Seat twist problem

measure your tube(s) and go to a bike shop and buy a good sturdy clamp.
i recommend a solid double bolt like a primo.

--
markf

stuck in iowa and unemployed.
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put some fine dirt on it... rub it all over and that should increase the
friction on the seat post and the frame. hope that helps=)

--
manon1wheel

Riley Crosby

getting better... lvl 5 unicyclist
-.- T1me to overthrow most replies!!-.-
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Welcome to the fora.

Quoted message said:

I am fairly new to unicycling but feel I am progressing well, can
almost turn both ways, free mount and ride round the block.
Nick

That's one more of us and one less of them.
How long have you been riding?

Quoted message said:

My saddle is constantly getting twisted whilst turning and dismounting
which I have been finding very irritating.

I had the same problem and sorted it out by scuffing the surface of the
seatpost with a hacksaw.
When the seat is skew, don't just force it back into place. When you do
that, you're just 'polishing' the surfaces it skid on before. Loosen
the seat, straighten and tighten. This is easier with a quick-release
bracket.
Most 'commercial seatposts'
(http://www.unicycle.com/shopping/shopexd.asp?id=271) will have a
'textured area' to help prevent this problem.

Apart from limiting your abillity to adjust the seat-height, I can't
think of any reason why not to drop a bolt thru there. But I'm not the
most technically minded one around here, you may want to wait for
another couple of replies before you start drilling.

But considering your level of riding skill, shouldn't you be thinking
about upgrading your uni rather than worry about your seat...?

--
GILD

'three short gs and a long e-flat'
(http://w3.rz-berlin.mpg.de/cmp/beethoven_sym5_1.wav) - 'map'
(http://www.frappr.com/unicycleworld)
'\\"freedom is just chaos, with better lighting.\\" entropy'
(http://tinyurl.com/77lom)
'harper' (http://tinyurl.com/c9epx)
'NAMASTE!' (http://tinyurl.com/4qcxw)
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An often used emergency bike repair is simply to cut a narrow (inch or
two) strip from a soda can. Then, you just place this strip between the
seatpost and clamp. But this is only good if it is very severe, though
it can be used as a permanant repair.

--
snuffiluffigus

It's not that I'm lazy, it's that I just don't care.
-office space
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Quoted message said:

My saddle is constantly getting twisted whilst turning and dismounting
which I have been finding very irritating. It's a fairly inexpensive
unicycle with a separate pressed steel seat clamp.

Any ideas?

Nick

The problem is most likely due to one of a few things
-wrong inside diameter of frame (possibly due to poor manufacturing
tolerances)
-wrong outside diameter of seat post
-crappy quality quick release

In the first two cases you could try out a different seat post, just to
see if that helps.

Before doing that I suggest trying out a new clamp. I know my twisting
seat difficulties have usually been solved by upgrading to a better
quality clamp which can apply more force. You could either buy a
replacement quick release or try an allen key style seat clamp.

Another possibility is to lengthen the keyway on your frame so that the
frame can be pinched tighter by the clamp. I've done this, although
drilling a lower keyway hole is tricky as you are drilling on to a
curved surface and need to clamp things carefully. Note that doing
this requires a hacksaw, a metal drill and a happiness to mangle your
frame.

--
peter.bier

-Peter Bier
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Quoted message said:

I am fairly new to unicycling but feel I am progressing well

Welcome to the fora!

Quoted message said:

Any ideas?

I would suggest you -don't- sand or scuff your seat post, unlike others
have suggested. That makes it quite prone to rusting.

Your seat tube (that's the central tube of the frame that sticks
upwards) probably has a slit running from the top, two inches down or
so. That slit should be on the rear side. The quick release clamp's
mechanism should be on the rear side as well, so that it compresses the
slit, not the solid tube. More importantly, the quick release should be
near the top of the seat tube, so that it can compress the slit.
Lastly, most quick release clamps can be 'pre-tightened' with a little
nut or round thing on the opposite end of where the lever is. If that
is too loose, you won't be able to clamp tight enough with the lever.

Klaas Bil (posting from the forum, my news server seems broken)

--
Klaas Bil
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oh. one more thing to try. take an old biek tube and cut a little piece
from that and use it to shim up the space involved. even a thin piece
of rubber that doesn't go all the way around the seatpost should be
more than enough.

--
markf

stuck in iowa and unemployed.
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Thanks for your ideas everyone!

I've got a few ideas to try out!!

I know that my neighbour's uni has a knurled seatpost and he doesn't
have the seat twist problem!

Or perhaps it's my technique?!

I do have a QR on it, but think that it is perhaps not as essential as
it is on my MTB.

I like the shim idea and I will also try to find a double BMX style
clamp and failing that perhaps try some of the more drastic methods!

I have been riding for around a year now, but have only just started to
really progress with regular practise! It's quite a satisfying thing to
learn and I am hoping that it will help my mountain biking skills.
There is also a wealth of new things to try which I like! I'm most
pleased with being able to freemount and seem to be achieving this more
regulary now.

Thanks again!

Nick