ARC-8 fitment issue with BC coils. - BMW M5 Forum and M6 Forums
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post #1 of 10 Old 17th June 2019, 07:53 PM Thread Starter
1stoutm5
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ARC-8 fitment issue with BC coils.

Hey guys, so I picked up a square set of ARC-8ís 18x9.5 ET22 running 275/35/18 continental extreme sports tires. The car is fitted with BC coilovers that are just moderately lowered at the moment. So for initial fitment the rears went on without an issue but something weird is going on at the front. I can get the passenger side mounted up but it slightly rubs the shock body. For the drivers side I canít even get the wheel flush on the hub to mount because itís hitting the shock body. Whatís causing the difference between the sides ?

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post #2 of 10 Old 18th June 2019, 08:32 PM Thread Starter
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Update... Apex sent me 1 wrong wheel.. seems itís the small hub bore size. Kicker is they donít have any E39 fitment in stock.


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post #3 of 10 Old 18th June 2019, 10:12 PM
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So was it hitting the shock or not going over there hub?

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post #4 of 10 Old 19th June 2019, 08:38 PM Thread Starter
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Quote:
Originally Posted by josiahg52 View Post
So was it hitting the shock or not going over there hub?


The fronts will lightly scrub the shocks but Apex also sent me a wheel sized for E46 hubs.


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post #5 of 10 Old 19th June 2019, 10:23 PM
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damn...Apex is in a pickle now because they usually only produce the E39 wheels when a bunch of people agree to a group buy. Are you running 3mm spacers up front? I am not an expert with the APEX wheels but 9.5" style 65s require a 3mm spacer at least up front, depending on the coilover brand. I have had both BCs and Ground Controls, and the Ground Controls offer more room when optioned with extra clearance.
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post #6 of 10 Old 20th June 2019, 01:34 AM
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Well, a good machine shop can bore the hub. I don't like it but it can be done. How did Apex end up with THREE wheels, I wonder?

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post #7 of 10 Old 20th June 2019, 03:15 AM
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I am running a square set-up VMR 18x9.5 ET22 with the exact same tire as you (great tire btw). I believe I run a 3mm spacer in the front and 5mm in the rear with rolled lips.
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post #8 of 10 Old 20th June 2019, 04:48 AM Thread Starter
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Quote:
Originally Posted by uhad2point View Post
damn...Apex is in a pickle now because they usually only produce the E39 wheels when a bunch of people agree to a group buy. Are you running 3mm spacers up front? I am not an expert with the APEX wheels but 9.5" style 65s require a 3mm spacer at least up front, depending on the coilover brand. I have had both BCs and Ground Controls, and the Ground Controls offer more room when optioned with extra clearance.


Apex is gonna reimburse me to have the wheel machined locally. But yes Iím gonna have to run a spacer up front. The tires just barely rub the shock body


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post #9 of 10 Old 20th June 2019, 04:51 AM Thread Starter
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Originally Posted by josiahg52 View Post
Well, a good machine shop can bore the hub. I don't like it but it can be done. How did Apex end up with THREE wheels, I wonder?


Thatís a good question, when I initially contacted them about it they were very aloof and were kinda stumped in how they were gonna fix the issue. I was the one that brought up having the wheel machined. Not a good experience with them personally.


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post #10 of 10 Old 21st June 2019, 02:24 AM
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Just make sure they bore it deep enough. Just bring an examplar wheel in and say you want this one to be enlarged to match this one.

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