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Sharing.............
I searched similar topic but I can't find any.
Anyway, I was doing some sound insulation at the trunk. So naturally I checked my spare tire pressure too.
I usually check my spare tire pressure at least twice a year and extra check before a long trip, example Bali.
So this is a total lost now.
Amazing. Never used, so never exposed to the sun or any heat from actual use yada yada and only 8 years life ?
The AMG Ronald wheel OE to my car, also uses all rubber stem tire valve. I have not check that, but early 2022 I took them OE wheel + new tire to the track for like 16 laps and they are fine.
For my BBS Wheel, I avoid any rubber stem based tire valve, because the exact fear I had of sudden total failure is what made me choose aluminum ones.
Aluminum ones compresses the o-ring, so slow leak can happen as worse case, but never it can fail as dangerous as rubber stem ones.
So you guys out there, please take a look closely at your spare tire valve and you main wheels one , if MB gave you the rubber stem ones.
How do you hide a full size spare tire Juan ?
Wont the trunk spare wheel floor cover can not be closed flat ?
It fits perfectly. In fact, I think the wheel floor cover is now sturdier since it is supported better than before. I guess that is a function of what "full size" means: mine has 245/40R18 tires all around
Ok, got my driver to go to tire shop. Me lazy to go for such simple task
Autopsy :
Valve rate of leak, excluding tire to rim super duper micro leak IF ANY.
01. My AMG OE, with the rubber body tire valve. 2-3ish PSI a month.
02. My BBS with ray's alu body valve. 1ish psi a month.
03. This spare tire : if one check it every 6 months, 18 - 20 psi lost seems normal, based on full rubber valve body and that is what I been seeing.
It fits perfectly. In fact, I think the wheel floor cover is now sturdier since it is supported better than before. I guess that is a function of what "full size" means: mine has 245/40R18 tires all around
Holy Moly, never expect spare wheel well to be that deep , thanks Juan
It is unfortunate the TPMS system does not work for 5 wheels. My spare has the sensor as well, and it would be great to see the current pressure while in the trunk. Manual check for now.
Usually when I used to have full sized spare wheel for other car, I pump as high as allowable by the brand. I carry tire pressure gauge in the car.
So when needed, I release some air. I am no more than 34-35 psi usually as standard need, so 40psi if about what I usually pump to full size spare tire.
I will bring my front AMG OE 8.5J x 18" if I go to Bali as spare, now that I learnt it can fit the spare wheel well
Albeit tire is not PS4, at least I still can speed decent compare to using super skinny scarry 80KM/H max wheel....unless I want to drift for fun...LOL.
My current BBS rear is 255 while front 245 all wheel/rim 8.5J
AMG OE one was 265/35 rear and its wheel/rim was 9J.
My Acura is getting new Continentals today. I show my spare in the trunk ho the clerk...
he says: this is a Mercedes, right ?
I ask: how do you know ?
He says: Mercs are the only cars that have bad spare stems.
Dang.... that is bad and good news. Bad that it is BAD, but GOOD that now we know probably 5-6 years is a good time to change the valve for me...my climate.
Thanks Cali
Dang.... that is bad and good news. Bad that it is BAD, but GOOD that now we know probably 5-6 years is a good time to change the valve for me...my climate.
Thanks Cali
You can either keep replacing these amazing stems -Or use your full size wheel like Juan is doing with TPMS...
Speaking on which last year, I took a mountain forest tour on a tourist coach around Yosemite National Park.
The driver kept on having Mercedes style computer problems: his 8 TPMS tires were giving him goofy values.
Also I found amazing he was using the KeyON/OFF/ON to reboot his coach !!
I said to myself, this must be good-old Bosch equipment nagging.
Last edited by CaliBenzDriver; 10-07-2022 at 03:31 AM.
Anything with low power radio like TMPS sender, in a moving car is challenging....the bigger the car/vehicle and if the receiver is only 1 unit ...hhhmmm.
My GoPro wifi interconnect is okey when engine OFF, but when engine ON and car moving, cuts off always. This is bumper cam I speak of.
Holy Moly, never expect spare wheel well to be that deep , thanks Juan
I am also shocked, and incredibly, I have a spare matching refinished rim. Guess what I'll be doing with it.
I will never get over how worthless all this "temp spare/run-flat" garbage is. Consumers should never have let the car manufacturers get away with this cost-cutting measure. The automakers should have found other ways to save a negligible amount of weight.
What do you do with a flat in the middle of the night on the Interstate (our superhighways) in winter?
I also get rid donut spare tire when I switch from 18" to 17". I got replica wheel $150 and tire only $80 so it super cheap but perform as well as $240 Michelin. So I might as well buy the 5th for spare and it fit perfectly well.
I also get rid donut spare tire when I switch from 18" to 17". I got replica wheel $150 and tire only $80 so it super cheap but perform as well as $240 Michelin. So I might as well buy the 5th for spare and it fit perfectly well.
Mind sharing the tire's model and brand?
Outperforming Michelins on ride quality, noise, grip and reliability above 90+MPH for 1+hour is not an easy feat.. I have Continental, so not a Michelin fan boy by any means
My spare tire air valve blew out the last time I used it, thankfully it was in my driveway when it went. I recommend W212 owners get it replaced proactively.
10-05-2022, 10:19 AM
, thanks Juan
