Re: two-geared uni - Page 2

joemarshall wrote:
> */.../ As for the ratio, there's a limit to how high a gearing up you
> can get from a single set of epicyclic gears (I think it may be 2:1) ,
> as you get closer to it, you have to use smaller and smaller and more
> delicate gears for a given hub size, /.../
>
> Joe *


Too bad, I had hoped we soon would be riding around with something like
the 14-geared 'Rohloff' (http://www.rohloff.de/) hub on our unis.


golden hub


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harper wrote:
> *Any gear ratio design must meet all of these constraints. *
thanx
i managed to impress myself by actually following most of that

your description makes the hub sound like a symphony



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So can some explain how you could tap the button to change gear with out
killing yourself ??


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Is the hub ever going to be offered alone, so one can use said hub to
build out a geared Coker.


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wilbert wrote:
> *So can some explain how you could tap the button to change gear with
> out killing yourself ?? *


You have to be fast with your feet or aim really well with your
hammer... But I don't recommmend using a hammer. If you get it between
the spokes you'll be flying. And I don't recommend putting your feet
between the spokes either. You'll probably end up flying a shorter
distance, with your foot smashing to the frame, probably get a few toes
cut off by the spokes, smashing your chin to the ground and going home
crying for mom.

Well, you just have to be able to ride with one foot and be fast enough
to kick the button with the other, before the pedal comes back up again
and destroys your ankle.


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joona wrote:
> *
>
> You have to be fast with your feet or aim really well with your
> hammer... But I don't recommmend using a hammer. If you get it between
> the spokes you'll be flying. And I don't recommend putting your feet
> between the spokes either. You'll probably end up flying a shorter
> distance, with your foot smashing to the frame, probably get a few
> toes cut off by the spokes, smashing your chin to the ground and going
> home crying for mom.
>
> Well, you just have to be able to ride with one foot and be fast
> enough to kick the button with the other, before the pedal comes back
> up again and destroys your ankle. *


Actually, I think you just swing your heels in to tap the button on the
hub.


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daino149 wrote:
> *Actually, I think you just swing your heel in to tap the button on
> the hub.
>
> That brings up the question, can you shift it while riding? Wouldn't
> there be quite a bit of friction on the switch if you are rolling? *
Yeah how would it shift? Would you have to get off and do it like you
have to use a clutch on a car?


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It's actually quite easy on a bike. I have a Speed Drive on my
recumbent. A simple, sharp tap of the heel, especially with the Easy
Shift levers. Although, I don't think you would want to use them on a
uni.

As for shifting on a uni in motion, that would take a lot of practice.
I think the easiest method would be idling with the appropriate crank at
3 o'clock, tap, then continue riding.


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wilbert wrote:
> *So can some explain how you could tap the button to change gear with
> out killing yourself ?? *

I don't think many people are going to be shifting on the fly with that
hub. It would be extremely tricky.

I tried a bike with a Speed-Drive at the Seattle Bike Show. It worked.
I had to coast while clicking the shifter knob with my heel. You can't
coast on a unicycle (well, in the same way you coast on a bike) so
shifting on the fly will be quite tricky.

On the unicycle I think the most practical way to shift on the fly will
be to do a still stand, tap the shift knob with your heel, and then ride
away. Not exactly a true shift on the fly motion.

I'm sure some people will try and succeed in a true shifting on the fly
without stopping. Just for fun, try riding a Coker and giving the dust
cap on the crank a good strong tap with your heel as you're riding. Not
easy to do. Then after you manage to tap the shift knob you have to
deal with the sudden change in gearing. Whoa there!

For me, I view the shift mechanism on the Schlumph hub as something that
I would use after dismounting. Dismount, shift, re-mount, and ride
away. No tools necessary. Very quick and easy. Easier and more
convenient than shifting on Harper's hub. With Harper's hub you have to
remove a bolt, move the torque lever to a different position, then
replace the bolt. Not as convenient. Shifting Harper's hub is
something like a 30-60 second operation. Shifting the Schlumph hub is
something like a 1 second operation.


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You'd probably have to ride, hop and shift in mid-air, then land, and
adjust. If I'm understanding correctly. No? okay.

-Wallbanga


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john_childs wrote:
> *On the unicycle I think the most practical way to shift on the fly
> will be to do a still stand, tap the shift knob with your heel, and
> then ride away. Not exactly a true shift on the fly motion. *

Shifting on the 'dead fly', I'd call that.

With the Schlumpf geared hub, don't you have to 'nudge' the gears into a
position that they engage? That would mean that you cannot just kick
while riding, but you have to push for some (short) time untill the hub
suddenly changes gears. Or would the cogs somehow engage in any
position? Willfcc has the same hub on his bike I understand, so he may
be the best (in this group) to answer.

Klaas Bil


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Nudging won't do. It needs to be a positive, firm action. You don't
"push" the button, you "kick" it. It clicks into position, you're
there. No waiting for gears to engage.

You also have to adjust the height of the shift buttons correctly (very
easy to do). Too low, and you won't complete the shift.

If you're not firm in your shifting action, it's possible to hit
"neutral". That's only happened to me once. Disastrous on a uni.


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Dylan Wallinger wrote:
> *You'd probably have to ride, hop and shift in mid-air, then land, and
> adjust. *
That might actually work. Based on John Childs' description, it sounds
like you might need to let up on the pedal pressure to shift though,
which would make it even more challenging to do without stopping.

But if I owned one, I'm sure I would not be satisfied until I'd learned
how to do it! Probably while riding extremely slow. Then, once mastering
the technique, gradually building up to walking speed and higher.

If you had a croquet mallet or similar, it would be pretty easy to shift
while idling. Almost too easy.


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looks like a cool idea


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i guess it would be kinda nice when you want to go a little bit faster
or slower to go up a steeper hill but i still dont see how it would
work?


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