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Thread: What Front Tyres?

  1. #1
    Site Supporter ProtoTipo's Avatar
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    What Front Tyres?

    Can someone remind me:

    For road tyres (rather than the 215 TBs) is it normally 205/50 x 15.
    Or some other size? It's the aspect ratio I can't remember.
    'Don't like the rolling diameter too small.

  2. #2
    SEC Member Guy Mayers's Avatar
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    Re: What Front Tyres?

    Yup - I've had 205*50*15 on the front and 225*50*15 on the back when the car was a Stradale but now it's Gp4 I went to 345*35*15 and 225*50*15s

    Guy

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    Free user turbonutter's Avatar
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    Re: What Front Tyres?

    I can agree with Guy on that one - I had 205-50-15's front & 225-50-15 on the rear when I had my last car..

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    Site Supporter ProtoTipo's Avatar
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    Re: What Front Tyres?

    Thanks chaps.

    Any more votes for 205 50 ?

    I don't know what the 215 TBs are for side wall ratio?, but that's the kind of side wall height/rolling diameter I prefer.

  5. #5
    Free user turbonutter's Avatar
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    Re: What Front Tyres?

    205-50-15 is aprox 586mm diameter.

  6. #6
    Free user turbonutter's Avatar
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    Re: What Front Tyres?

    Just found this spreadsheet that I used when looking at what tyres to fit to my car.
    Click image for larger version. 

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  7. #7
    Site Supporter ProtoTipo's Avatar
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    Re: What Front Tyres?

    Thanks Neil.

    So a
    205-50-15 is 586mm
    215 TB15 is 612mm

    I've also got (for 205)
    55 ratio at 606mm and
    60 ratio at 627mm

    So maybe 205-55-15 would still be smaller diameter than a TB Michelin?

  8. #8
    Free user turbonutter's Avatar
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    Re: What Front Tyres?

    I get ~607mm for the 205-55-15 which is more or less the same as the tyres you are replacing.. you wount notice 5mm difference ( its less than the diameter change due to tread wear.
    Also as you can see from my spreadsheet the actual tyre sizes do not always exactly match the theoretical diameters either.

  9. #9

    Re: What Front Tyres?

    Michelin Racing Size Designation
    Road legal sizes
    Rolling Circumference
    Recommended Rims
    16/53-13
    175/60R13 72V
    1640 mm
    5 to 6 inches
    20/53-13
    225/45R13 77V
    1635 mm
    7 to 8,5 inches
    15/60-15
    170/65R15 77V
    1847 mm
    5 to 6 inches
    18/60-15
    215/55R15 79V
    1885 mm
    6 to 7.5 inches
    23/62-15
    270/45R15 86V
    1923 mm
    8.5 to 10.5 inches
    26/61-15
    295/40R15 87V
    1891 mm
    10 to 11.5 inches
    29/61-15
    335/35R15 93V
    1903 mm
    11 to 13 inches

    Michelin TB15 sizing..
    The best-laid schemes o' mice an 'men
    Gang aft agley

    Virtutis Gloria Merces
    www.jadefarms.com

  10. #10
    SEC Member ChrisCar6's Avatar
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    Re: What Front Tyres?

    205 / 50 x 15" on my front

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