help with my cycle computer

are you having trouble physically mounting it or problems programming?

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pkplonker said:

I am running a cateye velo 5 on a 26" wheel. However i am unsure that it
is reading correctly. I cant have it near the outside of the wheel as
there is to much gap between magnet and sensor so i have shifted it
into the middle more. to be exact its 13cm form the centre of the hub.
I am just not sure how to set it up so it reads correctly.

The distance from the hub isn't important as long as the magnet is
within a couple of mm from the sensor. Every time the wheel goes
round, you would have ridden a set distance (around 2050mm), and the
sensor will pick up one pass of the magnet. The distance from the hub
doesn't come in to that equation.

STM

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semach.the.monkey said:

The distance from the hub isn't important as long as the magnet is
within a couple of mm from the sensor. Every time the wheel goes
round, you would have ridden a set distance (around 2050mm), and the
sensor will pick up one pass of the magnet. The distance from the hub
doesn't come in to that equation.

STM

so, i simply measure the circumference of the tire and put that in and
i can move my sensor and magnet anyway along the fork?

Oh and is 24mph a speed I could reach on a b*ke on straight tarmac?

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pkplonker said:

so, i simply measure the circumference of the tire and put that in and i
can move my sensor and magnet anyway along the fork?

Yes, that's right

pkplonker said:

Oh and is 24mph a speed I could reach on a b*ke on straight tarmac?

Probably. You'd have to be gunning it a bit, but it's achievable
though. You won't get anywhere near that on a 26" uni though 😄

STM

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pkplonker said:

so, i simply measure the circumference of the tire and put that in and i
can move my sensor and magnet anyway along the fork?

its worth measuring the circumference by rolling the uni with your
weight on it, you flatten the tyre a significant amount and it effects
the circumference

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pkplonker said:

is 24mph a speed I could reach on a b*ke on straight tarmac?

Depends on your gear ratio. I have a fixed gear bike with a 42 tooth
chainring in front and a 15 tooth cog in the rear....that's very do
able. I also have a single speed mtb with 40 teeth in front and 19 in
back...that'd be a lot harder to get up to that speed. Figure out your
gearing ratios and teeth on your chainrings/cogs and throw them in this
nifty little calculator:

http://www.sheldonbrown.com/gears/

Select "speed at 120RPM" and itll tell you about how fast you can
comfortably go at that gear ratio since 120RPMs is pretty brisk for a
b*ke cadence

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kington99 said:

its worth measuring the circumference by rolling the uni with your
weight on it, you flatten the tyre a significant amount and it effects
the circumference

This is a good starting point, but it might require fine tuning... or
at least it might if you're as pedantic as I am.

If you've a bike path in the area that has mile (or kilometer) markers
you may want to use that to double-check your computer's settings.
Luckily, I have a path nearby with lines drawn across the way every 1/4
mile. Now my compy's dialed IN!

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maestro8 said:

This is a good starting point, but it might require fine tuning... or at
least it might if you're as pedantic as I am.

If you've a bike path in the area that has mile (or kilometer) markers
you may want to use that to double-check your computer's settings.
Luckily, I have a path nearby with lines drawn across the way every 1/4
mile. Now my compy's dialed IN!

Very nice, i presume this is to reduce measuring inaccuracy by
averaging, and to take in to account that unicyclists don't go in
straight lines.

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Yes, the straight line issue is definitely something you'd want to know
about if you plan on using your computer for very accurate rides. I've
noticed on my cycling computer last year at RAGBRAI that the final
measurements for a 70 mile day would be 1-3 miles off due to the path
that the wheel follows with its natural wobble. Some of that was
likely due to the settings being slightly off due to tiny differences
in rollout too.

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Quoted message said:

Originally Posted by johnfoss
Yes, being old makes you stupid.

Quoted message said:

Originally Posted by jerrick
I think we should get off the topic off kinky/horny girls and
unicycles, and back to creepy horny men.

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kington99 said:

take in to account that unicyclists don't go in straight lines.

Actually, that might be a great way to improve on one's wobble... to
calibrate their computer using such a method, then re-calibrating later
and going for less error (from a straight-line path).

Dunno how one could measure their error, though. Any thoughts?

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The straight line issue is as much a matter of calibration accuracy, as
it is a matter of definition. You can perfectly well argue that the
distance you ride on your unicycle is the distance that the centre of
the tyre contact patch has travelled, including all the wobbling it
does. In my own measurements, wobble is on the order of 3% (depending
on rider, wheel size, speed, etc), which coincides quite well with 1 to
3 miles on a 70 mile trip.

I've written some more blurb on the various ways of defining distance
and speed on my 'Coker Rollout Page'
(http://www.xs4all.nl/~klaasbil/coker_rollout.htm). Keep in mind that
this page was written in 2004, there are a lot more 36" options now.
But the distance definition issue hasn't changed.

mouse said:

Yes, the straight line issue is definitely something you'd want to know
about if you plan on using your computer for very accurate rides. I've
noticed on my cycling computer last year at RAGBRAI that the final
measurements for a 70 mile day would be 1-3 miles off due to the path
that the wheel follows with its natural wobble. Some of that was
likely due to the settings being slightly off due to tiny differences
in rollout too.

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IMHO, wobble should not be considered in cycle computer calculation. You
want to add a built-in "lie" to the numbers your computer puts out?
Better to be aware of the wobble and work to ride straighter, if
cranking out miles/kilometers is your main goal.

All of my wobbles count!

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If cranking out miles is your main goal and all of your wobbles count,
then why would you want to work to ride straighter? The more you wobble
on a given course, the more miles you crank out.

johnfoss said:

IMHO, wobble should not be considered in cycle computer calculation. You
want to add a built-in "lie" to the numbers your computer puts out?
Better to be aware of the wobble and work to ride straighter, if
cranking out miles/kilometers is your main goal.

All of my wobbles count!

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