Has anyone ever tried to make crank arms that are adjustable in length?
They’d have to be a pretty beefy design.
A corollary to this may be how the peddles are attached to the crank arm.
Maybe they could slide in some sort of slot. You’d sure have to watch that
nothing caught on the ends of the cranks that were exposed when the
peddles were retracted in. Again the design would have to be beefed up.
Christopher Grove
–
“Be Bold and mighty forces will come to your aid.” -Basil King (Anyone who
can give me more info on THIS Basil King please email
me.)
My short story at: http://www.rosedog.com/manuscript.asp?m=9389256&manusc-
ript=6862016&t=The+Determination+of+Jeffery&fn=Christopher&ln=Grove&srdt=-
9%2F27%2F01+5%3A32%3A05+AM&fs=2&ff=Arial%2C+Helvetica%2C+Verdana&ps=4000&-
s=735143750&folder=Search+Results
Another way to achieve the effect of adjustable length cranks (though
literally the length would not change) is to tap more than on thread
in the cranks for the pedals to be screwed in. Don’t know if it has
been done.
Klaas Bil
On Sat, 27 Oct 2001 02:49:07 GMT, Christopher Grove
<c_r_grove@yahoo.com> wrote:
>Has anyone ever tried to make crank arms that are adjustable in length? >They’d have to be a pretty beefy design. > >A corollary to this may be how the peddles are attached to the crank arm. >Maybe they could slide in some sort of slot. You’d sure have to watch >that nothing caught on the ends of the cranks that were exposed when the >peddles were retracted in. Again the design would have to be beefed up. > >Christopher Grove > >– >“Be Bold and mighty forces will come to your aid.” -Basil King (Anyone >who can give me more info on THIS Basil King please email >me.) > >My short story at: http://www.rosedog.com/manuscript.asp?m=9389256&manus- >cript=6862016&t=The+Determination+of+Jeffery&fn=Christopher&ln=Grove&srd- >t=9%2F27%2F01+5%3A32%3A05+AM&fs=2&ff=Arial%2C+Helvetica%2C+Verdana&ps=40- >00&s=735143750&folder=Search+Results
–
“To trigger/fool/saturate/overload Echelon, the following has been picked
automagically from a database:” “North Korea, crack, Cuba”
I had considered making a set of cranks that did just that. Upon further
consideration I decided that the cranks would be too severely weakened (or
too heavy) to use the “long” setting. Of course I’m no engineer, so maybe
cranks could be designed in such a way without compromising their strength
and durability.
-mg
“Klaas Bil” <klaasbil_remove_the_spamkiller_@xs4all.nl> wrote in message news:3bdb29ac.3321350@newszilla.xs4all.nl… > Another way to achieve the effect of adjustable length cranks (though > literally the length would not change) is to tap more than on thread > in the cranks for the pedals to be screwed in. Don’t know if it has > been done. > > Klaas Bil > > On Sat, 27 Oct 2001 02:49:07 GMT, Christopher Grove > <c_r_grove@yahoo.com> wrote: > > >Has anyone ever tried to make crank arms that are adjustable in length? > >They’d have to be a pretty beefy design. > > > >A corollary to this may be how the peddles are attached to the crank > >arm. Maybe they could slide in some sort of slot. You’d sure have to > >watch that nothing caught on the ends of the cranks that were exposed > >when the peddles were retracted in. Again the design would have to be > >beefed up. > > > >Christopher Grove > > > >– > >“Be Bold and mighty forces will come to your aid.” -Basil King (Anyone > >who can give me more info on THIS Basil King please email > >me.) > > > >My short story at: > >http://www.rosedog.com/manuscript.asp?m=9389256&manuscript=6862016- >&t=The+De
termination+of+Jeffery&fn=Christopher&ln=Grove&srdt=9%2F27%2F01+5%3A32%3A-
05+ AM&fs=2&ff=Arial%2C+Helvetica%2C+Verdana&ps=4000&s=735143750&folder=S-
earch+R esults > > – > "To trigger/fool/saturate/overload Echelon, the following has > been picked
automagically from a database:" > “North Korea, crack, Cuba”
These types of cranks have been used on unicycles. But I can’t remember
who has tried them.
Just be careful that the part sticking up above the pedal doesn’t snag a
shoelace…
john_childs
>From: klaasbil_remove_the_spamkiller_@xs4all.nl (Klaas Bil) > >Another way to achieve the effect of adjustable length cranks (though >literally the length would not change) is to tap more than on thread >in the cranks for the pedals to be screwed in. Don’t know if it has >been done. > >Klaas Bil >
Hey all. My QBP catalog has crank arm shorteners listed with the tandem
parts. Part number CR8870 “Ride2, threads into crankarms and provides four
pedal positions shortened by 24, 41, 59, and 76mm, cams tighten unit
against crank arms, 308 grams per pair.” Joe in Iowa >> >> >Has anyone ever tried to make crank arms that are adjustable in >> >length? They’d have to be a pretty beefy design
> Has anyone ever tried to make crank arms that are adjustable in length? > They’d have to be a pretty beefy design.
Which would you be willing to put up with, double the weight, or weaker
cranks? You could probably have one or the other, and at least double the
price of regular cranks.
Being able to adjust length in the field would be really nice (for MUni in
my case), but I wouldn’t want to sacrifice strength for this ability. So I
pick a size before the ride, and live with it.
I’ve seen pictures of various types of adjustable crank; some from 100
years ago. But all of them looked both heavy and weak (and obviously would
be expensive). I’d settle in the short term for a wider selection of
quality cranks that are appropriate to today’s unicycles.
An old chap near me has some on his high wheeler. When he bought it one of the cranks was wrecked so he had another one made locally.
The pedals have modified axles (apparently still available) they have a longer thread with a bolt that goes the other side of a slot in the crank.
I have yet to go round to his place to try them out and/or take photos…
