About 15 years ago I made a conversion kit for a standard unicycle to a
giraffe. Basically it was a seatpost but where the seat would have
normally been there was a bottom bracket welded to it. It then continued
up with the standard seat tube and seat. I cut the arm of a right crank
arm leaving just the sprocket and used that in place of the right crank on
the standard uni. Then up above I used standard bicyle cranks.
Has anyone seen this done before, is there any particular reason that this
is a bad/good idea? If I were to produce these in quantity would anyone be
interested?
Sorry, but I’ve long since discarded the device. I made it in metalshop
class when I was a teenager.
If I had to guess at a price (keep in mind this is a pretty wild guess)
I’d say that they could be sold for around $50(US). That is, of course, if
the idea is even worth pursuing.
The big question in my mind (I wish I hadn’t thown the thing out!) is
whether the chain has to angle too far out since the chain runs on the
outside of the frame. There is also the problem of how to tension the
chain. On the one I made I simply extended the “seat post” portion of the
extension until the chain was tight. Unfortunately, as I would ride, the
thing had a tendency to twist and slip which really messed up the chain.
This twisting/slipping would not be a problem on a Schwinn/Semcycle but
some other chain tensioning method would be needed (eccentric bottom
bracket like is used on a tandem?).
I do recall that for me it worked reasonably well stuck into the seat tube
of a second hand 20".
>About 15 years ago I made a conversion kit for a standard unicycle to a >giraffe. Basically it was a seatpost but where the seat would have >normally been there was a bottom bracket welded to it. It then continued >up with the standard seat tube and seat. I cut the arm of a right crank >arm leaving just the sprocket and used that in place of the right crank >on the standard uni. Then up above I used standard bicyle cranks. > >Has anyone seen this done before, is there any particular reason that >this is a bad/good idea? If I were to produce these in quantity would >anyone be interested? > >-mg > >
–
“To trigger/fool/saturate/overload Echelon, the following has been picked
automagically from a database:” “Kabul, Al Qaeda, Iraq”
I don’t think it would be better. Hopefully just as good and less
expensive. (and more compact).
-mg “Klaas Bil” <klaasbil_remove_the_spamkiller_@xs4all.nl> wrote in
message news:3bd0a8db.7487036@newszilla.xs4all.nl… > Would there be any reason for such a conversion giraffe to be better > than an original one? Or would be be cheaper? > > Klaas Bil > > On 18 Oct 2001 20:41:29 GMT, “Michael Grant” > <michael_j_grant@yahoo.com> wrote: > > >About 15 years ago I made a conversion kit for a standard unicycle to a > >giraffe. Basically it was a seatpost but where the seat would have
normally > >been there was a bottom bracket welded to it. It then continued up with
the > >standard seat tube and seat. I cut the arm of a right crank arm leaving > >just the sprocket and used that in place of the right crank on the
standard > >uni. Then up above I used standard bicyle cranks. > > > >Has anyone seen this done before, is there any particular reason that
this > >is a bad/good idea? If I were to produce these in quantity would anyone
be > >interested? > > > >-mg > > > > > > – > "To trigger/fool/saturate/overload Echelon, the following has > been picked
automagically from a database:" > “Kabul, Al Qaeda, Iraq”