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Extended seat post - is that a thing?

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Extended seat post - is that a thing?

Old 05-16-17, 09:13 AM
  #1  
jacoby75
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Extended seat post - is that a thing?

Hey guys,


I'm new to the forum and am looking for any help you might be able to offer. I have an Electra Townie that I have owned for several years, but I have always found it challenging to ride. I think I may benefit from an extended seat post, because I'm an abnormally large fella. I'm 6'6", 400lbs, give or take. The factory seat post has held up just fine to my weight, but I could use more height and I don't know how to get it. I haven't found any aftermarket extended seat post options online. I have thought about getting the measurements and seeing if Home Depot sells pipe in a similar dimension and cutting something to size, but I don't know if that's realistic, and/or if it would hold my weight.


Any thoughts?


Thanks
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Old 05-16-17, 09:25 AM
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The seat tube angle on a townie is so slack, if you buy a long mountain bike seat post that fits in the tube, you may not be able to reach the handlebars. At a minimum the reach will be greatly affected.
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Old 05-16-17, 09:28 AM
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Thanks for the quick feedback. I see what you're saying. I don't really know how much extra height I'd need. 3-4"? I wonder if there's a way to raise the height on the handlebars too, or would I have to just buy taller handlebars? Sorry if it's a stupid question. I'm not a cyclist, per se, hence my 400lbs. Just a guy who cruises the neighborhood with the family.
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Old 05-16-17, 09:34 AM
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Re Pipe, Once you stick out a long length of seat post, It Better Be Strong !


I bodged up a Single speed with an old Schwinn Mesa Runner,, Found: soft steel Wald 1" seat posts bend,
but getting a Chromoly , 4130 steel, seat post it was fine.. [I (200#) had 12" out of the frame]

A simple tube seat post has 2 diameters , at the tip its 7/8" (22.2mm) for the saddle clip
the rest is matching the interior diameter of your frame's seat tube, which I cannot even hope to guess.

And there are various ways to raise your stem, a "stem raiser" is what its called , there is also fitting a different stem
which either has a long vertical shaft, or rises up steeply , at say a 45 degree angle.

Your neighborhood bike shop may be able to show you some options. they can get, even if not in stock when you walk in.




.....

Last edited by fietsbob; 05-16-17 at 09:42 AM.
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Old 05-16-17, 09:38 AM
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Originally Posted by fietsbob View Post
I bodged up a Single speed with an old Schwinn Mesa Runner,, soft steel Wald 1" seat posts bend, but getting a Chromoly , 4130 steel, seat post it was fine.


I have no idea what any of that means. LOL. Might as well be speaking German. But yes, strong pipe would be quite important. I doubt anyone has bought Home Depot plumbing pipe for that specific purpose. Only one way to find out, I suppose. But if I'm wrong, the results would be quite painful.
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Old 05-16-17, 09:39 AM
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Buy the best seat post you can because your weight will be an issue of the slack angle but I think it can be done. The stem is a quill stem which you can raise or lower and you can angle the bars in if need be.

Take out the original seat post and it will most likely have a stamp stating the size. If not take it to your local bike shop and have them measure it. The pipe and rod from HD most likely won't work because seat posts and seat tubes have to match in diameter so it doesn't slip etc. Every seat post as a maximum level don't go past that.
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Old 05-16-17, 09:53 AM
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Unfortunately, I simply think you have a bike that's too small for you, and at your height, that may be an inevitability. With that said though, the townie is one of the worst bikes you can try to extend the seatpost on because of the very shallow angle of the seat tube (where the seatpost goes in). Just look at the physics behind it. Since the seat post comes out at such an angle, compared to an old mountain bike, MUCH MORE of your weight is being supported by material tension instead of compression. Now, I'm no engineer, but if I had to guess, I'd say that steel tubing has better compression properties than tension properties. (A quick google says steel is equally strong in both, but that's not for tubing, and tubing is different.)

In practice, I know what I say above is true. It's MUCH... MUCH easier to bend a piece of stainless tubing than it is to buckle it along the axial dimension. I can bend a small piece of tubing by hand, but there's no way I'm crushing it along its axial dimension without putting a hole through my hand.

Last edited by corrado33; 05-16-17 at 09:59 AM.
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Old 05-16-17, 10:02 AM
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You can get longer seatposts. Every seatpost has a line on it that shows how far is must be inserted. You can see it here about 1/4 up from the bottom:



First see if your existing seatpost is long enough by pulling it up until that line is just inside the seat tube. If it's not long enough, measure the usable length of the post (from that line to the top of the post). Then guesstimate how much longer post you need. When you're shopping for a new post you need to get one that has the useable length you guesstimated and is the same diameter as your current post (common diameters are 27.2mm, 30.9, 31.6mm).

When you install the new seatpost spend a while adjusting the height and the angle of the seat. Read up on how to get the right height and angle. Adjust just a little at a time homing in on a height and angle that feels right.
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Old 05-16-17, 10:32 AM
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Originally Posted by corrado33 View Post
Unfortunately, I simply think you have a bike that's too small for you, and at your height, that may be an inevitability.
Yes, unfortunately, the bike is just one more thing that is engineered for an average sized person and is too small for me. Add it to the list. But thanks for the feedback. That's obviously my concern. I remember as a kid bending the frame on a small BMX bike I had going over speedbumps. The whole seat post just bent down and wound up with the seat on the back tire. I'm definitely not looking to recreate that experience with my now much more expensive bike.
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Old 05-16-17, 10:36 AM
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NB; 4130 is the industry standard designation for a specific steel alloy and the % of chromium and molybdenum in it.
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Old 05-16-17, 11:44 AM
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If your legs aren't almost straight at maximum extension while pedaling then, yes, your seat isn't high enough and if your current post is maxed out, then you need a longer seat post. With a longer post, your crank forward bike could become a crank really far forward bike.
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Old 05-17-17, 08:08 AM
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Maybe at 400# the seat needs an extra strut pair , fabricated *, to be bracing to the rear axle, in addition..

Making a triangle. a strong shape.

* You get a local metalworker to make it, rather than expect to find it on the 'net' pre made..
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