Fastest speed on a coker?

Klaas Bil wrote:
*Not being able to make a single choice in this matter, the
spreadsheet in which I record my road rides calculates both tyre speed
and road speed.*

That's really pretty hardcore... But I think it's nice that you'd have
at least three different potential answers to the question "How quickly
did your tyre wear out?"


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Takayuki's 100 mile uni was a 43" air tire heavy thing. Those old wheels
had massive rims and tires that were designed for industrial use on
rickshaws or something similar. Heavy! I'm not sure about the crank
length. Probably around 125 but I don't know if I was ever told that.
Jack Halpern might know. I think the unicycle belonged to him, or was
the same as one he owned.

Takayuki was also racing with fellow 100-miler Floyd Beattie, who had
previously held the record. Floyd was probably on his 45" (unknown crank
length), but lost the race by a wide margin.

I think the terrain for the record ride was pretty flat. It was a bike
path, on which they rode back and forth. I think they even had to do
tight turnarounds at each end, but not sure about that. Again Jack
Halpern might be able to fill in some of the details.

If you are preparing for your first century, I would advise against
working toward survival. After you've got a few centuries under your
belt, you can shoot for the record. Takayuki's record is *way* beyond
all the previous 100 mile times, and impresses even bicyclists. I think
the second-fastest century on a unicycle is somewhere over 8 hours, but
I'm not sure. This should be researchable with old Guinness books.

Good luck on your century!


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johnfoss wrote:
*If you are preparing for your first century, I would advise against
working toward survival. *
CORRECTION:
Remove "against!" I meant to say I advise against trying for that
amazing record on your first century attempt. It was not the first time
Takayuki had done it.


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Someone on a geared Coker might have a chance of breaking Takayuki
Koike's 100 mile record. Harper's hub is geared at 1:1.5 (one turn of
the pedals yields 1.5 turns of the wheel). Put that hub on a Coker
wheel and you've got about a 54" effective wheel. You could go quite
fast on that. I hope they wear appropriate safety equipment because a
UPD at that speed would be nasty. A German fellow has a geared hub that
is geared at around 1:1.67 which would give a Coker wheel a 60"
effective diameter. Someone is going to challenge the 100 mile record
and it will probably be on a geared up Coker wheel.

But 6:44 for a 100 mile ride on a unicycle is amazing. I'd be happy
doing a century in 6:44 on a bike (but I take rest stops when I do a
century on a bike )


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Klaas Bil wrote:
*
Not being able to make a single choice in this matter, the spreadsheet
in which I record my road rides calculates both tyre speed and road
speed.
*


Hmm, if there is a constant linear relationship between the two numbers,
isn't maintaining both like reporting tire diameter and circumference?

I'm sure the relationship isn't linear, but I doubt anyone has the
equipment to make anything other than a guess at wheel speed.

However, I can see you point. I would not like to brag about my wages
after taxes have take their nibble, which is far greater than 3%.


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johnfoss wrote:
*CORRECTION:
Remove "against!" I meant to say I advise against trying for that
amazing record on your first century attempt. It was not the first
time Takayuki had done it. *


Thanks John. That certainly is pretty amazing. I make that to be an
average speed of 23.76km/h! But I was afraid you were going to say he
rode a 24' unicycle, not that it makes it any less impressive!

I took my Coker for a 30km spin today and managed little over 20km/h
That was over fairly hilly terrain with 150mm cranks. I think I'd be
able to do 160km with a bit of training, but I doubt I'd average much
more than 20km/h even with shorter cranks. Realistically we're aiming
for 8-10hrs. There should be quite a few of us doing this ride so
hopefully we'll go faster (As a Coker peleton????- is there such a
thing???) I wonder if drafting at 20km/h will save us a few minutes
over 160km?


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On Fri, 5 Sep 2003 15:58:49 -0500, john_childs
wrote:

A German fellow has a geared hub that
is geared at around 1:1.67 which would give a Coker wheel a 60"
effective diameter.
You probably mean Frank Bonsch? His hub gear ratio is actually
1:1.5833 so the Coker would effectively be 57".

Klaas Bil - Newsgroup Addict
--
If the crank is moving then it really sounds as if it's loose. - onewheeldave trying to pinpoint the cause of a clicking crank

john_childs wrote:

Someone on a geared Coker might have a chance of breaking Takayuki
Koike's 100 mile record. Harper's hub is geared at 1:1.5 (one turn of
the pedals yields 1.5 turns of the wheel). Put that hub on a Coker
wheel and you've got about a 54" effective wheel. You could go quite
fast on that. I hope they wear appropriate safety equipment because a
UPD at that speed would be nasty. A German fellow has a geared hub that
is geared at around 1:1.67 which would give a Coker wheel a 60"
effective diameter. Someone is going to challenge the 100 mile record
and it will probably be on a geared up Coker wheel.

I would agree almost 100%, John! I would rule out big wheels larger
than the Coker. Direct ride may still triumph!

But 6:44 for a 100 mile ride on a unicycle is amazing. I'd be happy
doing a century in 6:44 on a bike (but I take rest stops when I do a
century on a bike )

John Foss reminded us that Takayuki's unicycle for this Guinness record
was a 43" wheel with pneumatic tire. It is still extremely impressive
that he did that 100 mile ride in 6:44, since he averaged 14.85 MPH for
nearly 7 hours!

Sincerely,

Ken Fuchs

Klaas Bil wrote:
*On Fri, 5 Sep 2003 15:58:49 -0500, john_childs
wrote:

A German fellow has a geared hub that
is geared at around 1:1.67 which would give a Coker wheel a 60"
effective diameter.
You probably mean Frank Bonsch? His hub gear ratio is actually
1:1.5833 so the Coker would effectively be 57".

Klaas Bil - Newsgroup Addict
*

Yes, I was thinking of Frank Bonsch.
I somehow got in in my brain that his hub was 1:1.67 which is incorrect.
Harper has corrected me on that on more than one occasion.

Now that you have reminded me of his name I can find his web site.
'UniFrank' (http://www.unicycle.de.vu/)
He has a picture of his hub under "unicycle prototype"

The big advantage to Frank's hub ratio is that it will result in even
tire wear. Harper's hub ratio of 1:1.5 will still cause tire wear in
two spots so you'll still need to rotate the tire on the rim to get even
tire wear.


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Hey! I can nit pick too!

Klaas wrote:

You probably mean Frank Bonsch? His hub gear ratio is actually
1:1.5833 so the Coker would effectively be 57".


From Ken Fuchs' Coker tire roll out dimensions I calculate the effective
diameter of a Coker tire to be 34.7" so with the Frank Bonsch hub the
Coker would be effectively 55".

John Childs wrote:

The big advantage to Frank's hub ratio is that it will result in even
tire wear. Harper's hub ratio of 1:1.5 will still cause tire wear in
two spots so you'll still need to rotate the tire on the rim to get
even tire wear.


Actually Harper's hub will result in *four* wear spots 90 degrees apart
instead of two. Also John, you forget about switching the hub to 29"
mode ... there's three possible places to anchor the arm dingus so if
the hub is switched from 29" to 43.5" often, the tire should wear fairly
even.

To further nit pick ...

I measure the roll out circumference of the 29" Big Apple to be 89.6".
That's a diameter of 28.52" so the Harper hub actually makes an
effective wheel diameter of 42.8" ... with that tire anyway.

So there!!

Steve Howard


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