AMG GT: GT, GTS, GTC, GTR, GT-4 door (C192 / R192) 2024 - present: The GT/GT S is the second generation GT sports car developed entirely in-house by Mercedes-AMG.

GT/C192/R192: Tire size inconsistencies for AMG GT55 20" wheels

Thread Tools
 
Search this Thread
 
Rate Thread
 
Old Nov 9, 2024 | 11:09 AM
  #1  
LAZARU5's Avatar
Thread Starter
MBWorld Fanatic!
Shutterbug
Liked
Loved
Community Favorite
 
Joined: May 2005
Posts: 1,439
Likes: 540
From: Philadelphia, PA (USA)
2025 E53 Hybrid
Tire size inconsistencies for AMG GT55 20" wheels

While exploring the available A/S and Winter tires for the AMG GT55, I discovered a discrepancy between published tire sizes for the 20" wheels. Unfortunately, I believe Tirerack blindly copied the MB "typos" and listed the incorrect 20" tire sizes in its online catalog. I opened a chat session with Tirerack customer service where it was agreed that a 1" difference in the outer diameter between the 20" and 21" tires was very odd. Tirerack has not corrected the sizes and I suspect that is because they are relying upon the tires sizes published in the MBUSA specifications.

Hopefully, a forum member with the RTM - 20" AMG Aero Twin 10-Spoke wheels can confirm the correct tire sizes.

2025 AMG GT Order Guide
2025 AMG GT Order Guide


Tirerack screen capture.
Tirerack screen capture.

MBUSA 20
MBUSA 20" tire specs.



Last edited by LAZARU5; Nov 9, 2024 at 11:11 AM.
Reply
Old Nov 9, 2024 | 01:48 PM
  #2  
RJC's Avatar
RJC
MBWorld Fanatic!
 
Joined: Feb 2002
Posts: 6,061
Likes: 326
From: 2000 ft over the FL coast in a B-17
Various
^^^Good info
I too would like to learn what UHP AS tires will work
Reply
Old Nov 11, 2024 | 08:45 AM
  #3  
LAZARU5's Avatar
Thread Starter
MBWorld Fanatic!
Shutterbug
Liked
Loved
Community Favorite
 
Joined: May 2005
Posts: 1,439
Likes: 540
From: Philadelphia, PA (USA)
2025 E53 Hybrid
There are three choices for the 20" staggered 10.5"/11.0" AMG GT wheels - RTM, RVM, and RVN. The Order Guide shows 295/30-R20 and 305/30-R20 tires for the RTM wheels and 295/35-R20 and 305/35-R20 tires for the RVM and RVN wheels. All of the tire sizes shown in the Order Guide (including the 19" tires) have a nominal outer diameter of 28", except for the tire sizes for the RTM wheels which have a nominal diameter of 27". The chances of this being correct are near zero. I wonder how many tires will have to be returned to Tirerack before they correct the listing. Sadly, the incorrect 20" tire sizes (295/30-R20 & 305/30-R20) have attractive choices for A/S tires.



Reply
Old Nov 13, 2024 | 12:52 AM
  #4  
RJC's Avatar
RJC
MBWorld Fanatic!
 
Joined: Feb 2002
Posts: 6,061
Likes: 326
From: 2000 ft over the FL coast in a B-17
Various
Originally Posted by LAZARU5
There are three choices for the 20" staggered 10.5"/11.0" AMG GT wheels - RTM, RVM, and RVN. The Order Guide shows 295/30-R20 and 305/30-R20 tires for the RTM wheels and 295/35-R20 and 305/35-R20 tires for the RVM and RVN wheels. All of the tire sizes shown in the Order Guide (including the 19" tires) have a nominal outer diameter of 28", except for the tire sizes for the RTM wheels which have a nominal diameter of 27". The chances of this being correct are near zero. I wonder how many tires will have to be returned to Tirerack before they correct the listing. Sadly, the incorrect 20" tire sizes (295/30-R20 & 305/30-R20) have attractive choices for A/S tires.

