gsrjc

What are people running? I have Pirelli Scorpion Ice & Snow in 235/60R17. Going to put the snow tires on this weekend as we got a little dusting of snow today.

@1958

Same tire on mine with the Elbrus 102 Rims. Minus 15C here in Alberta Canada, lots of snow on the major highways and the tires/GLK are performing perfectly...

Peter_02AMG

Air pressure is the same regardless of the size of the tire. Use what ever factory recommanded pressure...34 psi I think.

NYCGLK

Pretty sure that's not true.

MBRedux

I live in Maryland as well. The dusting we had dried up in less than 1 hour. The roads aren't even wet anymore. If I were you, I would wait before installing them. They wear real fast on dry roads, waste gas, have horrible dry grip and make way too much noise if there isn't any of the white stuff.

Since my snow's are here ready to go when needed, I usually wait until I hear that a storm is actually on its way before I'll go through the hassle of putting them on.

But as far as the tire pressure goes, that's a little tricky because of the way this miniSUV is set up. I would either check with the outfit that sold you the tires, call Pirelli directly or the dealership for guidance for that size SNOW tire. (I would call all three and cross reference the data.) You should mention the tire size, that they are indeed snow tires which will be installed in all 4 corners. It does make a difference.

Then please let us know what you find. Good luck.

GLKKa2H

Note that tire pressure is reduced by 1.7 PSI for every drop of 50°F (10°C) in temperature, so remember to compensate for tire - and ambient temperatures when checking/correcting tire inflation pressure.

NYCGLK

In US/Canada we only have 19 and 20 inch tires that car comes with; so info for 17 inch tires is not stated, please share if you have the info. And it's not on B pillar it's on the gas tank cap over here.

GLKKa2H

Weird, that calls for an amendment of the MBUSA online 2010 - and 2011 GLK Operator's Manuals.

The pressures recorded, cold tires, on our GLK are as follows:
(235/60)R17 (and R19) tires, three occupants: 2,5 Bar (36 psi) front/rear.
Five occupants and maximum permissible vehicle load: 2,5 Bar (36 psi) / 2,9 Bar (42psi) front/rear.

NYCGLK

Thanks for the info.

I think it's actually updated manual, so for some GLK's it might be the case. Earlier batches have it on the inside of the gas tank door.

My manual that came with the car is slightly different from the online manual, as some options and replacements were added to 2010 model later on.

KenNinBC

Um ... 5 Celsius degrees equals 9 Farenheit, so 10 C is 18 F.

Kn.

GLKKa2H

Thanks for the correction provided as needed . I guess I stumbled on a temperature of 10°C being 50°F.

cfab011

This might be a silly question as this is my first Mercedes, and I just picked up a set of Michelin Alpins winter tires on 17" MB rims... But what hoops do you have to jump through to switch the wheels? Are there special lug wrenches that you need or is it something you should have done at your dealership?

Any advice is greatly appreciated. Apologies ahead of time for being a noob!

NYCGLK

No hoops. Def no dealer necessary unless they do it for you for free or minimal charge. You can go to any tire shop and ask to swap the wheels. Many do it for free or minimal charge. In the summer I rotate my own tires, but in winter might as well has shop do it in 5 min.

gsrjc

No hoops at all... Just jack up the car and put on the snow tires and change the lugnuts if the snow tires came with new ones. Also, i always write on the summer tires the location of the tire so that when i reinstall them i know to rotate them if possible. if the rear tires are larger, then obviously that can't happen.

NYCGLK

One thing to note is not to over tighten the lug nuts. Some use wrench that measures force. If you over tighten them it will be very difficult to unscrew them later, but more importantly they can snap. I've even used such wrench, just put good amount of force but not as hard as possible. Also If you end up doing yourself:
1) start unscrewing them while car is on the grown, just first quarter-turn, so you are not putting lots of force on the car that is in the air, just a safety thing. The same thing when tighten them again.

2) when you tighten the lugnuts do it in a star pattern for even tightening. i.e. next lugnut should be across and not next to the one you just worked on. And do it several times so you tighten them evenly.

cfab011

Awesome, thanks for the info!

MBRedux

Use a torque wrench, set at 85-95ft.lbs.

GLKKa2H

Tightening torque as specified by MB is 96 lb-ft. Note the warning in the 2008 C-class Operator's Manual: http://www.mbusa.com/vcm/MB/DigitalA...350sport_1.pdf

"Wheels could become loose if not tightened with a torque of 96 lb-ft (130 Nm)."

cfab011

96 it is. Thanks!

CJBROWN

For regular street running the specified psi would be correct.
If you're really treking through snow and won't see speeds over 30 or 40 I would run 20-25. Same for sand and offroad. On jeeps they run 12-15 and 8 for rock crawling. But then they have rim locks and a way to air backup for on-road. Low 20's is enough pressure to keep from spinning the bead as long as you keep your foot out of it. Traction is vastly improved.

The rec psi is for highway speeds and max load carrying.

I am surprised and impressed that they actually considered the car for off-pavement driving in it's design process. Even though its a car. Driver skill required.

cfab011

So, I picked up some snows and rims the other day and want to see if I got as good of a deal as I think I might have. Got a set of Michelin Alpin Pilot's on Mercedes 17" rims (tires have 200 miles on them) with FREE SHIPPING for $1,050. The pictures show that everything is in quite good condition... That's a pretty fair price right?

http://http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?VISuperSize&item=270681027631

That's a link to the pics of them. Let me know thoughts

gsrjc

Fair price.... my stuff new was 1300 shipped. Elbrus rims and Pirelli Ice and Snow in 17s.

cfab011

The Mercedes OEM factory rims are quite expensive though, no? I was under the impression those would run for about $500 a pop brand new.

koojo

I set my 17" snows at 35psi front and 37psi rear. Works like a champ.

gsrjc

Missed the fact that you got them on OEM factory rims... but then again are the rims used? If so, then they wouldn't be that expensive.