275/30R20 PS4S - Rubbing in Front

einscot · 04-01-2018, 08:19 AM

alignment and HAS installation didn't change it - definitely don't buy the 275/30ZR20 for the F80. i can't believe there's a material difference between the F82 and F80 platforms there in the wheel well but I have rubbing like crazy.

Encanto · 04-01-2018, 09:04 AM

Quote:

Originally Posted by cca101

This thread has died quickly! Any reports of another f80 M3 with 275-30-20 PS4s and ZCP OEM wheels not rubbing?

Fixed.

As I said, the 2 F80 in my family are running 275/30-20 (PSS and PS4S) in 10" aftermarket wheels (ET25 and ET23) without any rubbing in the front.

prodigymb · 04-01-2018, 10:50 AM

those tires are too wide for OEM ZCP wheels, i don't get why people do this...

putting a tire over square on the front will make steering feel worse.

Sunny D · 04-01-2018, 09:02 PM

Are ZCP 666 rims 20x9 and 20x10? Is so, maybe they used a rear rim on the front?

BoxKing · 04-01-2018, 10:11 PM

Quote:

Originally Posted by prodigymb

those tires are too wide for OEM ZCP wheels, i don't get why people do this...

putting a tire over square on the front will make steering feel worse.

They work just fine for me. Full turn test approved.

whoop_ass · 04-01-2018, 11:03 PM

Quote:

Originally Posted by BoxKing

They work just fine for me. Full turn test approved.

we have gathered that it's not a problem on F82, its the f80 that have issue's
you drive an F82 correct?

prodigymb · 04-02-2018, 09:07 AM

Quote:

Originally Posted by BoxKing

They work just fine for me. Full turn test approved.

just because the fit doesn't mean that its beneficial in any way.

whoop_ass · 04-02-2018, 10:11 AM

Quote:

Originally Posted by prodigymb

just because the fit doesn't mean that its beneficial in any way.

I agree with you 100%

CanAutM3 · 04-02-2018, 10:38 AM

Quote:

Originally Posted by Encanto

Fixed.

As I said, the 2 F80 in my family are running 275/30-20 (PSS and PS4S) in 10" aftermarket wheels (ET25 and ET23) without any rubbing in the front.

The wheel width will have very little effect on the installed tire tread width. So IMO, it is all about the wheel offset. For sure, moving the tire centerline 4~6mm inboard will help reduce the risk of rubbing in the fender liner when the wheels are steered..

CanAutM3 · 04-02-2018, 10:41 AM

Quote:

Originally Posted by cca101

Drawing screen shot

Interesting chart.

How did you establish the scrub radius (50mm rotation point from center line) ?

I looked for it, but could not find any direct info for the F8X platform.

cca101 · 04-02-2018, 10:58 AM

Quote:

Originally Posted by CanAutM3

Interesting chart.

How did you establish the scrub radius (50mm rotation point from center line) ?

I looked for it, but could not find any direct info for the F8X platform.

That was pretty much a guess, I'm not sure how far the hub/rotor is from the rotation point.

The mystery is how do these fit on the M4 but not M3. Also there's so many contradicting opinion on this setup. In another post OP swears it's the only way, but here it's laughed at.

einscot · 04-02-2018, 11:28 AM

Quote:

Originally Posted by cca101

That was pretty much a guess, I'm not sure how far the hub/rotor is from the rotation point.

The mystery is how do these fit on the M4 but not M3. Also there's so many contradicting opinion on this setup. In another post OP swears it's the only way, but here it's laughed at.

i appreciate that there are still people who are helping work through this with me.

i have the 666 wheels, now have MP HAS Suspension, and all I did was go from 265 MPSS to 275 PS4S - somehow others seem to have this set up without issue, but yet mine rubs once wheel gets close to lock. i don't have spacers or anything like that, and it was rubbing well before the suspension was installed. i took a leap of faith on what i'd read so far that this wasn't going to rub. i asked more than a handful of owners with the same wheels and standard suspension and all said they had no problems.

i guess i'll be going down to 265s in the front to remedy it.

Encanto · 04-02-2018, 02:43 PM

Quote:

Originally Posted by CanAutM3

The wheel width will have very little effect on the installed tire tread width. So IMO, it is all about the wheel offset. For sure, moving the tire centerline 4~6mm inboard will help reduce the risk of rubbing in the fender liner when the wheels are steered..

Every mm counts...

einscot · 04-04-2018, 05:42 AM

Quote:

Originally Posted by Sunny D

Are ZCP 666 rims 20x9 and 20x10? Is so, maybe they used a rear rim on the front?

yeah - ZCP 666 are Front - 20x9 (stock ET is 29) and Rear - 20x10 (stock ET is 40).

at this point i'm completely baffled - way too many reports of others running same set up as I have with no other reports of rubbing. I am taking to an indy tire shop to see if the dealer accidentally put a 20x10 in front instead of on the rear. which would seem odd, and would mean one of my rears is a 20x9 with a 295 tire on it. let's hope this is the issue.

