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      12-09-2020, 06:25 AM   #1
Spacecpe
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F13 M6 20x12 on 335-30-20 HELP

Happy holidays folks. Like the title says I'm having some wheels made for my F13 M6, and I was wondering if anybody here had experience running 335 wide tires on a 12inch wide wheel. I know for a fact a lot of people had 325s in the back but I have yet to come across 335s. The wheels will be 20x10 ET25 and 20x12 ET25 (offsets are on the safe side to have some room to play with small spacers if needed) tires will be 265-35-20 front and hopefully 335-30-20 rear. I know 335s will fit and won't rub the quarter panel, the only thing I'm not sure of is the suspension and wheel liner clearance on the inside.

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      12-09-2020, 09:07 PM   #2
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Anyone?
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      12-09-2020, 10:35 PM   #3
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I've got 325/30r20 sport cup 2 - there is heaps of room to all of the suspension parts but the gap between the arch liner and tyre on the front side of the wheel well is fairly small. My offset is 18mm, I don't think 325/30r20 would clear if the offset was 25mm.
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      12-10-2020, 04:51 AM   #4
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Do you mean the liner in front of the tire and back by the suspension? It seems like that's some people ran into with 325s from my research. Do you think 335-30-20 with a 20 offset would be fine (considering i would find a solution for the liner on the inside)?
Would you mind posting some pics of your setup? Front aswell maybe?
Thank you so much!
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      12-10-2020, 11:17 AM   #5
brad850csi
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Yep, the liner in front of the tyre. My wheels could come in 20x11.5 18mm or 20x12 25mm. I did a test fit with the tyres on the stock 20x10.5 19mm wheels and that convinced me I couldn't do 20x12 25mm.

In fact it was so tight I actually grabbed a piece of paper when the car was up on the ramp and ran it past this pinch point.

I'm actually going to swap them back onto the car soon, probably Monday or Tuesday next week depending on how busy I am. I'll try and take pics of this point when it is up on the ramp.

https://www.6post.com/forums/showthread.php?t=1677487
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      12-10-2020, 03:06 PM   #6
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Sweet, thank you so much! The reason why I'm trying to go with 335 is that a friend is giving me a smoking deal on a set and since the 325s were confirmed I thought 335s shouldn't be too far off. I will also be lowered on H&R springs, not sure if that is gonna help my case or not.

This is the difference I got between stock 295-30-20 20x10.5 ET19 and 335-30-20 20x12 ET25: Compared to the wheel, this new wheel will have an inner rim which is 25.1mm closer to the suspension strut. The outer rim will poke out 13.1mm more than before.

If I consider the OEM wheels with a 12mm spacer (which a lot of people have with no rubbing) and compare it to the 20x12 and drop the offset to ET20, the new setup will poke out the exact distance and will sit 32.1mm deeper than OEM in the wheel well.

All the simulation was done on willtheyfit.com

Last edited by Spacecpe; 12-10-2020 at 03:19 PM..
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      12-12-2020, 12:59 PM   #7
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I think you might find that you need to run a 7-10mm spacer on the rear based on what I've seen - but give it a shot

I actually mounted the 325/30r20 on the stock rear to test it first and it was that which helped me decide on an 18mm offset rear wheel rather than a 25mm. I didn't find a 335/30r20 in NZ at all so I didn't try one.

Just one thing to consider - how old are these tyres and what are they exactly? They might actually be very old or bad tyres like PZeros
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      12-12-2020, 02:57 PM   #8
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I think you're right.. I might have to run a 7mm spacer to get away from the liner, and I have yet to see a setup with 325s in that offset, the minimum I've see was ET20. The tires are 335-30-20 michelin pilot sport, i checked the production date and it's 2013 stock. They are still in good shape from what it seems. Im test fitting the tire today in the wheel well to see how much room I have.
From what I found, the difference between the 325 and 335 is 0.236inch in overall diameter. Unless that amount of space is not available in your current setup, then my wheel liner will need some help so that the tire doesnt rub on it.

