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Discussion Starter · #1 ·
Hi
I just had my SLK serviced and they have advised that i replace the rear tyres.
These are 245/35r18 and i would like some advice if these are run flat or not.
As always your help is appreciated.
Thanks
 

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Founding Member 2006
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108,893 Posts
I would think that would be annotated on the tire
Or you datacard might indicate if that was an option
 

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2008 SLK350
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The disadvantagesof runflats, are that they are more expensive and, at least over here, they are only allowed in combination with TPMS. Don't know how that is in the UK with the latter, but I suggest you should check. In my 30+ years of motoring I've had 3 times a flat, so personally I don't think it's worth the money. I'd take my changes with the spacesaver spare or a can of tirefit. And if that fails I call roadassistance.

Ahh, just read Jeff's remark If your question is whether the current ones are runflat or not follow his advice. Usually the come without them I think.
And in addition to what Jeff said, look for the symbols ROF (Run On Flat) or RSC (Runflat system Component) Or brandspecific ZP (Zero pressure) for Michelin, SSR (Self Supporting Runflat) for Continental and RFT for Bridgestone.
 

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Discussion Starter · #4 ·
Thanks guys.
At the minute i have Pirelli PZero tyres. I do have tyre pressure loss system. I cant see any symbol or writing on the tyre to indicate run flat. I looked at the Pirelli and the PZero is available as standard or Run flat as an option.
 

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Registered 2006 SLK280
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Run-flat tires are known to contribute to a harsher ride than ordinary tires; the extra-stiff sidewalls required to run while flat are the reason. Many owners and tuners will replace run-flats with ordinary tires for comfort and more predictable handling at the limits of adhesion. As Pete has noted, tires these days are so good that flats are very rare indeed. The SLK does come with a compact single-use spare wheel in the trunk (boot), with an pump to inflate it. That would get you to a place where the regular tire can be replaced. Replacing the single-use spare is an adventure in itself. Even if the car originally had run-flats, which I doubt, I would toss them in favor of ordinary tires.
 

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Founding Member 2006
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did u get your free datacard?
 

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2008 SLK350
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I do have tyre pressure loss system.
Be aware that TPMS (Tyre Pressure Monitoring System) is something else than a tyre pressure loss sytem.. Almost every car has the latter, it uses the ESP system to compare the rotation speed of the wheels. If 1 tyre goes flat it will spin faster, the system detects it and gives you a warning. TPMS actually measures the tyre pressure with a sensor inside the tyre and transmits this to the system in your car. You can actually see the pressure of each individual tyre. Check your datacard. The pressure loss system is option code 477, TPMS 470 or 475.
 

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My only experience of driving on run-flat tyres was on a BMW and I thought the ride quality was dreadful. The car would tram track too. Just horrible.
 

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Registered 2005 SLK350
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I went 255/35/R18 on the rear of mine.. bit more rubber made a noticeable ride comfort difference to the sports suspension (well did in my mind......) and filled the arches a bit better..


as standard the standard overall tyre diameters are 637mm front, 629mm rear... looked wrong to me.....


with 255's now a more even looking 637mm front, 636mm rear......


oh and I agree with all that's been said, runflat tyres are hateful, horrible things...... thankfully the kind MB designer chaps gave us a spare (sort of..)
 
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