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New KH Hub, defective??



 
 
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  #61  
Old September 6th 07, 02:21 PM posted to rec.sport.unicycling
UAC
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Posts: 33
Default New KH Hub, defective??


Chrashing wrote:
The way I observed the problem was to remove one crank and put it back
on aligned with other crank, (like a kangaroo cycle). Then rotate the
wheel to line a crank up with the frame fork. The other crank should
then be in line with the fork as well. See if there is a difference.

I have felt this wheel from day one (july) seemed harder to idle on, it
took some practice for me to learn ride backwards again on. It's the
same size wheel I replaced. I did go from from 160 cotterless to 165
splined, but had used 170 cranks in the pass, and found longer cranks
easy to idle with.

As an experiment this morning, I purposly offset one crank one spline
from it's normal posistion and tried to ride the unicycle. It felt
impossible to ride. Being one spline off is much much more than the
alignment problem, but it does demonsrate sensitivity.




Chrashing,

Rotating the cranks one spline will get them out of alignment with much
more than the current defect does! I believe that 1/4" is too small to
make a too much of a difference! You may find idling more difficult due
to other changes in your setup. Have you changed other parameters
besides cranks and hub? The splined cranks and hub are maybe heavier
than your previous rig. Moreover the tire brand/model and its pressure
has a major impact on riding/idling.

I, personally, consider that once one mastered idling he should not
have problems with such slight changes in the hardware However, I
don't say this to excuse the amateurish error that the engineers did!

Finally I think all cranks that are miss-aligned share the same amount
of error if they come from the same setup of the manufacturing jig...
-----------------------
By the way, not long ago I saw a thread where some people discussed
about riding a unicycle with both cranks in the same direction
(kangaroo style). I tried this for the first time this weekend and
managed to idle 1 footed right from the first try and with both feet on
pedals in about 5 minutes. In 10 minutes I was riding more than 100m
with both feet...cool feeling
Oh - I did this on my 2007 KH20!

Flaviu


--
UAC

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(Saint Augustine)
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  #62  
Old September 6th 07, 02:54 PM posted to rec.sport.unicycling
Chrashing
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Posts: 486
Default New KH Hub, defective??


Since my last post I went down and put together my old trusty Nimbus
Muni with the cotterless cranks. (Had it boxed, ready mail to my sister
in Chicago) Checked to see how well aligned those cranks are and they
are perfectly aligned.

Between the KH and the Nimbus the tires are the same size, same seat,
160 vs 165 cranks, steel vs aluminum frame.

So then alternated riding between both the slightly mis-aligned splined
and the true cotterless. Honestly, I did not find a significant
difference between my idling and backward skills between the two
unicycles. (I seem to still suck a bit at both.)

So now it's not clear that there is a problem. I still feel that the
splined had a bit of a learning curve to it that was surpizing since I
was accustom to the similar wheel size and setup. I had often changed
crank size. Maybe I've learned to compensate for the mis-alignment, or
maybe it's just not a significant difference.


--
Chrashing

Regards,
Ken ... I say it's a great exercise. They say it's a mid-life thing.
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  #63  
Old September 6th 07, 03:15 PM posted to rec.sport.unicycling
Joe2005
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Posts: 351
Default New KH Hub, defective??


Borgschulze wrote:
What's your source for it? I might be interested in that nice looking
tubing if they sell it in 4130 CrMo.



http://tinyurl.com/l5adh

I don't know if thats his source but you can get it there.


--
Joe2005

nobody knows what happened to that boy after that.-Nutcracker

i know. he was kidnapped by aliens, learnt their ways, stole the
biggest ship he could, travelled back in time by mistake and crashed
the plane on the earth surface. he was the one who killed the
dinosaurs. -ivan
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  #64  
Old September 6th 07, 04:26 PM posted to rec.sport.unicycling
Borgschulze
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Default New KH Hub, defective??


Joe2005 wrote:
http://tinyurl.com/l5adh

I don't know if thats his source but you can get it there.



Yeah, he PM'd me...

Most of that tubing is nearly twice the price I can find it locally, IF
they have it in stock.


--
Borgschulze

'deviantART'
(http://borgschulze.deviantart.com/)'Gravity'
(http://videos.observedtrials.net/Gravity.wmv) is -not- the
issue.
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  #65  
Old September 6th 07, 04:29 PM posted to rec.sport.unicycling
Joe2005
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Posts: 351
Default New KH Hub, defective??


I'm a lucky ******* because I live next to Boeing, which means that we
have the yard, which means you can buy a whole bunch of scrap material
pretty cheap.


--
Joe2005

nobody knows what happened to that boy after that.-Nutcracker

i know. he was kidnapped by aliens, learnt their ways, stole the
biggest ship he could, travelled back in time by mistake and crashed
the plane on the earth surface. he was the one who killed the
dinosaurs. -ivan
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  #66  
Old September 6th 07, 06:54 PM posted to rec.sport.unicycling
Borgschulze
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Default New KH Hub, defective??


