Wheel size

"John" <hjletendreattownispdotnospamcom> wrote in message
news:[email hidden]...

Quoted message said:

This is a simple question. I am putting a computer on my bike and it says
to measure the wheel size and them multiply it by 3.14 something. When
measuring the wheel size is it just the rim or the the diameter with the
tire. I have a Trek 4500 and without the tire it is 22"
Thanks,
John

Since I am simple minded, I put a mark on the tire then roll the bike one
revolution on the sidewalk and measure the starting and ending point. Due
to my advanced math skills I use a metric tape measure.

John said:

This is a simple question. I am putting a computer on my bike and it
says to measure the wheel size and them multiply it by 3.14
something. When measuring the wheel size is it just the rim or the
the diameter with the tire. I have a Trek 4500 and without the tire
it is 22"
Thanks,
John

Measure with the tire on and inflated. The computer counts the distance
(circumference) the wheel travels in one revolution.

Mike - easy as pi ;^)

Thank You!

"Michael Dart" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

John said:

This is a simple question. I am putting a computer on my bike and it
says to measure the wheel size and them multiply it by 3.14
something. When measuring the wheel size is it just the rim or the
the diameter with the tire. I have a Trek 4500 and without the tire
it is 22"
Thanks,
John

Measure with the tire on and inflated. The computer counts the distance
(circumference) the wheel travels in one revolution.

Mike - easy as pi ;^)

Might want to take a smidgin off, as when you sit on the bike the tyre
compresses, unless you are running 60psi+ 😉 I usually pump it up as
normal, then sit on and measure the distance from ground to axle/QR
centre. From that use 2*pi*measurement to get circumference.

"John" <hjletendreattownispdotnospamcom> wrote in message
news:[email hidden]...

Quoted message said:

"Michael Dart" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

John said:

This is a simple question. I am putting a computer on my bike and it
says to measure the wheel size and them multiply it by 3.14
something. When measuring the wheel size is it just the rim or the
the diameter with the tire. I have a Trek 4500 and without the tire
it is 22"
Thanks,
John

Measure with the tire on and inflated. The computer counts the distance
(circumference) the wheel travels in one revolution.

Mike - easy as pi ;^)

Quoted message said:

Thank You!

Yeah, as someone else said - mark the tyre and ground at that point, get on
the bike (this will effect the tyre's effective circumference, making it
more or less the same as when you are riding it), roll it one time until the
mark is back at the ground point, mark the ground again, measure, and put
that number in.

Shaun aRe

"Dean A. Stepper" <[email hidden]> scribbled on the stall wall: >

Quoted message said:

"John" <hjletendreattownispdotnospamcom> wrote in message >

news:[email hidden]... >> This is a simple question. I
am putting a computer on my bike and it says >> to measure the wheel size
and them multiply it by 3.14 something. When >> measuring the wheel size
is it just the rim or the the diameter with the >> tire. I have a Trek
4500 and without the tire it is 22" >> Thanks, >> John >> > Since I am
simple minded, I put a mark on the tire then roll the bike one >
revolution on the sidewalk and measure the starting and ending point.
Due > to my advanced math skills I use a metric tape measure.

yup...this is the simplest way to do it.

a 26x2.1 tire measures (about) 204cm...some calibration will be required
after riding it a bit though.

--
dual 2.8Ghz Xeon; 2GB RAM; 500GB ATA-133; nVidia powered Linux
2.6.10;glibc-2.3.5; vendor neutral home-brewed installation

--anything after this line is ANNOYING [censored] that the newsserver adds--
-directly contact newsfeeds and ISPs that piggy back them to complain-

----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==----
http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups
----= East and West-Coast Server Farms - Total Privacy via Encryption =----

Shaun aRe said:

"John" <hjletendreattownispdotnospamcom> wrote in message
news:[email hidden]...

Quoted message said:

"Michael Dart" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

John wrote:

>This is a simple question. I am putting a computer on my bike and it
>says to measure the wheel size and them multiply it by 3.14
>something. When measuring the wheel size is it just the rim or the
>the diameter with the tire. I have a Trek 4500 and without the tire
>it is 22"
>Thanks,
>John

Measure with the tire on and inflated. The computer counts the distance
(circumference) the wheel travels in one revolution.

Mike - easy as pi ;^)

Quoted message said:

Thank You!

Yeah, as someone else said - mark the tyre and ground at that point, get on
the bike (this will effect the tyre's effective circumference, making it
more or less the same as when you are riding it), roll it one time until the
mark is back at the ground point, mark the ground again, measure, and put
that number in.

Shaun aRe

Or better, roll it multiple times (e.g. 10 times) and divide the outcome
by 10. This will minimize the error by a factor 10 also...

Manuel

John said:

When measuring the wheel size is it just the rim or the the diameter with the
tire.

That depends on whether you intend to ride the bike on the rims only,
or with the tyre mounted. I find tyres quite useful in this respect.
Steve.

"manuel borowski" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Shaun aRe said:

"John" <hjletendreattownispdotnospamcom> wrote in message
news:[email hidden]...

Quoted message said:

"Michael Dart" <[email hidden]> wrote in message
news:[email hidden]...

>John wrote:
>
>>This is a simple question. I am putting a computer on my bike and it
>>says to measure the wheel size and them multiply it by 3.14
>>something. When measuring the wheel size is it just the rim or the
>>the diameter with the tire. I have a Trek 4500 and without the tire
>>it is 22"
>>Thanks,
>>John
>
>Measure with the tire on and inflated. The computer counts the

distance

Quoted message said:

Quoted message said:

Quoted message said:

>(circumference) the wheel travels in one revolution.
>
>Mike - easy as pi ;^)

Quoted message said:

Thank You!

Yeah, as someone else said - mark the tyre and ground at that point, get

on

Quoted message said:

Quoted message said:

the bike (this will effect the tyre's effective circumference, making it
more or less the same as when you are riding it), roll it one time until

the

Quoted message said:

Quoted message said:

mark is back at the ground point, mark the ground again, measure, and

put

Quoted message said:

Quoted message said:

that number in.

Shaun aRe

Or better, roll it multiple times (e.g. 10 times) and divide the outcome
by 10. This will minimize the error by a factor 10 also...

Indeed, and don't forget to not pull any wheelies while riding or it'll
throw yourreadings off ',;~}~

Shaun aRe

26X1.95