Lets talk tire pressure...again. - Mercedes-Benz Forum
 
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post #1 of 10 (permalink) Old 02-14-2019, 04:07 AM Thread Starter
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Lets talk tire pressure...again.

I just changed the tires on the 350 and i swear to you the recommended pressures are too low as lI'm getting excessive wear on the outside. These are the 2nd set of tires i have run through and i remember having the same issue last time. I run 32 in the front and 36 in the back year round except winter when i add 2 extra psi to combat the low tire pressure warnings i get on those cold winter mornings. I religiously rotate every 10k miles when i the oil change. The excessive wear is both on the inside and outside of the tire.

I guess the issue is the tire pressure of the front tires. But at a $1k a pop i dont want to waste the thread life of another set of tires experimenting. Does anyone know what a good PSI for proper inflation and good even contact across the surface of the tire? I'm running 255/55R19 Conti CrossContact LX20.
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post #2 of 10 (permalink) Old 02-14-2019, 04:09 AM
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I run 36 front 39 rear and don't have any issues.

"Semper In excretio, solum profundum variat" - unknown
They called me mad, and I called them mad, and damn them, they outvoted me" - Nathaniel Lee
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post #3 of 10 (permalink) Old 02-17-2019, 04:00 PM Thread Starter
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I run 36 front 39 rear and don't have any issues.
That's not too bad. Which tires are you rolling on and how long have you been rolling at this PSI?

Currently i have my fronts at 38 and rears at 40. Ruff ride in the rear but i'd rather have too much than too little. Plus i dont think its even possible for these wide tires to suffer from overinflation wear in the middle.

So perhaps the right tire pressure is whatever is above wear on the outsides (underinflation) and but below unacceptable ride comfort.
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post #4 of 10 (permalink) Old 02-17-2019, 06:58 PM
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Pirelli Scorpion Stradas. Got them from Discount Tire. Can't remember how much but warrantied for 60k miles.

And I do a LOT of miles. Maybe 60k a year.

"Semper In excretio, solum profundum variat" - unknown
They called me mad, and I called them mad, and damn them, they outvoted me" - Nathaniel Lee
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post #5 of 10 (permalink) Old 02-26-2019, 10:59 AM
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@ODIUS,

I don't think it's the pressure. I had the exact same set of tires on my R350 for about 5 years (40k miles), with 36/39 F/R psi, and mine also worn out the outer treads first, though not as significantly different as yours. I attributed the wear pattern to my wife's driving style - turning the wheels when not moving. I've got Pirelli Scorpion Verde now and at least this tire doesn't seem to show the same wear pattern.
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post #6 of 10 (permalink) Old 02-27-2019, 07:21 PM
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If you believe the internet, according to https://www.knowyourparts.com/techni...ing-tire-wear/ this website, your tires are actually under inflated if they are wearing like that.
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post #7 of 10 (permalink) Old 03-10-2019, 07:39 PM Thread Starter
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Perhaps this issue plagues the Conti CrossContacts and not other tires of the same size. But I actually noticed too that wide tires on my truck exhibit this outside wearing when the PSI is anywhere in the 30s. So i have made up my mind that i will inflate all my tires to 40+ PSI and deal with the harsher ride and increased road noise. If that can help me squeeze many life out of these tires then its a tradeoff i can live with. Or rather....a tradeoff the Mrs will have to live with as its now her daily driver.
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post #8 of 10 (permalink) Old 03-10-2019, 10:55 PM
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Perhaps a narrower tire of the same height that better handles lower pressure, or even something a bit taller so the sidewall at the same width with the taller sidewall could absorb the bumps better at higher pressure.

https://tiresize.com/chart/
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post #9 of 10 (permalink) Old 03-27-2019, 05:22 AM Thread Starter
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Perhaps a narrower tire of the same height that better handles lower pressure, or even something a bit taller so the sidewall at the same width with the taller sidewall could absorb the bumps better at higher pressure.

https://tiresize.com/chart/
That's actually not a bad idea...but how narrow could/should i go?
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post #10 of 10 (permalink) Old 03-27-2019, 09:09 AM
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First you have to find out if your 19" rims are the 8" or the 8.5" width.

Also, since your running 55's it looks like your tire size might already be slightly taller than what's oem

I would keep your tread width to something like 1"-1.5" wider than the rim width. Use the chart to calculate the difference between the OE tire height and what you are thinking to use.

Just remember that the taller you go, the more your speedo will be reading lower than your actual speed.
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