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      11-16-2018, 02:36 PM   #1
Eiremon
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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, 06:09 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 dont 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 wont 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, 09:43 AM   #3
Eiremon
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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 dont 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 wont 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, 04:25 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, 04:30 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, 05:05 PM   #6
Eiremon
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Thanks - I am not concerned with the reduced travel of the sport springs. I just want to be sure it wont lead to rubbing issues which might not exist otherwise.
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      11-18-2018, 10:00 PM   #7
Eiremon
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Compression test checks out - still about 1.5 of gap so plenty of room. Ill 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 Eiremon; 11-18-2018 at 10:19 PM.
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      11-19-2018, 08:05 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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