Hi, can anyone help me determine the recommended normal load tire pressure for a 2010 c350 4matic with 18inch rims?
All my car says is MAX, 35 front, 38 rear...but that feels high to me and it is "max".

If anyone has a 2008-2010 c350 4matic (w/ 18inch rims), could you let me know what you are running at? Also, does the sticker on your door pannel give you a recommended tire pressure for "normal load"?

Much appreciated!

 

It will tell you the correct tire pressure on the sidewall of the tire. Every brand is different and the door panel sticker or VIN is only for the tires that come on it from the factory. Hope this helps!

 

While I don't want to start a debate on tire pressures the correct pressure for the tire should be listed on the door frame. Most tire sizes are listed because MB knows different rim and tire combinations are capable of being put on the car.
The tire pressure listed on the tire sidewall is the MAXimum pressure that the tire will endure when the car is fully loaded to its max. Tires inflated to the MAX will wear out very fast, produce prodigious amounts of heat and produce an extremely rough ride.
For example, the Goodyear Eagles on my BMW have a sidewall MAX pressure of 51psi but the door jamb for the car says 32psi front and 36 rear.
Similar Michelins are inflated to 26psi front and 32psi rear on my MB while the MAX is much higher.
Are you positive the tire size is not on the drivers door frame? If the exact size isn't there I would pick the tire size that is closest to yours.
For further info, go to www.tirerack.com and type "pressure" into their search engine.

 

gilgorm is right on creating more wear by putting your tire to the max psi. My hobbie of drag racing my Mustangs has always leed me to keep my pressure lower than specified on the tire being used (ecspecially the rear) for better traction due to more tire surface area contact to the road/track...for straight line racing anyway. It does make your car loose in turns due to softening the sidewall though. Tire Rack or the manufacturer of your tires would be a good source too. I typically keep my 18" wheels about 2-3lbs less than what the max states on my C240.

 

I have been busy with tire-pressure since 2007.
Got hold of a copy with formula the car manufacturers use to determine the advice-pressures on the stikker of the car, and learned myself Excell, to make spreadsheets for tire-pressure.
Found a way to calculate the weights back that where used for the normal-use- advice-pressures and introduced myself the load-factor.
Last spreadsheet is one to recalculate advice-pressures for non OEM tires.
Translated it to Englisch (from Dutch so sorry for mis-spellings and wrong terms)
http://cid-a526e0eee092e6dc.skydrive...0tyre-pressure
in this map always take the newest version and there are examples placed too.

Mayby you can have use for my spreadsheet, and if there are Questions, for instance about load-factor or camber-angle , ask me.

Needed from the car.
1. Maximum axle-loads front and behind.
2. maximum speed of the car
3. the advice pressures on the stikker wich belong to the individual car.

4. when above 2 degrees the camber-angle

Needed from the tires: example 195/65 R 15 XL 95 T
1. Maximum load of the tires ( KG, LBS, or Load-index, in example 95)
2. reference pressure or kind of tire. ( not the maximum pressure, in example XL stands for Extra load and has reference pressure of 2.9 bar)
3. Maximum permissable speed of the tire.( in example T stands for max 190km/h)