I YEARN for) will never be an ideal setup from a performance standpoint. So shallow face it is..

yep. it's too wide for our cars and will introduce tramlining, increased wheel bearing wear, etc. not to mention the need for fender rolling and/or pulling. just ain't worth it to 'look cool' in my opinion.

[09mageec]

yep. it's too wide for our cars and will introduce tramlining, increased wheel bearing wear, etc. not to mention the need for fender rolling and/or pulling. just ain't worth it to 'look cool' in my opinion.

Yeah man, it really made me ponder other wheel options. However, if you're willing to put aesthetics aside, and take the arc8 for what they are, they are SUPERB set of wheels. Truly performance geared in all aspects of their manufacturing.


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[slater]

Yeah man, it really made me ponder other wheel options. However, if you're willing to put aesthetics aside, and take the arc8 for what they are, they are SUPERB set of wheels. Truly performance geared in all aspects of their manufacturing.

agreed. i would love a set of 18x8.5 ET45. just too much $ in CAD right now.

[BMWCurves]

Read this small blurb in this in February 2016's Car and Driver magazine. I thought it was interesting, if far from scientific or definitive. But it does show that lighter wheels can have an affect on performance:

[slater]

wow, cool find william! those results are staggering. granted, they are 14lb and 15lb weight differences, but still! that's some major acceleration improvements.

my stock wheels with michelin PSS weigh about 51-52lbs each. my 17" Style 68s with michelin PS AS3's weigh about 42lbs each. pretty noticeable different behind the wheel (ha), to me.

[BMWCurves]

Yeah, I was pretty surprised as well. I know the above article is not entirely scientific, but I know lighter wheels i.e. reduced unsprung weight is supposed to improve handling and ride. What I didn't realize is that it could have a drastic effect on acceleration. Granted, our cars are significantly down on power and torque compared to the Mustang in the article so we probably won't see that kind of performance change, but I'm still there's performance improvement to be had, as you say you feel on your Style 68s.

I'm very excited for my ARC-8s to arrive. Between the ARC-8's 17.2 lbs per wheel, 22 lbs for the Continental tires, and 3/1 lbs front/rear for the BMW Performance drilled rotors means it should be a net weight loss of 15 lbs on each corner in unsprung weight.