Measuring tire circumference

lilillill · Aug 16, 2016

Ridgeline said: ↑

it must be something in the water.

You can do two things,

Take a string and wrap it around the tire. Then mark off where they meet, then measure that.

Or

Just look it up.

I prefer the last thing myself.

By the way two other things.

Why would you need to measure them?

And what is an endless steel tape?
Click to expand...

As for why to measure them? I can only relate my own experience.... I had two out of round steer tires shaved to match exact circumference in order to run them next to each other on a single hub.

I guess if you were trying to match up used tires to run as duals you'd want them to be the same circumference too.

acik1983 · Aug 16, 2016

Ridgeline said: ↑

it must be something in the water.

You can do two things,

Take a string and wrap it around the tire. Then mark off where they meet, then measure that.

Or

Just look it up.

I prefer the last thing myself.

By the way two other things.

Why would you need to measure them?

And what is an endless steel tape?
Click to expand...

Well, running uneven duals isn't exactly ideal. Just looking for something to make it a little easier for the shop, that's all.
Goodyear recommended a 14' endless steel tape which is apparently a tool to measure circumference, however, finding one is another story. Guess it's a unicorn.

AModelCat · Aug 16, 2016

scottied67 said: ↑

If you look at the title to the youtube video I posted I had corrected my mistake. I don't use these type of calculations very often lately-- at least 20 years.

I worked on the new Cypress Freeway in Oakland CA years ago. The pilings we drove for the new column foundations were 42 inch pipe 70 feet long. Drive it down to about 4 feet above ground then weld another 70 footer on top of that and drive it down and cut it off at the proper grade a few inches above the bottom of the cofferdam which was 15 feet deep. The cofferdams were hexagon shaped, with one piling in each corner and piling in the middle. We'd then drill out the bay mud from the pilings 70 feet down, drop in a 20 foot rebar cage inside the pipe piling with about 8 feet sticking above the pipe and fill them with concrete.

That is where we had to be good at the math, 7 pilings 70 feet deep 42 inches around and tell the superintendent how many concrete trucks to order up.

Once those were poured, the ironworker would set to work in the big hexagon cofferdam-- about 40 feet across and do his rebar work. Then of course we'd again have to figure out how many concrete trucks to order in to fill this 15 foot deep 40 foot across hexagon
shaped hole in the ground.
Click to expand...

Ahh ok. I missed that.

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