Various Unicycle questions.

I recently recieved my brand new Semcycle XL, and it is great. Much lighter than
the uni I learnt to ride on, which was made of lead I think :slight_smile:

I now have a few questions about it though.

First It has a small end on the valve (An english style I think), I bought an
adapter so can now pump it up but the guy at the bike shop says they don’t make
pressure guages for the small valve. Can anyone help with this? So far I am just
pumping it up until it does not flatten while I’m on it. Is this enough?

Also I have noticed that while riding I am twisted with my left shoulder out in
front, and the right shoulder out back. This did not happen on the uni I learnt
on. Any ideas what causes this? If I try and straighten up I ride of to the
right and crash into a gutter :slight_smile:

Thanks for any help, Chris.

Re: Various Unicycle questions.

In a message dated 95-10-29 18:38:02 EST, you write:

>First It has a small end on the valve (An english style I think), I bought
an
>adapter so can now pump it up but the guy at the bike shop says they don’t make
>pressure guages for the small valve. Can anyone help with this? So far I am
>just pumping it up until it does not flatten while I’m on it. Is this enough?

I recommend a different bike shop. Presta valves, the kind that your unicycle
has, are used widely all over the world, and there are of course pressure guages
for them. If your bike shop is dippy enough not to know this, shop elsewhere.
The general rule is to pump your tire until it is hard. How hard? While riding
it on a hard surface, it should slightly flat while you sit on it, but not flat
enough to make turning difficult. That’s a very general description.

>Also I have noticed that while riding I am twisted with my left shoulder out in
>front, and the right shoulder out back. This did not happen on the uni I learnt
>on. Any ideas what causes this? If I try and straighten up I ride of to the
>right and crash into a gutter :slight_smile:

Check the alignment of the unicycle’s parts. It’s possible that the wheel is a
little crooked or off to one side, causing the uni to pull to one side. More
likely than this, it is probably you. The gutter you are riding next to suggests
that the road has a good crown to it, so the part you are riding on is angled
downward toward the gutter. Try riding in some parking lots, or on the other
side of a (non-busy) street. I think your problem is related to the riding
surface. I remember having this problem in my early days of riding, but riding
in the center of the road that was giving me problems cleared things up.

Stay on Top! John Foss, the Uni-Cyclone unicycle@aol.com

Re: Various Unicycle questions.

Chris Fiddyment (cxf@itd.dsto.gov.au) wrote:

: First It has a small end on the valve (An english style I think), I bought
: an adapter so can now pump it up but the guy at the bike shop says they
: don’t make pressure guages for the small valve. Can anyone help with this?
: So far I am just pumping it up until it does not flatten while I’m on it. Is
: this enough?

(Writing from England) If it’s a small end, without a lock-nut or plunger of any
sort it’s a ‘Woods’ valve. These are typically used on kids bikes, but are
becoming increasingly rare. There are no pressure guages because there is no way
to force the valve to release and let out some pressure to be guaged. It has a
collar round it, which will unscrew and let the whole valve body out.

If the small end has a fine spindle with a little locknut it’s a Presta, for
which pressure guages do exist. Of course, I don’t know what the ‘standard’
valves/guages are in Australia, but they are freely available in the UK (most
road racing/touring bikes use them).

Car type valves (wide body, recessed plunger) are Schraeder.

In piccies (screw threads omitted ! ;-))

     ____ X <-Locknut --
    |    |             | <-Spindle ||
    |    |             M ----
    |    |            | |             |    | <- Collar
    |    |            | |              ----
    |    |            | |              |  |
    |    |            | |              |  |

                         Schraeder Presta Woods
                      (locknut shown fully undone)

If you do have a Woods, I’d replace it (ie, new inner tube required).

First, you won’t need an adaptor (you’ve bought one already- but it will still
be more convenient to be able to do without it). Secondly (most important), the
internal construction is often a bit dubious- sleeves of rubber stretched over
little holes and the like- and Woods valves often leak and are generally a pain
(and they don’t age well- the rubber hardens up a bit). They particularly don’t
like high pressures, which leads on to …

I don’t guage the pressure in my tyre, I just pump it up as hard as I can be
bothered to. This is typically (having said I don’t guage it ;-)) around 80 psi,
which is twice what the tyre specifies. I feel I have more control (less
squirming) with a hard tyre.

regards, Ian Smith