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Old 2017-05-12, 03:21 PM   #1
Barnstar
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Seat post length + introducing myself!

Hi all,

I have been trying to learn how to unicycle in earnest for the last couple of months, after dipping my toe in the water briefly last year before the winter set in. I am at the stage where I can wobble for a hundred foot or more on most attempts, and as my legs have started killing me, and in an effort to make me sit down more, I have been raising the saddle a lot recently.

When I first got my 24" Club Muni I cut the seat post down a bit, not realising that as I gained in confidence I would be increasing the height of the saddle so much!

My question is, how much seat post do you think you need in the frame before it becomes unsafe? I think it is okay at the moment, but I just seem to keep on raising it!

Thanks
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Old 2017-05-12, 04:54 PM   #2
Regina Wrecks
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I just checked my 24' Muni, the same model as yours, I fitted a longer seat post last year, but at the moment, after cutting it down a mite last year, I have about 4" inside the frame tube. I suspect roughly 3" is the minimum required, but others may well be more expert......
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Old 2017-05-12, 05:54 PM   #3
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Quote:
Originally Posted by Barnstar View Post
I am at the stage where I can wobble for a hundred foot or more on most attempts
Congratulations! You are a unicyclist.

Quote:
my legs have started killing me, and in an effort to make me sit down more, I have been raising the saddle a lot recently.
Been there, created a thread on that:

http://unicyclist.com/forums/showthread.php?t=118140

It does get better - seat height is important, but a lot of it is just practice learning to give the wheel only what it needs, with no wasted leg effort. Soon the only leg stress is pushing up hills, retarding down them, and occasionally partly standing for a few revolutions to relieve saddle pressure.

Club seatposts are cheap, problem is shipping will double the cost. Next time you have cause to order something it's worth getting a spare. Also keep an eye on craiglist or other local classified for additional unicycles - you can never have too many :-)
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Old 2017-05-12, 06:55 PM   #4
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If manufacturers "minimum insertion" lines are to be believed you should have 100mm/4" of post in the frame, but I think you are safe with about half that, as long as it goes deeper than the slot cut for the seatpost clamp.
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Old 2017-05-12, 07:11 PM   #5
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As a bare minimum, I'd say about 50mm (2", which is about double the height of a typical seat clamp), but for any kind of long term use I'd want to go double that, if possible. It's less of a big deal if you don't think you will ever fall on the unicycle, or subject it to similar side-force impacts that might damage (or break) your seat tube.

Yes, when learning, having the seat as high as possible will help your legs to not overdo it. The basic rule for this is that if you're sitting on the seat with one pedal at the bottom, and your foot centered on that pedal, you should still have a little bit of bend in your knee but not much. Then ride with the balls of your feet on the pedals to get the maximum benefit of your ankle power.
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Old 2017-05-13, 12:58 PM   #6
Barnstar
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Thanks for your replies, I tried saying thanks yesterday but the post never appeared.

Does every post have to be checked by a moderator, or is it just because I am new here?
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Old 2017-05-13, 01:03 PM   #7
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Thanks for your replies, I tried saying thanks yesterday but the post never appeared.

Does every post have to be checked by a moderator, or is it just because I am new here?
Neither. You probably clicked the wrong button.
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Old 2017-05-13, 01:04 PM   #8
Barnstar
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Nevermind, it must have been because I was new as the above post appeared instantly!

I went out again today to practice, but could only manage half an hour and it was clear that my body was not as willing as my mind! I am going to have to leave at least a day or two gap in between sessions or my body just can't handle it. I have found it quite surprising as I cycles thousands of miles a year commuting to work. I know I know, it just takes time!
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Old 2017-05-13, 01:26 PM   #9
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Quote:
Originally Posted by johnfoss View Post
As a bare minimum, I'd say about 50mm (2", which is about double the height of a typical seat clamp), but for any kind of long term use I'd want to go double that, if possible. It's less of a big deal if you don't think you will ever fall on the unicycle, or subject it to similar side-force impacts that might damage (or break) your seat tube.
The longer the insertion of a seat post into the seat tube the further down the seat tube the load is applied. However this is surely only where the post fits fairly precisely inside the tube?

Many seat tubes are flared immediately below the clamp to increasing their diameter. As such, insertion beyond the flare, per se, is surely irrelevant? The determining factor for minimum insertion would seem the length of post below the clamp such that the pressure of the clamp does not significantly deform the post due to the proximity of its end.

Perhaps Engineer could calculate how far that would be, or suggest other mechanical constraints? My initial guess would be a diameter of the seat post past the bottom of the clamp.
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Old 2017-05-13, 02:43 PM   #10
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Sorry, not my field of engineering. My gut feeling is you'd have to consider the flex in the materials as well as the geometry, but I'll leave analyzing it to someone who took the course where you were handed a piece of uncooked linguini and tasked with determining its utility as a bridge girder... without breaking it.

I did finally bring myself to cut off the part of the seatpost on my 36er that would be out of contact within the flared part of the seat tube anyway, in order to experiment with slightly lower seat positions (ended up dropping it about a centimeter from where I started) and accessories mounting through the hole there.
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