Semcycle XL 2 and 3 wheelers

Semcycle XL 2 and 3 wheelers

Post by booge » Wed, 23 Jan 2002 05:25:07


I just purchased the Semcycle xl 2 and 3 wheeler and while riding with
all 3 wheels i have found that the tires slip on each other and i dont
know if this is because of the rain (it has been raining or snowing
just about every day I have gotten it out) or if i do not have all the
tires inflated properly. In order for the 3 wheels to be attached (and
not be riding on the rim of the bottom wheel) you have to let a good
bit of air out of the top 2 wheels. After assembling the uni should i
pump the top two tires some more to get better traction between them
all or will this put too much stress on the frame? Has anyone put MTN
bike tires on each wheel to get even better traction between them?
Also, although my neighbors love to watch me attempt (and fail) to ride
the 2 wheeled uni (peddling backwards and going forwards is a great
challenge) any words of advice for riding the 2 wheels would be greatly
appreciated. Thanks! Booger

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Semcycle XL 2 and 3 wheelers

Post by Klaas B » Wed, 23 Jan 2002 07:59:25

Re the slipping of wheels, I discussed this some time ago with someone
from Semcycle (for a two-wheeler). Actually, there was an additional
issue of lateral movement to the extent that the tires would run off
each other. He recommended in general that the bottom tyre be pumped
quite hard (as it takes your weight), and the top tyre not harder than
needed to prevent slip. That way, the top tyre would fold slightly
around the bottom tyre, and also the top tyre would be more flexible
to absorb and "correct" some lateral slip without accumulating in too
much sideways movement and consequent run-off.
I would think that the frame is designed to take vertical stresses
easily.

Jorga has the two-wheeler almost down. I have only one word of advice:
"practice". Jorga rode along a wall rack for hours, then holding two
persons, then one, now a half (i.e. one but very loosely).

Klaas Bil

On Mon, 21 Jan 2002 20:25:07 +0000 (UTC), booger

Quote:

>I just purchased the Semcycle xl 2 and 3 wheeler and while riding with
>all 3 wheels i have found that the tires slip on each other and i dont
>know if this is because of the rain (it has been raining or snowing
>just about every day I have gotten it out) or if i do not have all the
>tires inflated properly. In order for the 3 wheels to be attached (and
>not be riding on the rim of the bottom wheel) you have to let a good
>bit of air out of the top 2 wheels. After assembling the uni should i
>pump the top two tires some more to get better traction between them
>all or will this put too much stress on the frame? Has anyone put MTN
>bike tires on each wheel to get even better traction between them?
>Also, although my neighbors love to watch me attempt (and fail) to ride
>the 2 wheeled uni (peddling backwards and going forwards is a great
>challenge) any words of advice for riding the 2 wheels would be greatly
>appreciated. Thanks! Booger

>--
>booger
>Posted via the Unicyclist Community - http://unicyclist.com/forums

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Semcycle XL 2 and 3 wheelers

Post by Gilb » Wed, 23 Jan 2002 13:25:10

Yes, you should add air into the top tire(s) once it's assembled. When I
assemble my 2-wheeler, I deflate the tires all the way and squeeze the
tires together and tighten them down. However, with the Semcycle
multi-wheeler, there isn't any way to adjudst this. Then you fill up the
bottom tire to the desired pressure like what you'd have in your regular
uni. The top tire is then filled to adjust the pressure between the
tire. You don't want much air in the second tire up. If you have a third
tire, then you'll want to have this one be the same pressure as the
bottom one so that the pressure is the same between the middle and
bottom tires as it is between the middle and top tires.

I have never ridden a Semcycle 2-wheeler that has had the proper
traction between the tires. this is mainly due to it's design and how
you can't adjust the distance between the wheels. However, there is an
option to change to a fatter tire, such as the 1.85" or 2.1" Primo "the
wall" tire ( http://www.unicycle.com/shopping/shopaff.asp?affid=4&url=/-
shopping/shopexd.asp?id=299).

I've tried a knobby tire before and it wasn't any better for traction
between the tires, but was mostly just a bumpier ride.

  > After assembling the uni should i pump the top two tires some more to
  > get better traction between them all or will this put too much stress on
  > the frame?

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Semcycle XL 2 and 3 wheelers

Post by booge » Thu, 24 Jan 2002 06:55:16

Klaas Bil and Gilby, Thanks for the tips, I'll let you know how i do!

booger

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Semcycle XL 2 and 3 wheelers

Post by Klaas B » Thu, 24 Jan 2002 08:10:17

On Tue, 22 Jan 2002 04:25:10 +0000 (UTC), Gilby

Quote:

>If you have a third
>tire, then you'll want to have this one be the same pressure as the
>bottom one so that the pressure is the same between the middle and
>bottom tires as it is between the middle and top tires.

Why should the middle tyre have to feel the same pressure on both
sides? The bottom tyre doesn't experience that, generally, and the top
tyre certainly doesn't.

Klaas Bil
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Semcycle XL 2 and 3 wheelers

Post by Kevin Gilbertso » Thu, 24 Jan 2002 08:32:14

Quote:

> Why should the middle tyre have to feel the same pressure on both
> sides? The bottom tyre doesn't experience that, generally, and the top
> tyre certainly doesn't.

It doesn't *have* to be, but in order to get the same traction between
the top and middle tires as the bottom and middle tires, then you need
same pressure on both sides. It's not about getting the same pressure,
just the same traction between the tires, and in order to do that, you
need the same pressure in the top and bottom tires.

- Gilby