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Coupe 19" Largest Tire Size

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Old 11-01-2018, 05:42 PM
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C63 coupe
Coupe 19" Largest Tire Size

Hello All,

Hopefully someone can help.

After searching around on the forum I am still unsure what size I need. I have a 2017 coupe with the factory 19" front and rear (not 20" like apparently everyone else), 9" front and 10.5" rear. I would like the widest tires with the most sidewall to maintain ride quality and grip. With my eurocharge tune the back stock tires are all over the place. What tires are the largest I can fit without spacers and without lowering? I would like them as flush as possible with no poke. I will be buying the Michelin PS4S for sure.

Thanks in advance!
Old 11-01-2018, 06:39 PM
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Originally Posted by IdTamer
Hello All,

Hopefully someone can help.

After searching around on the forum I am still unsure what size I need. I have a 2017 coupe with the factory 19" front and rear (not 20" like apparently everyone else), 9" front and 10.5" rear. I would like the widest tires with the most sidewall to maintain ride quality and grip. With my eurocharge tune the back stock tires are all over the place. What tires are the largest I can fit without spacers and without lowering? I would like them as flush as possible with no poke. I will be buying the Michelin PS4S for sure.

Thanks in advance!
lol my back tires are all over the place stock let alone with a tune 😬

from what ive seen on this forum 305s are the widest anyones gone
Old 11-01-2018, 06:42 PM
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I was thinking 305 but not sure about 305/35/19 or 305/30/19

Thanks!
Old 11-01-2018, 06:48 PM
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Originally Posted by IdTamer
I was thinking 305 but not sure about 305/35/19 or 305/30/19

Thanks!
this is the info i found for my car. 305/30/20 in the back and possibly 275s in the front.
Old 11-01-2018, 06:53 PM
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Nobody seems to have 19 rears
Old 11-01-2018, 08:18 PM
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OP, I'm also in the process of buying michelin 4s for my coupe. From my research, it seems like 265/35 R19 and 295/30 R 19 is a safe bet. Although i've see 305s mentioned. Im personally just going with the 265F and 295 rear. I also am running all 19 inch wheels, all stock with no lowering.

Just curious, where will you be buying the tires from?
Old 11-12-2018, 10:22 AM
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Originally Posted by Rubpau
OP, I'm also in the process of buying michelin 4s for my coupe. From my research, it seems like 265/35 R19 and 295/30 R 19 is a safe bet. Although i've see 305s mentioned. Im personally just going with the 265F and 295 rear. I also am running all 19 inch wheels, all stock with no lowering.

Just curious, where will you be buying the tires from?
I bought mine from Discount TIre - they had them ready the next day and installed them fast.


So I figured out that my car came with the 770 package, as below:



I decided to go with the following setup:

Front:
Pilot Sport 4S
265 /35 R19 98Y XL BSW

Rear:
Pilot Sport 4S
305 /30 R19 102Y XL BSW

They fit perfectly, and they do not spin at all unless it is raining, even with the Eurocharge tune. Totally changes the ride! They were a little stiff at first, but once I lowered the PSI to factory specs they handled perfectly. Below are some pictures, no poke/rubbing/etc.

Before:






After:






Ride stiff as hell:



Much better



Last edited by IdTamer; 11-12-2018 at 10:24 AM.
Old 11-15-2018, 09:10 AM
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how does it feel? (if it's heavier steering with the increased width)? any pros and cons with the increased tire size besides extra grip? do you have a little bit variation with the speedometer? Looks Great! I might go with those two sizes instead that you have chosen. We got the same wheels and 19 inches all around.
Old 11-15-2018, 09:16 AM
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They feel great, no problems as far as I can see. I have not noticed any variation in the speedometer, except maybe the 0-60 is faster

Than again I have not really tried to measure any variation, it may be off by 1-2 MPH. Tires are much grippier with lower PSI, but if you want it a little firmer you can always add more air.

Good luck!
Old 11-15-2018, 09:21 AM
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I'm glad to hear! im still debating to go with a 295 rear or the 305 rear that you went with, Im choosing 265 for the fronts...trying to figure out which is the better ratio lol
Old 09-17-2019, 10:21 PM
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19/20 setup for c63 non-s

How is the ride? Would you suggest going 19/20 for a c63 non-a coupe?

i have 18s all around Michelin PS4S
Old 02-26-2024, 11:11 PM
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Rubpau question

Originally Posted by Rubpau
OP, I'm also in the process of buying michelin 4s for my coupe. From my research, it seems like 265/35 R19 and 295/30 R 19 is a safe bet. Although i've see 305s mentioned. Im personally just going with the 265F and 295 rear. I also am running all 19 inch wheels, all stock with no lowering.

Just curious, where will you be buying the tires from?
Did you end up installing 295s on the rear and 265s up front? Any rubbing issue?
Old 03-04-2024, 09:31 PM
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2019 c63s
Hi friend. 2019 c63s coupe here. Our coupes are different wheel well size than sedans, so be careful what you read (we can handle bigger than the sedan can). Max I can fit (literally, I tried to go slightly bigger) is:

- Front 265/35 19inch
- Rear 305/30 20inch

These do not scrape at all, even when driven hard. The tire guys were scared to put them on at first as they didn't think they'd fit, but they fit perfectly. And they completely fill the well when looking at the car from the outside. I have Pilot Super Sport 4s. I can take a picture for you if you need it, DM me. cc @DaveSummer @Rubpau

Last edited by BlackScholes; 03-04-2024 at 09:34 PM.
Old 03-05-2024, 03:04 AM
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265 were meant for our car's fronts and 295 for rears. The old brochures even had 265's



Last edited by Jimmy_c63s; 03-05-2024 at 03:28 AM.
Old 03-05-2024, 09:59 PM
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Originally Posted by BlackScholes
Hi friend. 2019 c63s coupe here. Our coupes are different wheel well size than sedans, so be careful what you read (we can handle bigger than the sedan can). Max I can fit (literally, I tried to go slightly bigger) is:

- Front 265/35 19inch
- Rear 305/30 20inch

These do not scrape at all, even when driven hard. The tire guys were scared to put them on at first as they didn't think they'd fit, but they fit perfectly. And they completely fill the well when looking at the car from the outside. I have Pilot Super Sport 4s. I can take a picture for you if you need it, DM me. cc @DaveSummer @Rubpau
That’s the same setup I ran on my ‘21 coupe. On my ‘23, I went with the same 305/30/20 rears and up a size on the fronts to 275/35/19. No rubbing or scraping whatsoever.



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Old 03-05-2024, 10:07 PM
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Originally Posted by RavenM6
That’s the same setup I ran on my ‘21 coupe. On my ‘23, I went with the same 305/30/20 rears and up a size on the fronts to 275/35/19. No rubbing or scraping whatsoever.
So perfect... the way it was meant to be. Why did they give us such skinny tires?
Old 03-07-2024, 09:12 PM
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Originally Posted by Jimmy_c63s
So perfect... the way it was meant to be. Why did they give us such skinny tires?
Thanks bro. No idea why they skimped on the tire sizes. At the very least they should’ve been fitted with 265 fronts / 295 rears.

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