Nothing AS for 21’s, or did I miss it?
Reply
Old Nov 13, 2024 | 08:22 AM
  #5  
LAZARU5's Avatar
Thread Starter
MBWorld Fanatic!
Shutterbug
Liked
Loved
Community Favorite
 
Joined: May 2005
Posts: 1,439
Likes: 540
From: Philadelphia, PA (USA)
2025 E53 Hybrid
Originally Posted by RJC
Nothing AS for 21’s, or did I miss it?
There are AS tires available in the 295/30-R21 and 305/30-R21 sizes. BUT, there does not seem to be any tires available as a staggered set in the required sizes. I believe both sizes can be mounted on 10.5" or 11.0" rims, but I am certain that the MB engineers would not approve.
Reply
Old Dec 4, 2024 | 03:44 PM
  #6  
philenan78's Avatar
Junior Member
 
Joined: Feb 2024
Posts: 67
Likes: 49
From: New York
2025 AMG GT55, 2023 AMG SL43, 2023 GLS 450
Originally Posted by LAZARU5
There are AS tires available in the 295/30-R21 and 305/30-R21 sizes. BUT, there does not seem to be any tires available as a staggered set in the required sizes. I believe both sizes can be mounted on 10.5" or 11.0" rims, but I am certain that the MB engineers would not approve.
Anybody had any luck finding compatible all-season or winter tires for the 21" wheels? Coming up short with the online tire dealers...
Reply
Old Dec 4, 2024 | 03:58 PM
  #7  
LAZARU5's Avatar
Thread Starter
MBWorld Fanatic!
Shutterbug
Liked
Loved
Community Favorite
 
Joined: May 2005
Posts: 1,439
Likes: 540
From: Philadelphia, PA (USA)
2025 E53 Hybrid
Originally Posted by philenan78
Anybody had any luck finding compatible all-season or winter tires for the 21" wheels? Coming up short with the online tire dealers...
There are 295/30-R21 AS and Winter Tires available. This size can be mounted on both 10.5" and 11" wide wheels. Not sure if MB would approve of using the slightly narrower tires on the rear, but it's a lot safer than trying to drive with the 305/30-R21 Summer tires.
Reply
Old Dec 19, 2024 | 01:03 PM
  #8  
philenan78's Avatar
Junior Member
 
Joined: Feb 2024
Posts: 67
Likes: 49
From: New York
2025 AMG GT55, 2023 AMG SL43, 2023 GLS 450
Originally Posted by philenan78
Anybody had any luck finding compatible all-season or winter tires for the 21" wheels? Coming up short with the online tire dealers...
I did a lot of research on this and spoke to my dealer as well. Bottom line is there are no all season tires that fit the front and rear 21" wheels (could just put the front size on the rears as another poster mentions, but I don't think I would do that). It's a shame but maybe over time a manufacturer will make them. However, winter tires are available: Michelin Pilot Alpin 5 https://www.michelinman.com/auto/tir...-pilot-alpin-5. They seem to be available at TireRack.com for both front and rear for the 21" wheels. The other option is to buy a second set of 20" rims fitted with winter or all-season tires (plenty of options available for that size). The rims seem to go for about $5k for a set. I personally just decided I won't drive it much this winter, but for next year I'll probably go with one of those two options.
Reply
MB World Stories

The Best of Mercedes & AMG

story-0

6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)

 Verdad Gallardo
story-1

Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun

 Verdad Gallardo
story-2

Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

 Verdad Gallardo
story-3

8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

 Verdad Gallardo
story-4

Flawlessly Restored Mercedes 190E Evo II Heads to Auction

 Verdad Gallardo
story-5

Electric Mercedes C-Class Unveiled: 11 Things You Need to Know

 Verdad Gallardo
story-6

Mercedes EQS Gets A Major Update: Everything You Need to Know

 Verdad Gallardo
story-7

5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve

 Verdad Gallardo
story-8

Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping

 Verdad Gallardo
story-9

10 Most Reliable Mercedes-Benz Models You Can Buy Used

 Verdad Gallardo
Old Jan 21, 2025 | 09:55 PM
  #9  
fixinbones's Avatar
Member
 
Joined: Oct 2009
Posts: 210
Likes: 7
From: NY
2016 AMG GTS, 2015 GLA45 AMG
Originally Posted by LAZARU5
There are 295/30-R21 AS and Winter Tires available. This size can be mounted on both 10.5" and 11" wide wheels. Not sure if MB would approve of using the slightly narrower tires on the rear, but it's a lot safer than trying to drive with the 305/30-R21 Summer tires.
I tried to put 295 tires on my previous gen AMG GT, and they were clearly too narrow for the rims and looked horrible. Only replace them with something different but I forget what
Reply
Old Feb 9, 2025 | 04:41 PM
  #10  
JSP321's Avatar
Member
5 Year Member
 
