Recumbent bicycles · Public discussion

Tire circumference for cyclocomputer

Started by kak61 · · Last activity · 13 posts · 822 views

Thread navigation

Jump through the discussion

Go to the original post, the replies on this page, or the latest preserved contribution.

Thread details

What we know about this thread

Original section
Recumbent bicycles
Published
2 June 2004
Last activity
3 June 2004
Original author
kak61
Posts
13
Discussion status
Public discussion
Total views
822
Views / 30 days
0
Topics

The navigation and discussion metadata provide context. Posts remain in their original chronological order.

Showing posts 1–13 of 13
Posts remain in their original chronological order.

Text size
  1. 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?

    Thank you.

    By the way, the Cateye MITY 8 cable is way too short. It's stretched really
    taut on my ASS bent.

  2. 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

  3. 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

  4. 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:[email hidden]...

    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

  5. 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

  6. 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.

  7. 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.

  8. 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.

    http://groups.google.com/groups?q=PEANUT+BUTTER+group: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

    Jerry Rhodes

  9. 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.

    http://groups.google.com/groups?q=PEANUT+BUTTER+group: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

  10. 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.

  11. "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

  12. "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

  13. "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

Active in the last 60 minutes

Active in this thread

0 users · 0 guests ·0 bots ·0 total

No signed-in users are active right now.

No known search crawlers active right now.