Do I have the correct tire psi in my tires??
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2012 Mercedes C63 AMG S
Do I have the correct tire psi in my tires??
My C63's tire psi lable on the driver's door post clearly shows that the tire psi should be 46 psi front and 49 psi rear:
But, I keep reading about guys on this forum running 38 psi or thereabouts.
I do have the 19 inch wheels and P31 package.
Have other owners with the MB 19" wheels found that the 46F / 49R is somehow not the best?
The difference here between the 46F / 49R and what I am reading on the forum seems pretty big.
Jim G
But, I keep reading about guys on this forum running 38 psi or thereabouts.
I do have the 19 inch wheels and P31 package.
Have other owners with the MB 19" wheels found that the 46F / 49R is somehow not the best?
The difference here between the 46F / 49R and what I am reading on the forum seems pretty big.
Jim G
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From: Kitchener, ON
2010 C63 AMG
Door panel ratings are for GVWR using the OEM tire load spec. The inside of your fuel door will show 2 examples with a passenger count.
This all changes with your tire load rating though.
EDIT: Fuel door sticker example
This all changes with your tire load rating though.
EDIT: Fuel door sticker example
Last edited by Jasonoff; Apr 24, 2017 at 09:43 PM.
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From: The Great White North
W204 C63 Coupe, W166 ML350 BlueTEC, 928GT, Taycan GTS Sport Turismo, C5 Z06 & IS300 race cars
^ This. Assuming that you're using OEM wheels / tire sizes, use pressures as indicated on the fuel door label.
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2012 Mercedes C63 AMG S
Ok, here is the tire psi label on my fuel door:
My car has the 19" wheels from the factory.
Notice that it calls for 44 psi Front / 42 psi Rear at moderate loading.
Notice that it calls for 46 psi Front / 49 psi Rear at maximum loading.
Notice that heavier loading barely affects the front tire psi, but maximum loading necessitates 7 psi more than moderate loading.
The maximum psi is required not only for maximum loading, but also when driving at high speed.
So, an owner with the factory 19" wheels, who either frequently carries passengers or trunk cargo, or who drives at high speed, needs to keep the rear tire psi at 49 psi unless he/she is willing to adjust the tire psi each time.
But, if he/she runs the higher rear psi all the time, including when alone in the car, can we expect the following outcomes:
- More wear along the centerline of the rear tires versus along the tread edges?
- Less traction, and earlier intervention of traction control, under high throttle situations?
- How big a deal would each of these be in typical everyday usage?
Jim G
My car has the 19" wheels from the factory.
Notice that it calls for 44 psi Front / 42 psi Rear at moderate loading.
Notice that it calls for 46 psi Front / 49 psi Rear at maximum loading.
Notice that heavier loading barely affects the front tire psi, but maximum loading necessitates 7 psi more than moderate loading.
The maximum psi is required not only for maximum loading, but also when driving at high speed.
So, an owner with the factory 19" wheels, who either frequently carries passengers or trunk cargo, or who drives at high speed, needs to keep the rear tire psi at 49 psi unless he/she is willing to adjust the tire psi each time.
But, if he/she runs the higher rear psi all the time, including when alone in the car, can we expect the following outcomes:
- More wear along the centerline of the rear tires versus along the tread edges?
- Less traction, and earlier intervention of traction control, under high throttle situations?
- How big a deal would each of these be in typical everyday usage?
Jim G
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From: The Great White North
W204 C63 Coupe, W166 ML350 BlueTEC, 928GT, Taycan GTS Sport Turismo, C5 Z06 & IS300 race cars
Hi Jim,
Unless you intend to go driving on the autobahn in Germany with four passengers and a full trunk, what I would suggest you do is put 45 psi COLD in all four corners and enjoy the ride. At least that's what I do on mine. Oh - and at 45 psi cold, the tire wear is perfectly even.
Unless you intend to go driving on the autobahn in Germany with four passengers and a full trunk, what I would suggest you do is put 45 psi COLD in all four corners and enjoy the ride. At least that's what I do on mine. Oh - and at 45 psi cold, the tire wear is perfectly even.
