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July 28th, 2004 09:26 PM #1
What is the approx. RPM of a car's wheel travelling at 100KPH?
Wheel size 15 inch mags with 195/55/15 tires.
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July 28th, 2004 09:55 PM #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.
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July 28th, 2004 10:36 PM #5Originally posted by mbt
tama na siguro yan hehehehe :bwahaha:
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July 29th, 2004 01:08 AM #6
hahaha.
hanggat wala pang mas matiyaga kay wildthing tama na yan. hehehe
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July 29th, 2004 01:19 AM #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 ?
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July 29th, 2004 03:25 AM #9
may nakalimutan pa kayuuu hehe Tranny ratio pa..hehe
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kakatamad tignan yung figure!
paro sakin 195/55/15 60mph*sub2000rpm
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July 29th, 2004 08:36 AM #10Originally 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.
see my pahabol statement above. i mean, i can go on vacation anytime. but my spouse has her...
Traffic!