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      11-16-2018, 01:36 PM   #1
Alan1M
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HRE C20 - BSM 1M - Tight Fit

I have had my eye out for a nice set of polished lip on black wheels for some time. I found a set of HRE C20's over on the E90 forums and decided to buy them. The look is pretty much exactly what I was going for. However, the fitment is tight. Here are the specs on the wheels / tires:

Front
19x8.5 ET 20 / Hankook V12 245/35/19

Rear
19x10.5 ET 20 / Hankook V12 275/35/19

I know the specs on these are a bit dramatic with the 2" difference from front to back. I am not too concerned with the overall performance given I don't drive the car very hard or aggressively.

Here are some photos - my biggest concern is up front. The wheel extends just the slightest bit out past the fender. I am concerned about the tire hitting the fender on compression / bumps. I have H&R Sport Springs which I have not installed. It would complete the look but the fitment would be even tighter. Would the front spring travel be reduced with the Sport springs?





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      11-16-2018, 05:09 PM   #2
Mogge94
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OEM Wheel is a 9.0J +31.
8.5 +20 wheel gives 17mm (!) more clearance on the inside and only sits 5mm farther to the outside. I don´t see any problems whatsoever.

If you want to be absolutely sure, put the front up on a jack stand and put some wooden plank under the tyre to compress the suspension. You will see that there won´t be any remarkable issues. Even more since you are running V12 Evos, which are not known to be specifically large or wide tires.
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      11-17-2018, 08:43 AM   #3
Alan1M
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Quote:
Originally Posted by Mogge94 View Post
OEM Wheel is a 9.0J +31.
8.5 +20 wheel gives 17mm (!) more clearance on the inside and only sits 5mm farther to the outside. I don´t see any problems whatsoever.

If you want to be absolutely sure, put the front up on a jack stand and put some wooden plank under the tyre to compress the suspension. You will see that there won´t be any remarkable issues. Even more since you are running V12 Evos, which are not known to be specifically large or wide tires.
Good idea to test it out. I assume you mean, jack it up, put some wood under the tire and drop it back down? How much suspension travel should I estimate for fully compressed?
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      11-17-2018, 03:25 PM   #4
Mogge94
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I would jack up rear right wheel, put a 2" wood under it, drop it down, then jack up front left and also put a 2"" wood under it, drop it down. That's how we usually do it
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      11-17-2018, 03:30 PM   #5
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Quote:
Originally Posted by Eiremon View Post
I have had my eye out for a nice set of polished lip on black wheels for some time. I found a set of HRE C20's over on the E90 forums and decided to buy them. The look is pretty much exactly what I was going for. However, the fitment is tight. Here are the specs on the wheels / tires:

Front
19x8.5 ET 20 / Hankook V12 245/35/19

Rear
19x10.5 ET 20 / Hankook V12 275/35/19

I know the specs on these are a bit dramatic with the 2" difference from front to back. I am not too concerned with the overall performance given I don't drive the car very hard or aggressively.

Here are some photos - my biggest concern is up front. The wheel extends just the slightest bit out past the fender. I am concerned about the tire hitting the fender on compression / bumps. I have H&R Sport Springs which I have not installed. It would complete the look but the fitment would be even tighter. Would the front spring travel be reduced with the Sport springs?





As others have said, I don't think you will have any clearance problems at all, but make no mistake, you will be giving up compression travel with the shorter Sport Springs!
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      11-17-2018, 04:05 PM   #6
Alan1M
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Thanks - I am not concerned with the reduced travel of the sport springs. I just want to be sure it won’t lead to rubbing issues which might not exist otherwise.
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      11-18-2018, 09:00 PM   #7
Alan1M
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Compression test checks out - still about 1.5” of gap so plenty of room. I’ll drop by a good shop in the spring to explore the H&R Sport option.

I found this interesting post on suspension and springs. My understanding is that in stock form the 1M has 2” of available travel. If the H&R sport lowers the front by 1.2” then you are left with .8” of available travel which is obviously not a lot to play with.

https://www.m3post.com/forums/showthread.php?t=339168

Last edited by Alan1M; 11-18-2018 at 09:19 PM..
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      11-19-2018, 07:05 AM   #8
Mogge94
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I Would recommend you get coilovers. 1M handles like a bag of nuts (that's how we say in Germany ) with short springs only. Have driven them myself in a friends car. 0/10 would never recommend
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