Last edited by Spacecpe; 12-13-2020 at 12:47 AM..
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      12-13-2020, 12:08 PM   #9
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I think it is a combination of tyre height and width/offset.

By all means give it a crack and if it doesn't work then go with 325/30r20
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      12-13-2020, 03:30 PM   #10
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Well, i kinda test fitted the tire alone with almost no gap next to the shock and liner, and it looks like there's no it'll fit. Im pretty sure this is not accurate because tge size difference from the 325 is too small for it fit better lol. I think ill just to wait for the wheel and mount the tires and go from there. From my own guessing, maybe the tire alone is relaxed and measure 1.5x the actual size on a wheel lol. I don't know, maybe? Lol
I might take one of the oem wheels and mount tge 335 on it to test. It will look funny but it will give me a good idea.

BTW, thank you so much Brad850csi for your input!
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      12-20-2020, 12:09 PM   #11
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For anybody that's following this thread. I ended up mounting the 335 on the stock 10.5 wheel for test fitting. Seems like the the tire will work, very minimal room left. The true test will be with the H&R springs installed, but I think it will be fine, maybe just a little modification to the liner. About the fender room and if its gonna rub, no idea as the car is stored for winter and can't really drive it. It looks very close to the bumper, might rub where the quarter panel and bumper meet (tbd).
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      12-20-2020, 12:55 PM   #12
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That looks about where I'd expect it to be with 19mm offset. Any chance of some wider angle pictures of it outsied perhaps?
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      12-20-2020, 01:28 PM   #13
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Of the whole backend or just the fitment? Unfortunately I can't move the car, It's been parked for a couple months and there's some snow behind it. Im afraid if I take it out it won't go back in lol
Did you have modify anything at all with your setup? Any trimming or massaging of the fender liner?
Do you mind posting a couple pics of your fitment with the 325s?

Last edited by Spacecpe; 12-20-2020 at 01:37 PM..
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      12-25-2020, 03:16 PM   #14
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Here we go

argghh, were upside down, fixed now
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Last edited by brad850csi; 12-25-2020 at 03:31 PM..
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      12-26-2020, 04:33 AM   #15
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my rear wheel is 11.5 et 25 and i fit 305 tire, i saw there is no space between the tire and suspension, i need to fit 315 tire on rear but i think i will need spacer maybe?
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      12-27-2020, 04:32 PM   #16
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Quote:
Originally Posted by Mr. M6 View Post
my rear wheel is 11.5 et 25 and i fit 305 tire, i saw there is no space between the tire and suspension, i need to fit 315 tire on rear but i think i will need spacer maybe?
You might be close, that would put you 2mm further in than me but the 315/30r20 (assuming here) is 3mm shorter in height so that might give you a bit of extra clearance
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      12-28-2020, 09:00 PM   #17
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That fitment is beautiful!! I'll post a couple pics shortly of the car lowered on H&R with the test fit tire.

Edit: Pics as promised of the 335-30/20 on the OEM wheel for test fitting purposes. Wheels should be here next week and will do a proper test. Looks very tight (not sure if the 335s will work.. tire clears the quarter panel but is very close to the bumper)
Sorry about the 3rd picture. I don't know how to flip it.
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Last edited by Spacecpe; 12-29-2020 at 01:48 AM..
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      12-30-2020, 04:03 AM   #18
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Quote:
Originally Posted by brad850csi View Post
You might be close, that would put you 2mm further in than me but the 315/30r20 (assuming here) is 3mm shorter in height so that might give you a bit of extra clearance
i will need spacer for 315/30/20? or it will fit without spacer? risky?
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      12-30-2020, 01:14 PM   #19
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Quote:
Originally Posted by Mr. M6 View Post
i will need spacer for 315/30/20? or it will fit without spacer? risky?
You’ll be damned close, that’s for sure! I actually don’t know if you will or not
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      12-31-2020, 12:42 AM   #20
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Quote:
Originally Posted by brad850csi View Post
Yep, the liner in front of the tyre. My wheels could come in 20x11.5 18mm or 20x12 25mm. I did a test fit with the tyres on the stock 20x10.5 19mm wheels and that convinced me I couldn't do 20x12 25mm.

