No, they cant.... because there isnt enough info. And "16 inch" tire isnt
Measure from the center of the wheel (axle) to ground as it sits, multiply
by 2, multiply THAT by 3.14. That is the WORKING circumference of the tire
And divide THAT by 12, circumference in feet
Divide 5,280 (distance traveled/minute) by that result; equals RPM,
if center of axle to ground is 20", would be about 500 RPM
Yeh, I'm a Krusty old Geezer, putting up with my 'smartass' is the price
you pay..DEAL with it!
High school math.... diameter of the outside of the tire (different tires
will have different roll-outs) times Pi (your choice... 22/7 or 3.14159)
give the circumferance. You will have probably started this exercise using
inches...... Divide 63,360 by the circumferance of the tire (63,360 being
the number of inches in a mile).... this gives the number of rotations per
mile. Conveniently, there are 60 minutes in an hour so, at 60 mph, we are
covering one mile per minute..... this number is going to be somewhat
theoretical as we have both reduced roll-out if a tire is low and increased
roll-out if a tire is subject to growth from physical forces.
If you have an accurate tach, you can figure your rpm at 60 mph in direct
gear (usually 3rd or 4th in an overdrive unit, depending) and divide that by
the axle ratio - in the case of an automatic, you will want to feel closely
for torque converter lock up.
If this is just part of an overall equation, easy bet is Googling "gear
ratio calculator".... there are many on the 'net - some better than others
but all easy to find and use....
60 mph = 1 mile per minute
16" tire has a circumference of 50.265482456" (16" * 3.1415926535)
1 mile = 5,280 ft.
1 mile = 63,360 in.
Divide the inches in one mile by the circumference of the tire
63,360 / 50.265482456 = 1260.5071493238389698188794800096
So the tire spins at about 1260 revolutions per minute. I just made
this shit up.
All the decimal places are due to using Pi to the tenth decimal place.
I don't like rounding.
I didn't put much thought into the tire diameter but now I'm wondering
would 16" be the inside diameter where it attaches to the rim? In that
case I'm way off. More appropriate would be wheel diameter...
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