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  1. Join Date
    Oct 2002
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    29,354
    #1
    What is the approx. RPM of a car's wheel travelling at 100KPH?

    Wheel size 15 inch mags with 195/55/15 tires.

  2. Join Date
    Oct 2002
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    4,614
    #2
    what's the equivalent overall diameter of a 195/55/15 wheel and tire?

  3. Join Date
    Jan 2004
    Posts
    3,362
    #3
    Hmmm...If we assume 100Km/h is the "true" speed, and not just what the speedometer shows, which is sometimes inaccurate, and we assume also that the 195/55/15 is inflated to make the radius of the tire precisely the ff:

    195mm x 0.55 = 107.25mm
    Diameter of rim: 15in x 25.4mm = 381mm
    Diameter of wheel: 381mm + (107.25mm x 2)= 595.5mm
    Circumference of wheel: 595.5mm x 3.1416 = 1870.82mm approx.

    Now, 100km/h means the car is travelling 100,000,000mm per hour.

    So the car is travelling 100,000,000mm / 60 = 1,666,666.67mm per minute.

    1,666,666.67mm / 1870.82mm = 890.87 revolutions per minute, assuming a relatively smooth surface and a straight line. We all know that when turning, outer wheels travel farther than the inner wheels, hence more turns. Also, going over bumps or potholes may affect wheel spin.

    Of course, I am not a math wizard so the above computation could be wrong.
    Last edited by the_wildthing; July 28th, 2004 at 09:58 PM.

  4. Join Date
    Oct 2002
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    4,614
    #4
    tama na siguro yan hehehehe :bwahaha:

  5. Join Date
    Oct 2002
    Posts
    7,205
    #5
    Originally posted by mbt
    tama na siguro yan hehehehe :bwahaha:
    hahaha...naalala ko yung prof ko na tamad mag-check.

  6. Join Date
    Oct 2002
    Posts
    4,388
    #6
    hahaha.

    hanggat wala pang mas matiyaga kay wildthing tama na yan. hehehe

  7. Join Date
    Oct 2002
    Posts
    4,614
    #7
    teka, ano ibig sabihin nung 25.4 mm sa "diameter of rim"? hehe

    hindi ba dapat, 15 inches x (300 mm/12 inches) = 375 mm ?

  8. Join Date
    Jan 2004
    Posts
    3,362
    #8
    1 inch = 2.54 cm = 25.4 mm, di ba?

  9. Join Date
    Jun 2004
    Posts
    508
    #9
    may nakalimutan pa kayuuu hehe Tranny ratio pa..hehe
    >>

    kakatamad tignan yung figure!

    paro sakin 195/55/15 60mph*sub2000rpm

  10. Join Date
    Oct 2002
    Posts
    29,354
    #10
    Originally posted by the_wildthing
    Hmmm...If we assume 100Km/h is the "true" speed, and not just what the speedometer shows, which is sometimes inaccurate, and we assume also that the 195/55/15 is inflated to make the radius of the tire precisely the ff:

    195mm x 0.55 = 107.25mm
    Diameter of rim: 15in x 25.4mm = 381mm
    Diameter of wheel: 381mm + (107.25mm x 2)= 595.5mm
    Circumference of wheel: 595.5mm x 3.1416 = 1870.82mm approx.

    Now, 100km/h means the car is travelling 100,000,000mm per hour.

    So the car is travelling 100,000,000mm / 60 = 1,666,666.67mm per minute.

    1,666,666.67mm / 1870.82mm = 890.87 revolutions per minute, assuming a relatively smooth surface and a straight line. We all know that when turning, outer wheels travel farther than the inner wheels, hence more turns. Also, going over bumps or potholes may affect wheel spin.

    Of course, I am not a math wizard so the above computation could be wrong.
    Thanks for the compute... I need to verify something kasi.

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kinda a math question