Joe2005 wrote:
I'm a lucky ******* because I live next to Boeing, which means that we
have the yard, which means you can buy a whole bunch of scrap material
pretty cheap.



Hamilton is also known as Steel City, we have I believe Canada's
largest steel mill.


--
Borgschulze

'deviantART'
(http://borgschulze.deviantart.com/)'Gravity'
(http://videos.observedtrials.net/Gravity.wmv) is -not- the
issue.
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  #67  
Old September 6th 07, 06:56 PM posted to rec.sport.unicycling
Joe2005
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Posts: 351
Default New KH Hub, defective??


Thats awsome man. So do you like sneak around and steal random pices of
scrap?


--
Joe2005

nobody knows what happened to that boy after that.-Nutcracker

i know. he was kidnapped by aliens, learnt their ways, stole the
biggest ship he could, travelled back in time by mistake and crashed
the plane on the earth surface. he was the one who killed the
dinosaurs. -ivan
------------------------------------------------------------------------
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  #68  
Old September 6th 07, 07:04 PM posted to rec.sport.unicycling
Borgschulze
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Posts: 1,547
Default New KH Hub, defective??


Joe2005 wrote:
Thats awsome man. So do you like sneak around and steal random pices of
scrap?



Nope, it's all fenced in.

My local metal shops are pretty cheap though.

Square tubing on that website... cheapest 3/4x3/4 is $4.35 PER FOOT in
USD....

My metal shop.. 3/4x3/4 0.083 Wall is... $1 per foot... in CAD.


--
Borgschulze

'deviantART'
(http://borgschulze.deviantart.com/)'Gravity'
(http://videos.observedtrials.net/Gravity.wmv) is -not- the
issue.
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  #69  
Old September 7th 07, 02:56 AM posted to rec.sport.unicycling
feel the light
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Posts: 810
Default New KH Hub, defective??


I think he came up with the best method, assuming you have a puller. I
spun one side around, and then could check it with a straight edge
across the cranks flat side to the frame on each side. I got my 20 from
A E Bike last May. Unlike Wickedbob, they sent me a lucky box. Try as I
might I could find no difference between the sides. Mine are accurate
to within less then a mm.
A real fast way to check, that would spot a large error, is to line
the upper crank with the frame. Stand over the uni like you are getting
ready to ride. With
one crank lined with the frame, sight down the frame on the other side,
to see if the pedal looks centered. If it looks off, it is.
I like Chrashings method best. Very precise.
So I feel a little bad, like I'm gloating ! Mines ok! At least we
know they aren't all off. I hope this turns out to be a false alarm for
most of the rest of you as well.
It's quite possible Kris doesn't know what's wrong yet, he needs
someone to send him an off set. In all likelihood it is just one side
that was mis machined, so once he knows what side it is, only one new
arm should be needed.


--
feel the light
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  #70  
Old September 7th 07, 07:32 PM posted to rec.sport.unicycling
a48724
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Posts: 1
Default New KH Hub, defective??


Personally, I think the easiest or most accurate way to check this on a
built wheel, is to remove ONE crank and BOTH pedals... .Now put the
(removed crank) back on the hub, opposite the other crank; the two
holes of the cranks should be in line. Now take a long peg/pole/bar/rod
(preferably the same size as the holes, and stick it through both holes
(as a result also through the spokes); now turn your wheel until the
peg/pole/bar/rod gets stuck against the fork/tubes; the
peg/pole/bar/rod should hit the fork on both sides simultaneously;
otherwise the cranks are misaligned....
I've tested it with my double-hole KH cranks (KH 24 is 3 weeks old!!!);
same problem over here. I'm pretty sure it's caused by the HUB as I've
just received BRAND NEW Cranks (ordered and received after the reported
problems) and the misalignment remains...

Another Michie


UAC wrote:
It should be not so difficult to tell if the cranks are miss-aligned
even in case of a built wheel!
1. Find two flat topped chairs of the same height
2. Remove the wheel-set from the frame
3. Remove on of the cranks and put it in line with the other
4. Place the chairs one next to the other on a flat surface leaving a
gap between them...place the wheel on the cranks in between the chairs
5. Take a conclusion...

I have all 3 KHs with Moment hubs. After seeing this thread I was
curious to check mine. Right from the first attentive glances I found
out the same problem on my KH20 and KH24 On my KH29 I have the
double-hole cranks but not checked 'em yet. For me now only eye
inspecting is enough to tell...

I never noticed this issue until now...and can tell that it should not
affect riding at all. However it's sad this problem survived to this
extent! Lately, I'm not surprised such things happen...

It's not the designer's fault but the manufacturer's...they have to
grow up!

Flaviu



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