In fact it was so tight I actually grabbed a piece of paper when the car was up on the ramp and ran it past this pinch point.

I'm actually going to swap them back onto the car soon, probably Monday or Tuesday next week depending on how busy I am. I'll try and take pics of this point when it is up on the ramp.

https://www.6post.com/forums/showthread.php?t=1677487
Very interesting thread! In fact I'm looking to run a 335/30/20 Michelin PSS as well. brad850csi, I actually took inspiration from a post you made a while back when you had your ferradas put on. In fact, I went with the exact same model and color of Ferrada, same front spec as you, however I did opt for the 20x12 et25. Running the same 325/30/20 sport cup 2 (mine are the Mercedes spec, not sure what you're on. Difference is the Merc spec tires are .2" wider tread overall). Fit perfectly, zero rubbing on stock suspension and have even driven with 4 adults in the car on this setup. No rub. My issue however is the cup 2s aren't suitable for the street it seems. Zero grip in 1st, hardly any in 2nd, slip 3rd on cold days even (Only running a dinan stage 1, stock 295 pss hooked way better). So I've been doing research to see if the 335 PSS would be possible, hard to justify spending $900 on a set of tires I don't know will fit. Photos below of my setup.
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      12-31-2020, 02:49 PM   #21
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Quote:
Originally Posted by F13_Tyler View Post
Very interesting thread! In fact I'm looking to run a 335/30/20 Michelin PSS as well. brad850csi, I actually took inspiration from a post you made a while back when you had your ferradas put on. In fact, I went with the exact same model and color of Ferrada, same front spec as you, however I did opt for the 20x12 et25. Running the same 325/30/20 sport cup 2 (mine are the Mercedes spec, not sure what you're on. Difference is the Merc spec tires are .2" wider tread overall). Fit perfectly, zero rubbing on stock suspension and have even driven with 4 adults in the car on this setup. No rub. My issue however is the cup 2s aren't suitable for the street it seems. Zero grip in 1st, hardly any in 2nd, slip 3rd on cold days even (Only running a dinan stage 1, stock 295 pss hooked way better). So I've been doing research to see if the 335 PSS would be possible, hard to justify spending $900 on a set of tires I don't know will fit. Photos below of my setup.
That's great to hear I helped out! I'm just on normal Cup2 tyres, not manufacturer specific.

I run the Cup2 and Ferrada setup from November to April and agree that when they are cold they aren't that good but once they are warm they are absolutely brilliant.

I'm trying to decide if they have degraded a bit from when I last had them on the car as I feel they have less grip now than I remember from running them last summer/autumn. I kept them in my office which has 24/7 aircon that would have kept them between 19c and 22c for the entire period they were off the car so I don't think it is a temperature thing but maybe an aging thing. I have definitely burnt off a bit of tread trying to find grip

It is good to hear you can run 20x12" 25mm with 325 tyres, that would mean that a 335 would definitely be possible on my wheels....but I'd want to run a bit wider, either a 12" or a 12.5"

PSS is a bit older though compared to PS4S, I wonder if you'd be better served by 315/30r20 PS4S?
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      12-31-2020, 04:17 PM   #22
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Oh wow. I had no idea the 25mm offset was possible on 20x12. I got my wheels and I will get the 335s mounted to see how it is with the 25mm offset. I have 7mm spacer on order to replicate the ET18. For now, we know for sure 20x12 ET25 on 325 is possible on stock suspension. My test will be for same wheel specs on 335 and lowered on H&R.
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