rodsmallwood52 at btinternet.com
Wed Dec 2 10:41:29 CST 2015
I say.. come on chaps.. this is not math 101.
Any more suggestions for sources of a bit of rubber tube?
On 02/12/2015 16:13, Tony wrote:
> Mathematically, circumference is PI times diameter or 3.14159.....
> times the diameter.
> On 12/2/2015 11:06 AM, Fred Cisin wrote:
>> On Wed, 2 Dec 2015, Paul Koning wrote:
>>> Actually, it's the circumference that matters, not the diameter.
>> I always thought that there was a relatively stable relationship
>> between those! :-)
>> Circumference tends to be a little over 3 times the diameter (3.0 in
>> some states) :-)
>>> Does the circumference of a rubber roll change significantly when
>>> you press on it?
>> If it shifts or squeezes out to the sides, not so much.
>> If it compresses, yes.
>> Before TPMS, some cars got a crude estimation of low tire pressure by
>> comparing the RPM of a tire (ABS sensors) with its fully inflated
>> (circumference changing with pressure change)
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