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2014 C63 Sedan, Toyota Tacoma Supercharged, Lexus RX 350
IMO, with as much as -2.5 degrees of camber in the rear there is no way for even tire wear regardless of psi
Last edited by MB_SD; Apr 25, 2017 at 03:23 PM. Reason: spelling
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From: South Florida
'12 C63 Coupe
I have been running 38F/35R on 18" Conti DWS 235/255
Previous owner must have had the car repainted, and they did not put back the tire psi labels. Missing from both spots; the door jam and gas panel.
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2009 c63
I have been running 38-39 on all corners for years on 18" PSSs... I found higher pressures just created more wear in the center of the thread... this is my daily driver, no track time...
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Thread Starter
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Joined: Apr 2017
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2012 Mercedes C63 AMG S
Hi Jim,
Unless you intend to go driving on the autobahn in Germany with four passengers and a full trunk, what I would suggest you do is put 45 psi COLD in all four corners and enjoy the ride. At least that's what I do on mine. Oh - and at 45 psi cold, the tire wear is perfectly even.
Unless you intend to go driving on the autobahn in Germany with four passengers and a full trunk, what I would suggest you do is put 45 psi COLD in all four corners and enjoy the ride. At least that's what I do on mine. Oh - and at 45 psi cold, the tire wear is perfectly even.
BY the way, I am running Nitrogen in the tires (to reduce psi loss over time), as I have learned via both cars and motorcycles that the pressure loss, and also pressure variance with changing temperatures, is notably reduced.
I still cannot get over 46 psi and the super low tire profile. The high pressure, low profile (which means less overall tire carcass to absorb hits and heat), the stretched load rating, and relatively narrow tires, coupled with a high torque and high rpm engine, and the high toe-in prescribed by MB, must surely be the reasons for the really short tire life all the tire threads mention.
Jim G
Last edited by JimGnitecki; Apr 25, 2017 at 04:18 PM.
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From: Sidney, BC
2009 SLK55 AMG. & 2022 GLA250 4Matic
Ok, here is the tire psi label on my fuel door:
My car has the 19" wheels from the factory.
Notice that it calls for 44 psi Front / 42 psi Rear at moderate loading.
Notice that it calls for 46 psi Front / 49 psi Rear at maximum loading.
Notice that heavier loading barely affects the front tire psi, but maximum loading necessitates 7 psi more than moderate loading.
The maximum psi is required not only for maximum loading, but also when driving at high speed.
So, an owner with the factory 19" wheels, who either frequently carries passengers or trunk cargo, or who drives at high speed, needs to keep the rear tire psi at 49 psi unless he/she is willing to adjust the tire psi each time.
But, if he/she runs the higher rear psi all the time, including when alone in the car, can we expect the following outcomes:
- More wear along the centerline of the rear tires versus along the tread edges?
- Less traction, and earlier intervention of traction control, under high throttle situations?
- How big a deal would each of these be in typical everyday usage?
Jim G
My car has the 19" wheels from the factory.
Notice that it calls for 44 psi Front / 42 psi Rear at moderate loading.
Notice that it calls for 46 psi Front / 49 psi Rear at maximum loading.
Notice that heavier loading barely affects the front tire psi, but maximum loading necessitates 7 psi more than moderate loading.
The maximum psi is required not only for maximum loading, but also when driving at high speed.
So, an owner with the factory 19" wheels, who either frequently carries passengers or trunk cargo, or who drives at high speed, needs to keep the rear tire psi at 49 psi unless he/she is willing to adjust the tire psi each time.
But, if he/she runs the higher rear psi all the time, including when alone in the car, can we expect the following outcomes:
- More wear along the centerline of the rear tires versus along the tread edges?
- Less traction, and earlier intervention of traction control, under high throttle situations?
- How big a deal would each of these be in typical everyday usage?
Jim G
You need to worry about alignment more than tire pressures if you are worried about tire wear.
It is a basic known fact in any car what the consequences are of under inflated and over inflated tires.
On all of my 11 MB cars I have followed to fuel door or manual pressures and the only worry I had on my W124s without LSD was I tended to wear out the RR faster than the others.
If GAIN offers you an opportunity to take your car to the VIMP they will require you to run 4psi higher than the base pressures.
Last edited by Alex.currie44; Apr 26, 2017 at 12:41 PM.