Joined: Sep 2016
Posts: 76
Likes: 12
From: San Antonio, TX
2024 AMG GT 55, 2024 BMW 760i
I have a 2024 AMG GT 55...with the RVM 20inch AMG multi-spoke wheels...they came with Hancock Ventus s1 evo z tires (295/35/20 front and 305/35/20 rear tires)
Reply
Old Feb 9, 2025 | 04:46 PM
  #11  
JSP321's Avatar
Member
5 Year Member
 
Joined: Sep 2016
Posts: 76
Likes: 12
From: San Antonio, TX
2024 AMG GT 55, 2024 BMW 760i
And...I noticed as well...TireRack/Discount Tire had the wrong tire sizes listed (30 profile instead of 35 with the 20 inch wheels).

I just swapped the Hankook's out for Michelin Pilot Sport All Season 4 (295/35/20 front, 305/35/20 rear)....they ride a little bit better (and should last a LOT longer)....
Reply
Old Feb 9, 2025 | 06:15 PM
  #12  
LAZARU5's Avatar
Thread Starter
MBWorld Fanatic!
Shutterbug
Liked
Loved
Community Favorite
 
Joined: May 2005
Posts: 1,439
Likes: 540
From: Philadelphia, PA (USA)
2025 E53 Hybrid
Originally Posted by Jparsons
And...I noticed as well...TireRack/Discount Tire had the wrong tire sizes listed (30 profile instead of 35 with the 20 inch wheels).

I just swapped the Hankook's out for Michelin Pilot Sport All Season 4 (295/35/20 front, 305/35/20 rear)....they ride a little bit better (and should last a LOT longer)....
I think Tirerack is getting the wrong tire sizes from the Order Guide or some other MB documentation. I reported this to TR months ago, but I think they are too stubborn to change it. Once they ship enough of the wrong tires and have to eat the return shipping cost they will probably fix the website listing.
Reply
Old Nov 7, 2025 | 07:37 AM
  #13  
njnjperson's Avatar
Newbie
 
Joined: Nov 2025
Posts: 1
Likes: 0
taycan
As of today, TireRack no longer has any wheels or wheel/tire packages listed for the GT 55 or 63. The selections are greyed out.
Reply

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 


You have already rated this thread Rating: Thread Rating: 0 votes,  average.


All times are GMT -4. The time now is 05:44 PM.

story-0
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)

Slideshow: Not every Mercedes design becomes timeless, some feel stuck in the era they came from.

By Verdad Gallardo | 2026-05-12 18:09:07


VIEW MORE
story-1
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun

Slideshow: Yes, Mercedes built manual cars, and some of them are far more interesting than you'd expect.

By Verdad Gallardo | 2026-05-02 12:36:58


VIEW MORE
story-2
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.

By Verdad Gallardo | 2026-04-29 11:19:28


VIEW MORE
story-3
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

Slideshow: Before curves took over, Mercedes mastered the art of the straight line, and some of those shapes still look right today.

By Verdad Gallardo | 2026-04-25 12:05:49


VIEW MORE
story-4
Flawlessly Restored Mercedes 190E Evo II Heads to Auction

Slideshow: The 190E Evolution II shows how a homologation necessity became a six-figure collector icon.

By Verdad Gallardo | 2026-04-22 17:53:47


VIEW MORE
story-5
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know

Slideshow: Mercedes is turning one of its core nameplates electric, and the details show just how serious this shift is.

By Verdad Gallardo | 2026-04-21 13:58:06


VIEW MORE
story-6
Mercedes EQS Gets A Major Update: Everything You Need to Know

Slideshow: Faster charging, longer range, and a controversial steer-by-wire system define the latest evolution of Mercedes-Benz EQS.

By Verdad Gallardo | 2026-04-15 10:35:34


VIEW MORE
story-7
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve

Slideshow: These overlooked Mercedes-Benz models never got the spotlight, but they quietly delivered more than most remember.

By Verdad Gallardo | 2026-04-13 19:35:45


VIEW MORE
story-8
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping

Slideshow: A well-used 1991 Mercedes-Benz 300D with more than one million miles is now looking for a new owner, and it still appears ready for more.

By Verdad Gallardo | 2026-04-10 10:05:15


VIEW MORE
story-9
10 Most Reliable Mercedes-Benz Models You Can Buy Used

Slideshow: From bulletproof sedans to surprisingly tough SUVs, these Mercedes models proved that the three-pointed star can go the distance.

By Verdad Gallardo | 2026-04-08 09:55:49


VIEW MORE