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Tyres not as owners manual - confused!

Discussion in 'Wheels, Tyres, Brakes & Suspension' started by Gaggsy, Dec 5, 2016.

  1. Gaggsy

    Gaggsy New Member

    Messages:
    7
    Joined:
    Nov 23, 2016
    Location:
    Hertfordshire, UK
    Car:
    E220BT(212)(F/L)SE 2015
    The 1 year old E Class 220 Bluetec SE (W212) that I bought 3 weeks ago has 17" wheels. The owner's manual says they should have 245/45 R17 95W tyres all round.

    However, the tyres on the car are 225/50 R17. Is this different size a problem? Does this mean they are non-standard rims? Or can both size tyres fit on the same size rim?

    Incidently, I can't see this size tyre (225/50) anywhere in the manual for any variant of the car - but it is listed on the sticker inside the petrol flap.

    Also, looking at the tyres, the rears are both speed rated 98Y (both Hankook), but the fronts are 94W (one Continental, one Nankang).

    I'm concerned about the mix between front and back, but more so between the two front tyres. Should I be?

    When I was buying the car the dealer said they don't let cars out with less than 4mm tread on the tyres so I suspect that's why there's a mix. However, the car had only 9,500 miles on it so I'm surprised the tyres have been changed at all.

    On the other hand, the tyre pressures were all around the 235 - 250 kpa mark whereas the petrol flap sticker said they should be 280 kpa. I wonder if the dealer actually checked them at all?

    Before I ask the dealer, what are your thoughts?

    Thanks in anticipation!
     
  2. st13phil

    st13phil Hardcore MB Enthusiast

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    According to the January 2016 edition of the E-Class price list, 17-inch 5-twin-spoke wheels with 225/50 tyres are standard on the E 220 BlueTEC SE Saloon and Estate, with 245/45 tyres on other models, so it looks like they're the right size for your car.
    The speed ratings (Y and W) are both higher than the top speed of the car so are also OK, and the load ratings (98 and 94) are also OK.

    While I (and many others) prefer not to mix tyre brand/model front to rear it's rarely an issue. What I would not do (and it is considered to be bad practice) is mix tyre brand/model on the same axle. Personally I'd ask them to either put a pair of matching tyres on the front.
     
  3. renault12ts

    renault12ts Hardcore MB Enthusiast

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    They're a bit narrower than what you say the standard fit should be...but the bigger profile number means they are about the correct diameter.

    Unless you are ragging it on a regular basis I wouldn't worry too much about the mix. But...next time you need new tyre you could put the new ones of the wider variety on the rear and eventually you will have what you want all round.
     
  4. OP
    OP
    Gaggsy

    Gaggsy New Member

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    Will they fit? Can 245 be a replacement for a 225 tyre?
     
  5. 400ixl

    400ixl Hardcore MB Enthusiast

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    The 245/45/17 will be slightly smaller diameter wise, but nothing to worry about.

    225/50/15 245/45/17
    Diameter 656.8mm 652.3mm
    Circumference 2063.4mm 2049.3mm
    Speedo error 0% 0.69%
    Reading at 30mph 30mph 30.21mph
    Reading at 60mph 60mph 60.41mph
     
  6. renault12ts

    renault12ts Hardcore MB Enthusiast

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    The tyre will be 1 cm closer to the suspension upright...so check the existing distance. And 1 cm closer to the arch...so check that too.
     
  7. Rory

    Rory Hardcore MB Enthusiast

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    I think on Bluetec cars the pressure is listed higher for economy reasons.
     
  8. st13phil

    st13phil Hardcore MB Enthusiast

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    ^ This.

    It's also the reason the E220 BlueTEC SE was supplied from the factory on 225/50 tyres rather than 245/45's: it improves fuel economy which means lower emissions which means cheaper VED. The manual makes mention that you can run lower tyre pressures to improve ride comfort if you wish, but that in doing so it will increase fuel consumption.

    The OP's car is on the size of tyre it was "meant" to be, i.e. 225/50. Assuming that the wheel size (both width and offset) is the same on the E220 BlueTEC SE as it is on other variants fitted with 17-inch wheels, then there will be no problem swapping to 245/45 tyres if that's what he wants to do, other than a marginal increase in fuel consumption.
     
