project

You need to find the outside circumfrence of the tire, because that will
differ depending on your tire.

An easy way to find the circumfrence is to measure the height of the
tire (while the tire is on the wheel). then the Circumfrence= Height x
3.14.

Measure in feet and convert it to a decimal. (ex. 1 ft and 3 in = 1.25
ft)

Now there are 5280 feet in a mile. so divide 5280 by the circumfrence
and that is the number of rotations it takes to go a mile.

Of coarse the answer will be different depending on the wheel and tire
you measure.

Let us know the results!

--
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Crank length wont effect this number, but it may effect how fast you can
ride the mile!

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i did it differnet ly but i have a 129 in math and have verified it with
3 differnt sources here r the results
36"-1760
29"-2190
26"-2444
24"-2640
20"-3300
16"-4061

--
skianduniaddict

number1 under 15 skiier in the united states
ski sugarloaf uni bradbury
my cat bob ate four kids😉

Bear said:

I am Bear. I can ride a unicycle. How are you dooing?

bear is my new main man
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skianduniaddict said:

i did it differnet ly but i have a 129 in math and have verified it with
3 differnt sources here r the results
36"-1760
29"-2190
26"-2444
24"-2640
20"-3300
16"-4061

Without checking the rest, I can see that the first one is wrong.

You have used the diameter, not the circumference.

A mile is 1,760 yards.
A yard is 36 inches.

The circumference of a wheel is Pi x the diameter, or 2 x Pi x the
radius.

So, a 36 inch uni does Pi yards per revolution.

Counting Pi as 3.142

1760/Pi = 560 revolutions to the mile

To find the circumference of a wheel, take the diameter (20, 24, 26
etc.) and multiply by 3.142.

Now you have a circumference in inches. What is a mile in inches?

Simply, it is 1760 (yards in a mile) x 36 (inches in a yard)

1760 x 36 = 63,360

That means there are 63,360 inches in a mile. That's why old inch/mile
maps were in 1:63360 scale.

So, take 63360 inches (a mile) and divide by the circumference in
inches.

Taking the Coker again:

36 inch diameter x 3.142 = 113.112 inches circumference.

63360 / 113.112 = 560.15

The accuracy of your answer will depend on how many decimal places you
take for Pi. From memory, Pi = 3.1415926535 approx.

--
Mikefule

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Mike is correct. Those numbers are off.

He is saying exactly what I said.

But I am still not sure that the actual outside diameter of a coker
tire is truly 36 in. Can someone verify this?

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The outside diameter of a Coker tyre at normal pressure with no load is
as near as dammit 36 inches. An allowance could be made for
deformation under load, but as a percentage, this would be minimal.

Let's not do the whole project. Leave some challenge for the
student.😉

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At this rate we will have done his maths project for him!

I wish i knew about the forums while i was still at school!

Rock on!
Edd

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There is a thread about this form terrybigwheel, everything is very well
explained in there, I suggest checking it out =p

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Mikefule said:

The outside diameter of a Coker tyre at normal pressure with no load is
as near as dammit 36 inches. An allowance could be made for
deformation under load, but as a percentage, this would be minimal.

Let's not do the whole project. Leave some challenge for the
student.😉

Thanks, for some reason it makes me fell better knowing that.

It could also depend on how you define a mile. If it is a pre-marked
distance then you would have to ride your uni in a straight line, which
may be easy for some people, but not me!

--
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sorry i blew thAT AND I HADED IT IN SO ITS redo time

--
skianduniaddict

number1 under 15 skiier in the united states
ski sugarloaf uni bradbury
my cat bob ate four kids😉

Bear said:

I am Bear. I can ride a unicycle. How are you dooing?

bear is my new main man
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I'm sorry i'm not contributing in any way but this would have been so
much easier if you used metric :P

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Considering the orginal question was 'how many rev's to go one MILE', I
dont see how using the metric system would help.

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Everything would be easier if we used metric. 🙂

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i have them i did wheel 63360"/(diameter x 3.14)
36"-560
29"-695
26"-776
24"-840
20"-1008
18"-1121

--
skianduniaddict

number1 under 15 skiier in the united states
ski sugarloaf uni bradbury
my cat bob ate four kids😉

Bear said:

I am Bear. I can ride a unicycle. How are you dooing?

bear is my new main man
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Smeltz said:

But I am still not sure that the actual outside diameter of a coker
tire is truly 36 in. Can someone verify this?

http://www.xs4all.nl/~klaasbil/coker_rollout.htm

Klaas Bil - Newsgroup Addict
--
"I'm slowly but surely stealing Wales and bringing it back to my house on the wheel, frame and cranks of my muni. - phil"

Smeltz said:

But I am still not sure that the actual outside diameter of a coker
tire is truly 36 in. Can someone verify this?

It depends on rider weight, tyre wear, tyre pressure, see
http://www.xs4all.nl/~klaasbil/coker_rollout.htm

Also wobbliness is a factor, not for the diameter of the wheel per se,
but for the number of revolutions per mile.

Klaas Bil - Newsgroup Addict
--
"I'm slowly but surely stealing Wales and bringing it back to my house on the wheel, frame and cranks of my muni. - phil"