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From: The Great White North
W204 C63 Coupe, W166 ML350 BlueTEC, 928GT, Taycan GTS Sport Turismo, C5 Z06 & IS300 race cars
Sick AF and Dogtag114 - the 18" wheels call for lower pressures than the 19" as you have more sidewall. With 18" summers you should be running 40 psi F and maybe 42 psi R.
MB SD - I am not sure what the factory rear camber spec calls for on the C63, but both my winters, summers and track tires are wearing out evenly across the tire tread surface. Do you have any suspension mods?
MB SD - I am not sure what the factory rear camber spec calls for on the C63, but both my winters, summers and track tires are wearing out evenly across the tire tread surface. Do you have any suspension mods?
MBWorld Fanatic!
Joined: Apr 2013
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From: Sidney, BC
2009 SLK55 AMG. & 2022 GLA250 4Matic
Sick AF and Dogtag114 - the 18" wheels call for lower pressures than the 19" as you have more sidewall. With 18" summers you should be running 40 psi F and maybe 42 psi R.
MB SD - I am not sure what the factory rear camber spec calls for on the C63, but both my winters, summers and track tires are wearing out evenly across the tire tread surface. Do you have any suspension mods?
MB SD - I am not sure what the factory rear camber spec calls for on the C63, but both my winters, summers and track tires are wearing out evenly across the tire tread surface. Do you have any suspension mods?
Camber Front Cross Camber Front
-1.39 to -2.11 -0.40 to 0.40
Caster
Looks like 11 degrees Cross Caster -0.50 to 0.50
Toe Front
0.10 to 0.27 Total Toe 0.20 to 0.54
Camber Rear
-1.48 to -2.48
Toe Rear 0.01 to 0.25 Total Toe 0.14 0.38
Thrust Angle -.012 to 0.12
FYI
Last edited by Alex.currie44; Apr 26, 2017 at 12:40 PM.
Thread Starter
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Joined: Apr 2017
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2012 Mercedes C63 AMG S
I have the 19" wheels remember, not 18", and the door pillar tag suggests 46 psi front and 49 psi rear, but as others pointed out above, that is really only needed when the car is carrying "maximum load". The fuel filler door tag suggests psi as low as 41.
After adjusting my tire psi, in all 4 tires to 46 psi, and running that way for a couple of days, I realized that the ride is not dramatically, but notably, softened from the 46 front / 49 rear I had been running. The difference is enough that I no longer "notice" the sharper pavement bumps like I did befor.
Thanks to all who chimed in on this thread.
Jim G
After adjusting my tire psi, in all 4 tires to 46 psi, and running that way for a couple of days, I realized that the ride is not dramatically, but notably, softened from the 46 front / 49 rear I had been running. The difference is enough that I no longer "notice" the sharper pavement bumps like I did befor.
Thanks to all who chimed in on this thread.
Jim G
MBWorld Fanatic!
Joined: Apr 2013
Posts: 1,506
Likes: 66
From: Sidney, BC
2009 SLK55 AMG. & 2022 GLA250 4Matic
I have the 19" wheels remember, not 18", and the door pillar tag suggests 46 psi front and 49 psi rear, but as others pointed out above, that is really only needed when the car is carrying "maximum load". The fuel filler door tag suggests psi as low as 41.
After adjusting my tire psi, in all 4 tires to 46 psi, and running that way for a couple of days, I realized that the ride is not dramatically, but notably, softened from the 46 front / 49 rear I had been running. The difference is enough that I no longer "notice" the sharper pavement bumps like I did befor.
Thanks to all who chimed in on this thread
Jim G
After adjusting my tire psi, in all 4 tires to 46 psi, and running that way for a couple of days, I realized that the ride is not dramatically, but notably, softened from the 46 front / 49 rear I had been running. The difference is enough that I no longer "notice" the sharper pavement bumps like I did befor.
Thanks to all who chimed in on this thread
Jim G
The 45 F and 44 R on the gas filler is 3 people and luggage. The assumption is that with the weight of the 156 engine a bit more pressure in the front is a good thing.
At 5 people and luggage you go to the higher pressure.
At 46 on all corners and since you like detail take some random depth measurements inside outside and center on your tires front and rear and see after a month or two at 46 psi what the changes are. I don't expect much but if I was to look for something I would look at centre wear in the rears.
In this car my ride on my 18 winters was noticebly softer at the same pressures. Wall height counts.
