20" Wheel Fitment and Rubbing Issues

shaneguags · 12-16-2021, 11:42 PM

Hello, I currently am looking at a staggered set of wheels with 20x9.5 et30 (fronts), 20x10.5 et34 (rears) with Michelin pilot sport 4 tires 265/30 (front) 295/30 (rear) and I am currently on lowering springs. The guy told me he is on stock suspension and may need to run camber. Does anyone know if I could run these with less wide tires, or even better the same tires that are already on the car ? The website says that the recommend tires are 265/295 but I doubt I can run this without rubbing like crazy. I currently own OEM BMW M performance 373M wheels 20x8.5 et33 (front), 20x9 et44 (rear) and the wheels do rub but only on bumps. Down below are fitment pictures with the wheels I'm looking to buy (on stock suspension), as well as fitment pictures of my 373M wheels I have (on lowering springs).

Thanks, Shane

Carrera2RS · 12-17-2021, 06:36 AM

The best way of checking is to use your current wheels as a guide and see what clearances you have and do the maths on the wheel movements, I think the rears will be problematic at et34 and with that size tyre

shaneguags · 12-17-2021, 11:06 AM

Quote:

Originally Posted by Carrera2RS

The best way of checking is to use your current wheels as a guide and see what clearances you have and do the maths on the wheel movements, I think the rears will be problematic at et34 and with that size tyre

yeah I was thinking the same thing. like you said, it's more so the rears that will probably rub. I might have to drop down to a 275 but I don't even know if that will clear

I'm thinking about just driving down and testing them on but not sure if I wanna drive an hour and a half for nothing

Carrera2RS · 12-18-2021, 02:51 AM

I know 10.5 et 35 are sold by BBS but I think they are marginal with 265/275 and can be problematic on lowered cars. I am running et22 9.5 at the front but have 2.25 degrees if front camber. My set up is 9.5 et22 F, 10.5 et 42 R, quite a lot of room with 245/265, I intend to move to 255/275 35 profile

As I run over 2 degrees of camber at the back I think I could run at much as 34 offset but without some tyre roll I think t would be tight.

I degree of camber is around 5mm of clearance at the wheel (camber pulls the top in at the front and I believe the sam at the back)

shaneguags · 12-19-2021, 12:20 AM

Quote:

Originally Posted by Carrera2RS

I know 10.5 et 35 are sold by BBS but I think they are marginal with 265/275 and can be problematic on lowered cars. I am running et22 9.5 at the front but have 2.25 degrees if front camber. My set up is 9.5 et22 F, 10.5 et 42 R, quite a lot of room with 245/265, I intend to move to 255/275 35 profile

As I run over 2 degrees of camber at the back I think I could run at much as 34 offset but without some tyre roll I think t would be tight.

I degree of camber is around 5mm of clearance at the wheel (camber pulls the top in at the front and I believe the sam at the back)

so you think I'd probably need camber without a doubt ? I'm pretty inexperienced with camber myself, what's it like and what's the process to have it done like ? seems like a headache

: I think the fronts wouldn't need camber to be honest, provably just the rear right ?

Carrera2RS · 12-19-2021, 09:59 AM

I think the rear is done by adjustment and there is sufficient adjustability on the M2. So its taking it to a suspension specialist, the front is only adjustable with aftermarket camber plates or new alloy hubs. The plates move to the top strut inward adding camber the new hubs are machined with 1/2 degree more camber

I tried camber plated but disliked the transfer of NVH to the chassis. So replaced with new hubs (£600 or so a pair, much less than I thought) slightly more expensive to fit and no more adjustability than stock

Running lower Litchfield suspension and there settings with negative camber hubs is superb

The extra camber and revised settings has significantly improved feel and turn in and increased the levels of grip and confidence in large sweeping corners as well as tight turns. The downsides are a little more sensitivity to bumps and uneven surfaces as this can lead the car off track. But this just feels more sensitive and less blunt so for me not really a downside. Tyre wear will be slightly higher on the inner edges

The car feels massively more 'chuckable' and as you load up the suspension it feels tighter and grippier

Im around 2.25 F and 2 R

12-16-2021, 11:42 PM	#1
shaneguags Major 1188 Rep 1,242 Posts Drives: 2017 Big Turbo BMW M2 Join Date: May 2021 Location: Tampa, FL iTrader: (0) Garage List 2017 BMW M2 [9.42]	20" Wheel Fitment and Rubbing Issues Hello, I currently am looking at a staggered set of wheels with 20x9.5 et30 (fronts), 20x10.5 et34 (rears) with Michelin pilot sport 4 tires 265/30 (front) 295/30 (rear) and I am currently on lowering springs. The guy told me he is on stock suspension and may need to run camber. Does anyone know if I could run these with less wide tires, or even better the same tires that are already on the car ? The website says that the recommend tires are 265/295 but I doubt I can run this without rubbing like crazy. I currently own OEM BMW M performance 373M wheels 20x8.5 et33 (front), 20x9 et44 (rear) and the wheels do rub but only on bumps. Down below are fitment pictures with the wheels I'm looking to buy (on stock suspension), as well as fitment pictures of my 373M wheels I have (on lowering springs). Thanks, Shane Attached Images
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12-17-2021, 06:36 AM	#2
Carrera2RS First Lieutenant 203 Rep 303 Posts Drives: BMW M2 Join Date: Oct 2016 Location: UK iTrader: (0)	The best way of checking is to use your current wheels as a guide and see what clearances you have and do the maths on the wheel movements, I think the rears will be problematic at et34 and with that size tyre
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12-18-2021, 02:51 AM	#4
Carrera2RS First Lieutenant 203 Rep 303 Posts Drives: BMW M2 Join Date: Oct 2016 Location: UK iTrader: (0)	I know 10.5 et 35 are sold by BBS but I think they are marginal with 265/275 and can be problematic on lowered cars. I am running et22 9.5 at the front but have 2.25 degrees if front camber. My set up is 9.5 et22 F, 10.5 et 42 R, quite a lot of room with 245/265, I intend to move to 255/275 35 profile As I run over 2 degrees of camber at the back I think I could run at much as 34 offset but without some tyre roll I think t would be tight. I degree of camber is around 5mm of clearance at the wheel (camber pulls the top in at the front and I believe the sam at the back) Attached Images
	Appreciate 1 shaneguags1188.00 Quote

12-19-2021, 09:59 AM	#6
Carrera2RS First Lieutenant 203 Rep 303 Posts Drives: BMW M2 Join Date: Oct 2016 Location: UK iTrader: (0)	I think the rear is done by adjustment and there is sufficient adjustability on the M2. So its taking it to a suspension specialist, the front is only adjustable with aftermarket camber plates or new alloy hubs. The plates move to the top strut inward adding camber the new hubs are machined with 1/2 degree more camber I tried camber plated but disliked the transfer of NVH to the chassis. So replaced with new hubs (£600 or so a pair, much less than I thought) slightly more expensive to fit and no more adjustability than stock Running lower Litchfield suspension and there settings with negative camber hubs is superb The extra camber and revised settings has significantly improved feel and turn in and increased the levels of grip and confidence in large sweeping corners as well as tight turns. The downsides are a little more sensitivity to bumps and uneven surfaces as this can lead the car off track. But this just feels more sensitive and less blunt so for me not really a downside. Tyre wear will be slightly higher on the inner edges The car feels massively more 'chuckable' and as you load up the suspension it feels tighter and grippier Im around 2.25 F and 2 R
	Appreciate 1 shaneguags1188.00 Quote