Tire circumference for cyclocomputer

kak61 said:

Hello, I'd like to install a Cateye MITY 8 CC MT400
cyclocomputer on my Tidal Wave 700C/451. The front tire is
a 25-451 (20 X 1).

On the instruction manual of the cyclocomputer, there is
no such tire circumference size. The nearest sizes are as
follow: 18 X 1.50 setting is 134 L CM 18 X 1.75 settiing
is 135 L CM 20 X 1.75 setting is 152 L CM 20 X 1.3/8
setting is 162 L CM

So how does one calculate the setting to use for tire size
25-451 (20 X 1) please?....

Find a flat sidewalk, driveway, or long hallway with a hard
surfaced floor. Put a gob of mustard, ketchup, paint or
other appropriate gooey substance on the ground. Sit on the
bike and roll over the gob of goo, while maintaining a
straight line (pushing the ground with one's feet usually
works best here). Measure the distance between spots of goo.

--
Tom Sherman – Quad City Area

The diameter of a 451 rim with 25mm tire is 451+25*2 or
501mm. Therefore, the circumference is 151cm (501*3.1416).

Put that in the computer. Ride a true 10 miles on a trail
and then fine tune the setting by a % correction.

eg. if you measure 9 miles for the known 10 mile course,
increase the calibration by 10%.

If you measure 11 miles for the 10 mile course, reduce by
10%.

Hope this helps

Miles (prox.) of Smiles, Tom

Would that measurement be ,edge to edge, or center to
center, of the gob of goo? If the gob was too large it would
throw of the measurement so use a small gob of goo. Look on
the labels of jars of goo to see if they are suitable for
that purpose and make sure it is edible goo,an animal may
decide to eat it off the sidewalk and you don't want to be
on the wrong side of the Animal Rights People! Ben Fox

"Tom Sherman" <[email hidden]> wrote in message news:2i4pjoFint0dU1@uni-
berlin.de...

Quoted message said:

kak61 said:

Hello, I'd like to install a Cateye MITY 8 CC MT400
cyclocomputer on my Tidal

Wave

Quoted message said:

Quoted message said:

700C/451. The front tire is a 25-451 (20 X 1).

On the instruction manual of the cyclocomputer, there is
no such tire circumference size. The nearest sizes are
as follow: 18 X 1.50 setting is 134 L CM 18 X 1.75
settiing is 135 L CM 20 X 1.75 setting is 152 L CM 20 X
1.3/8 setting is 162 L CM

So how does one calculate the setting to use for tire
size 25-451 (20 X

1)

Quoted message said:

Quoted message said:

please?....

Find a flat sidewalk, driveway, or long hallway with a
hard surfaced floor. Put a gob of mustard, ketchup, paint
or other appropriate gooey substance on the ground. Sit
on the bike and roll over the gob of goo, while
maintaining a straight line (pushing the ground with
one's feet usually works best here). Measure the distance
between spots of goo.

--
Tom Sherman – Quad City Area

Ben Fox said:

Would that measurement be ,edge to edge, or center to
center, of the gob of goo? If the gob was too large it
would throw of the measurement so use a small gob of goo.

I suggest using multiple trials and averaging the results.

Quoted message said:

Look on the labels of jars of goo to see if they are
suitable for that purpose and make sure it is edible
goo,an animal may decide to eat it off the sidewalk and
you don't want to be on the wrong side of the Animal
Rights People!

What type of animal would do that - a fox maybe? 😉

Ketchup would be a safe choice, since it is a vegetable.

--
Tom Sherman – Quad City Area

Don't listen to these guys. If you'd like to come on the
newsgroup and claim you rode your favorite ride at a 20mph
pace then adjust the wheel circumference setting by the
appropriate correction. In other words, if you ride the
course at 15 mph according to your present setting then
multiply the present circumference by 4/3rds (20/15).
That'll put you at 20 mph.

See how it works?

If you listen to these guys you never will catch up.