  9. 190

    190 Hardcore MB Enthusiast

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    My C180K Blue Efficiency is the same with the tyre size reduced from 205/55 to 195/60 in order for it to scrape into a lower VED band. You wouldn't think 10 mm narrower would make much difference but apparently it reduces aerodynamic drag as as well as rolling resistance.

    I do run 5% lower pressures to improve the ride after finding some data which suggested a 5% reduction in pressure would only drop economy by 0.4%

    With a book pressure of 280 kPa (40 Psi) I had to convert it to something I understand, I would be wanting to reduce the pressure by 10% to 36 Psi.
     
  10. OP
    OP
    Gaggsy

    Gaggsy New Member

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    Hertfordshire, UK
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    E220BT(212)(F/L)SE 2015
    Thank you all so much for your replies. Exactly the sort of information I was looking for.

    What a wonderful resource this forum is!
     
  11. OP
    OP
    Gaggsy

    Gaggsy New Member

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    Hertfordshire, UK
    Car:
    E220BT(212)(F/L)SE 2015
    Following up my original post, I've since been to another MB indy service centre for a separate issue (faulty NOX sensor causing engine diagnosis warning lamp to come on) and back to my original dealer. I've now gleaned this information:

    * The original factory fitted tyres were 225/50/R17 with a W rating.
    * Original tyres were Continental MO.
    * The car had a puncture after about 750km and one front tyre was replaced with a Hankook.
    * The rear tyres were replaced with Nankang Y rated tyres by the dealer before selling the car to me because the originals did have not have sufficient tread left on them.

    At he indy dealer I asked their opinion about the tyre mix. The guy I spoke to said it would all pass an MOT and was legal, the front tyre mix wouldn't concern him but he would prefer the same tyre on the axle. He thought the rear Nankangs were a budget tyre and in his view he would ask the dealer to put decent tyres on - after all I'd spent £22k on the car. (He also said "but don't say I said so!")

    Back at the original dealer, they were only concerned about the speed ratings. The Y's on the rear were OK because they exceeded the specified W's. They said the Nankangs were intermediate rather than budget tyres. Changing them to something more 'premium' was not offered.

    Ah well, the tyres will eventually resolve themselves when I replace them as they wear out. The car is running really nicely and I'm just going to relax and enjoy the drive!
     
    1 person likes this.
  12. Mickdavid

    Mickdavid New Member

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    i would not run at low pressure, i have hankook mo 225 50 r17 94w that have been run at a minimum of 2.75 bar, they have warn as if under inflated, with 4.5 mmm of tread left in the center 80% (probably another 20,oookM) Both Hankook and mercedes are 'surprised' by this. To me they are dangerous as breaking and water clearance will have been severly compromised by this contact pressure. I am now running a new set at 2.9 bar at the front and 3.1 at the rear. ( In France you can not have different tyres on the same axle)
     
  13. knight80

    knight80 Member

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    Feb 18, 2016
    Car:
    Mercedes E-220 blutec
    Hey the same care and same old , from mercedes I purchased . 225/50/17 comes as standard for bluetec SE MODELS in the uk. However you can use 245/45/17 where used on cdi non blutec from 2013 to 2014.
    If you look at the manual on E220 blutec blue efficiency version you will find 225/50/17 as well as 245/45/17
    They change the tyres for approved car if they think they are below their standards . Don't worry for that . Mine was changed when I bought it at 8071 miles
    In my opinion best pressure is 35 ps for 225/50/17

    Sent from my iPhone using Tapatalk
     
  14. Mr Filipov

    Mr Filipov Hardcore MB Enthusiast

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    Ha, it makes me laugh that it is ok for Mercedes to put budgets and call them mid range when it is them paying for it, but if it is your money they will try and ram the premium mo specs down your throat with all the quality and safety crap. Yes, in general the premium tyres are better than budgets, but the funny thing is how the sides change depending on who is splashing out.
     
  15. markjay

    markjay Hardcore MB Enthusiast

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    Same when you need suspension comments changed...

    Under warranty they will only change the affected side, but if you are a paying customer then you will be advised (rightly) that suspension components should be replaced in pairs.
     

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