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    Car fanatics...need tire advice

    Ok guys so I just got a "new" car in January and blessed with fun winter roads. It is a 2005 Mercedes c230k so it's rear wheel drive. Love the car so thinking of buying some winter tires for next year. And, being as I am a cheapash, I found some on craigslist that look like a good deal. They are slightly different size though (they are both 17's but different aspect ratio) Stock tire is 225/45R17. Winter tires are 205/45R17. From what I see new tires would cause the speedometer to read 2.8% too fast. So if the speedo says I'm going 60, I'm really only going 58.3 mph.

    Will this cause issues with the traction control?


    Also...thinking of just finding some "cheap" rims so I just swap them out myself. Do I need to find a specific 5 bolt pattern? Thoughts?

    Thanks guys tire noob here.

    Pic relevant...it's the car.

    Click image for larger version. 

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    Re: Car fanatics...need tire advice

    Quote Originally Posted by Boxerdaddy View Post
    Ok guys so I just got a "new" car in January and blessed with fun winter roads. It is a 2005 Mercedes c230k so it's rear wheel drive. Love the car so thinking of buying some winter tires for next year. And, being as I am a cheapash, I found some on craigslist that look like a good deal. They are slightly different size though (they are both 17's but different aspect ratio) Stock tire is 225/45R17. Winter tires are 205/45R17. From what I see new tires would cause the speedometer to read 2.8% too fast. So if the speedo says I'm going 60, I'm really only going 58.3 mph.

    Will this cause issues with the traction control?


    Also...thinking of just finding some "cheap" rims so I just swap them out myself. Do I need to find a specific 5 bolt pattern? Thoughts?

    Thanks guys tire noob here.

    Pic relevant...it's the car.

    Click image for larger version. 

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Views:	94 
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    The 225 and 205 refer to the width of your tread, not the side wall length. Therefore the new tire wouldn't fit on the rim... that is if you are using the same rim for both summer/winter tires.


    Last edited by MNCYWX; 03-27-2013 at 08:13 PM.
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    Re: Car fanatics...need tire advice

    Looks like a clean Benz.



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    Re: Car fanatics...need tire advice

    Quote Originally Posted by MNCYWX View Post
    The 225 and 205 refer to the width of your tire, not the side wall length. Therefore the new tire wouldn't fit on the rim... that is if you are using the same rim for both summer/winter tires.
    I think that's correct for measurements, but they still may fit the rims


    Last edited by ISU_phoria; 03-27-2013 at 08:11 PM.

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    Re: Car fanatics...need tire advice

    Quote Originally Posted by MNCYWX View Post
    The 225 and 205 refer to the width of your tire, not the side wall length. Therefore the new tire wouldn't fit on the rim... that is if you are using the same rim for both summer/winter tires.
    I'm pretty sure that is false. I know that the 225 and 205 are widths but they both have 45 as their percentage of width for the sidewall height...which means the circumference changes.....which means the speedometer is incorrect. I'm fairly certain a 225 and 205 width will both fit just fine on the rim.



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    Re: Car fanatics...need tire advice

    Let me clarify... that is the width of your tread, not sidewall.


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    Re: Car fanatics...need tire advice

    Quote Originally Posted by Boxerdaddy View Post
    I'm pretty sure that is false. I know that the 225 and 205 are widths but they both have 45 as their percentage of width for the sidewall height...which means the circumference changes.....which means the speedometer is incorrect. I'm fairly certain a 225 and 205 width will both fit just fine on the rim.
    I think the would fit as well. Many people put 265 or 285 tires on stock trucks wheels that come with 245 stock tires.



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    Re: Car fanatics...need tire advice

    Quote Originally Posted by MNCYWX View Post
    Let me clarify... that is the width of your tread, not sidewall.
    Right sorry I wasn't clear either...yes that is the tread width. You are correct on that. However, I think you are mistaken on the not fitting on the rim part.



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    Re: Car fanatics...need tire advice

    Wow... after digging around, clearly I'm mistaken. Carry on.


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    Re: Car fanatics...need tire advice

    Quote Originally Posted by MNCYWX View Post
    Wow... after digging around, clearly I'm mistaken. Carry on.
    Comes with the meteorology aspect.. jk :)


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    Re: Car fanatics...need tire advice

    Hey no worries. Makes us all learn!



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    Re: Car fanatics...need tire advice

    I have snow tires on my car that are a size too big. It does mess with my speed, but I think I am actually going faster than it says (I use my GPS to test).

    I haven't had any problems with them though.



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    Re: Car fanatics...need tire advice

    Don't know why I was thinking it but I was... Thought the width of tread had to match the rim. But there's a reason tires inflate.


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    Re: Car fanatics...need tire advice

    You may want to try out a GPS in it and see what speeds you see. German cars in general are usually off 5-10%. I forget what it is but there is some European law that makes them conservative with their speedometers. My VW GTI was always 8% off regardless of speed from the time it was new.


    This is from 2002

    The European regulation, ECE-R 39, is more concise, stating essentially that the speed indicated must never be lower than the true speed or higher by more than one-tenth of true speed plus four kilometers per hour (79.5 mph at a true 70). Never low. Not even if somebody swaps a big set of 285/35R-18s for stock 255/45R-16s.
    There's your explanation of high-reading European speedometers, with the highest readings on Porsches and BMWs that are most likely to lure owners inclined to fool with tire sizes. Of course, only the speedometer must conform. Trip computers are free to report average speed honestly. Try setting your BMW or Porsche cruise control and then resetting the average-speed function. Unless you've screwed up the tires, the trip computer should show a nearly accurate reading. Even General Motors, whose domestic speedometers are the best, must skew its readings slightly high on vehicles exported to Europe.



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    Re: Car fanatics...need tire advice

    I'm also looking at buying a set of used tires. Does the rim size always have to match, e.g., can I fit 265/65/17r tires on rims that originally had 265/65/15r?



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