--
--Scott "kak61" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Hello, I'd like to install a Cateye MITY 8 CC MT400
cyclocomputer on my Tidal

Wave

Quoted message said:

700C/451. The front tire is a 25-451 (20 X 1).

On the instruction manual of the cyclocomputer, there is
no such tire circumference size. The nearest sizes are as
follow: 18 X 1.50 setting is 134 L CM 18 X 1.75 settiing
is 135 L CM 20 X 1.75 setting is 152 L CM 20 X 1.3/8
setting is 162 L CM

So how does one calculate the setting to use for tire size
25-451 (20 X

1)

Quoted message said:

please?

Thank you.

By the way, the Cateye MITY 8 cable is way too short. It's
stretched

really

Quoted message said:

taut on my ASS bent.

Too much Ben and Tom. Its been a while since you guys got
involved in your repartee. It suggests that each of you have
too much time on your hands but we are all the better for
it. One question, should the viscosity of the goo be
considered? If you have a thin lightweight tire should you
use goo lite?

Mike S. St. Louis, Mo.

Quoted message said:

So how does one calculate the setting to use for tire size
25-451 (20 X 1) please?

I would refer you to my post of a while back on this
subject.

+group:alt.rec.bicycles.recumbent&start=10&hl=en&lr=&ie=UTF-
8&group=alt.rec.bicycles.recumbent&safe=off&selm=ee23b69c.0-
212100839.45270b77%40posting.google.com&rnum=13

Jerry Rhodes

Jerry Rhodes said:

Quoted message said:

So how does one calculate the setting to use for tire size
25-451 (20 X 1) please?

I would refer you to my post of a while back on this
subject.

roup:alt.rec.bicycles.recumbent&start=10&hl=en&lr=&ie=UTF-
8&group=alt.rec.bicycles.recumbent&safe=off&selm=ee23b69c-
.0212100839.45270b77%40posting.google.com&rnum=13

How inconsiderate! An animal with a peanut allergy might
come along and eat the peanut butter.

--
Tom Sherman – Quad City Area

IMHO, the important criterium is evaporation rate. If you're
quick with the tape measure, for instance, you could use
spit, which has certain advantages. If you get busy after
you measure and set the computer (like going for a ride) and
forget to clean up your goo, your wife will probably give
you a ration, but with spit, the evidence disappears. And
you don't have to go looking for some spit.

"mike s" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Too much Ben and Tom. Its been a while since you guys got
involved in your repartee. It suggests that each of you
have too much time on your hands but we are all the better
for it. One question, should the viscosity of the goo be
considered? If you have a thin lightweight tire should you
use goo lite?

Mike S. St. Louis, Mo.

"Tom Sherman" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Jerry Rhodes said:

Quoted message said:

So how does one calculate the setting to use for tire
size 25-451 (20 X

1)

Quoted message said:

Quoted message said:

Quoted message said:

please?

I would refer you to my post of a while back on this
subject.

Are you now taking cues from how the British Prime Minister
answers his critics in Parliament?

--
Ed Dolan - Minnesota

"kak61" <[email hidden]> wrote in message
news:<[email hidden]>... The front tire is a 25-
451 (20 X 1).

Quoted message said:

On the instruction manual of the cyclocomputer, there is
no such tire circumference size. The nearest sizes are as
follow: ...

Quoted message said:

20 X 1.3/8 setting is 162 L CM

1-3/8" is more or less 451. But the roll out method is
more accurate.

John Riley

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

Quoted message said:

Don't listen to these guys. If you'd like to come on the
newsgroup and claim you rode your favorite ride at a 20mph
pace then adjust the wheel circumference setting by the
appropriate correction. In other words, if you ride the
course at 15 mph according to your present setting then
multiply the present circumference by 4/3rds (20/15).
That'll put you at 20 mph.

See how it works?

If you listen to these guys you never will catch up.

Hmmm... I'm thinking you've been in Washington too long
Scott ;-) That sounds like the D.C. way ;-)

John Riley