CanAutM3 · 04-04-2018, 06:11 AM

Quote:

Originally Posted by einscot

yeah - ZCP 666 are Front - 20x9 (stock ET is 29) and Rear - 20x10 (stock ET is 40).

at this point i'm completely baffled - way too many reports of others running same set up as I have with no other reports of rubbing. I am taking to an indy tire shop to see if the dealer accidentally put a 20x10 in front instead of on the rear. which would seem odd, and would mean one of my rears is a 20x9 with a 295 tire on it. let's hope this is the issue.

Having a rear wheel installed up front would actually reduce the probability of rubbing on the fender liner because the tire centre line would be 11mm more inward due to the larger offset.

whoop_ass · 04-04-2018, 06:47 AM

Quote:

Originally Posted by CanAutM3

Having a rear wheel installed up front would actually reduce the probability of rubbing on the fender liner because the tire centre line would be 11mm more inward due to the larger offset.

not only that it would hit the strut, been a 40 offset wheel, they would not even get the wheel onto hub.

einscot · 04-04-2018, 07:16 AM

Quote:

Originally Posted by whoop_ass

Quote:

Originally Posted by CanAutM3

Having a rear wheel installed up front would actually reduce the probability of rubbing on the fender liner because the tire centre line would be 11mm more inward due to the larger offset.

not only that it would hit the strut, been a 40 offset wheel, they would not even get the wheel onto hub.

good to know - i clearly am grasping at straws here at this point so wasn't thinking that through all the way.

well then, time to sell the 275s in the forums.

einscot · 04-04-2018, 07:18 AM

Quote:

Originally Posted by CanAutM3

Quote:

Originally Posted by einscot

yeah - ZCP 666 are Front - 20x9 (stock ET is 29) and Rear - 20x10 (stock ET is 40).

at this point i'm completely baffled - way too many reports of others running same set up as I have with no other reports of rubbing. I am taking to an indy tire shop to see if the dealer accidentally put a 20x10 in front instead of on the rear. which would seem odd, and would mean one of my rears is a 20x9 with a 295 tire on it. let's hope this is the issue.

Having a rear wheel installed up front would actually reduce the probability of rubbing on the fender liner because the tire centre line would be 11mm more inward due to the larger offset.

thanks for reminding me of that as well

disappointed that i jumped into this transaction without clearly making sure on my own it would work

BoxKing · 04-04-2018, 08:17 AM

Quote:

Originally Posted by prodigymb

just because the fit doesn't mean that its beneficial in any way.

Hmmm: better traction all around, handle/cornering feels stiffer, no fitment issues. Those are the benefits, I have yet to find anything in the negative column, except for the OP's issue with rubbing.

I'm open ears to the downsides to this arrangement, and I'd would swap if there are any substantial reasons to go back to 265 in the Front.

prodigymb · 04-04-2018, 08:46 AM

Quote:

Originally Posted by BoxKing

Hmmm: better traction all around, handle/cornering feels stiffer, no fitment issues. Those are the benefits, I have yet to find anything in the negative column, except for the OP's issue with rubbing.

I'm open ears to the downsides to this arrangement, and I'd would swap if there are any substantial reasons to go back to 265 in the Front.

have you actually measured and quantified any of those with a VBox or just going by seat of the pants feel.... because that is often deceptive...

BoxKing · 04-04-2018, 12:27 PM

Quote:

Originally Posted by prodigymb

have you actually measured and quantified any of those with a VBox or just going by seat of the pants feel.... because that is often deceptive...

Considering I had to look up "VBox" should let you know that I'm flying by the seat of my pants! Im no technical guru when it comes to wheels and tires.
I can speak on behalf of the traction difference mainly from the rears- its night and day, and if only in my case, I have no fitment issues.

BoxKing · 04-05-2018, 08:22 PM

Based on rubbing and the fact I have no issues in my F82. Does anyone feel ill have an issue if I lower on Swift R springs? They're sitting under my desk!

04-01-2018, 08:19 AM	#45
einscot Banned 407 Rep 559 Posts Drives: '17 f80 ZCP, '94 d90, '13 x5d Join Date: Oct 2016 Location: tampa bay iTrader: (0)	alignment and HAS installation didn't change it - definitely don't buy the 275/30ZR20 for the F80. i can't believe there's a material difference between the F82 and F80 platforms there in the wheel well but I have rubbing like crazy.
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04-01-2018, 10:50 AM	#47
prodigymb Captain 208 Rep 618 Posts Drives: V10+ R8, 997TT, Plaid, G550 Join Date: Apr 2008 Location: Mexico iTrader: (2)	those tires are too wide for OEM ZCP wheels, i don't get why people do this... putting a tire over square on the front will make steering feel worse.
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04-01-2018, 09:02 PM	#48
Sunny D Second Lieutenant 47 Rep 250 Posts Drives: 2017 F80 ZCP Join Date: Sep 2012 Location: ATL iTrader: (2)	Are ZCP 666 rims 20x9 and 20x10? Is so, maybe they used a rear rim on the front?
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04-05-2018, 08:22 PM	#66
BoxKing I Rock Your Girls Box 293 Rep 662 Posts Drives: M4 F82 ZCP AW Join Date: Nov 2016 Location: Philadelphia iTrader: (1)	Based on rubbing and the fact I have no issues in my F82. Does anyone feel ill have an issue if I lower on Swift R springs? They're sitting under my desk!
	Appreciate 0 Quote