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Clydesdales/Athenas (200+ lb / 91+ kg) Looking to lose that spare tire? Ideal weight 200+? Frustrated being a large cyclist in a sport geared for the ultra-light? Learn about the bikes and parts that can take the abuse of a heavier cyclist, how to keep your body going while losing the weight, and get support from others who've been successful.

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Old 03-16-07, 10:55 PM   #1
bluepython723
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Do they make solid steel seat posts

I was riding down on a steep hill and apparantly the seat was too high. For those that down know about the affects of gravity the whole seat post bent backwards and I basically got reamed. So I went to the nearest bike shop and got a new one, and finished the ride. I am no longer using that bike- I'm riding the Open Road now and I was going to raise the seat- because my knees were hitting my elbows. I was raising it then it fell out. This one was only about 6 inches long. My new post is too small so I got to get a new one. I'm going to the shop tommorow, but I was wondering if they make SOLID- not hollow- seat posts so I can raise this mother without worrying.
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Old 03-16-07, 11:08 PM   #2
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Get a mountain bike seat post. Those puppies come in lengths of 15 inches or longer. The shop has been selling you road-bike seat posts (which are both shorter and lighter OR see the third paragraph of this post). I ride a Thomson brand seatpost that is reinforced internally on the front and back to prevent the "backward bending" that you've experienced. Thomson's aren't cheap, but one bent/broken seatpost is one too many.

As for solid seat posts, the tubular ones are actually stronger! This isn't an opinion, it's a fact.

By the way, you didn't say, but if you're riding a "cruiser" style, coaster-brake bike with a 3/4" diameter steel seat post, the problem isn't the seatpost, it's the bike. There's no way to get a seat post with a diameter that small that WON'T bend with a rider of substance. Unfortunately, if that's the type of bike you're riding, you need a better bike, not a longer seatpost. Better bikes come with larger-diameter seatposts that are MUCH sturdier and SAFER.

Please replace your post with a sturdier AND longer one ASAP! We'd like to keep you around.
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Old 03-17-07, 03:05 AM   #3
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I snapped mine off late last year as well (I ride with 8-9" exposed!). I was told Tompson was the strongest seatpost available. Contact Eric at Smart Bike Parts in Chicago. He'll hook you up:

http://smartbikeparts.com/index.php?...&cat=Seatposts
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Old 03-17-07, 07:11 AM   #4
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Tompson is highly recommend for us Clydes.

I had an issue with a seat post on a folding bike which bent (luckily didn't snap). I got a replacement and epoxied a steel plumbing pipe on the inside. Sucker is heavy but I can break a door down with it if need be.
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Old 03-17-07, 10:42 AM   #5
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Quote:
Originally Posted by bluepython723
I was riding down on a steep hill and apparantly the seat was too high. For those that down know about the affects of gravity the whole seat post bent backwards and I basically got reamed. So I went to the nearest bike shop and got a new one, and finished the ride. I am no longer using that bike- I'm riding the Open Road now and I was going to raise the seat- because my knees were hitting my elbows. I was raising it then it fell out. This one was only about 6 inches long. My new post is too small so I got to get a new one. I'm going to the shop tommorow, but I was wondering if they make SOLID- not hollow- seat posts so I can raise this mother without worrying.
Insert a rod or tube inside the seatpost, like Air did. It does work!
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Old 03-18-07, 01:17 PM   #6
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(I ride with 8-9" exposed!)
Can't believe that's going to go without comment.
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Old 03-18-07, 05:21 PM   #7
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Thompsons are great posts, I love'd the one on my last bike before it was stolen, and I was well over 300lbs then.

From a mechanical perspective, a hollow post (with heavy enough walls) will actually resist bending much better than a solid one. In theory, a fairly thick walled hollow post filled with a highly rigid foam would be even stronger (that's how the long bones in your body are as strong but light as they are) but I don't know how you would make one.


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Old 03-18-07, 05:28 PM   #8
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Can't believe that's going to go without comment.
And to think I still have about half of it unexposed!
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Old 03-18-07, 05:36 PM   #9
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Originally Posted by Six jours
Can't believe that's going to go without comment.
That's because I know how tall he is and the issues getting a frame in that size!
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Old 03-18-07, 09:23 PM   #10
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Quote:
Originally Posted by Halthane
Thompsons are great posts, I love'd the one on my last bike before it was stolen, and I was well over 300lbs then.

From a mechanical perspective, a hollow post (with heavy enough walls) will actually resist bending much better than a solid one. In theory, a fairly thick walled hollow post filled with a highly rigid foam would be even stronger (that's how the long bones in your body are as strong but light as they are) but I don't know how you would make one.


Paul
Take a hollow post, temporarily cap one end, get a can of that expanding foam insulation, shoot some foam into the post let it set up, and cut off the excess, you now have a rigid foam filled post.
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Old 03-19-07, 06:42 AM   #11
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http://bikeforums.net/showthread.php?t=240193
http://bikeforums.net/showthread.php?t=238801

At some point I'll get around to reposting the pictures and narrative of how I did mine but those two threads helped me.
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Old 03-19-07, 07:20 AM   #12
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Get the Thompson. I've got one on both of my bikes and never had a problem at 270lbs.
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Old 03-19-07, 07:38 AM   #13
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For half the price and 20 grams more, you could get a Salsa. I'm not knockin' the Thomson at all, but le mieux est l'ennemi du bien.
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Old 03-19-07, 08:12 AM   #14
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+1000000 on the Thomson posts. Most precise tilt adjustment of anything I've seen for micro-adjustment. Second bolt for added security, and the tube is shaped inside to put more material where it does the most good (front and back of the inside of the post are thicker, the sides are a little less so.

Light, strong, and while they are expensive I've heard of no one who has had one fail.
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Old 03-19-07, 03:38 PM   #15
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Update
------------------
I was planning on asking the bike shop for a Thomson then they slapped a bike ass labor fee on me for some brake pads. I had no more damn money on me so I was forced to just get a regular mountain bike seat post. So I may try foam filling the one I have and if it works then there isn't much reason to get a Thomson other then the added security.
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Old 03-21-07, 10:01 AM   #16
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I'm over 350lbs and ride on a Thomson, they are ABSOLUTELY BOMBPROOF.
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Old 08-29-07, 04:38 PM   #17
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bummer thompson does not make a seat post in 22.2mm a.k.a. 7/8".

i epoxied some 1/2" square tubing into my 22.2mm cro-moly seat post and i haven't had any problems since. thanks Air for the great idea.

be careful, the chemical reaction of the epoxy can get the post really, really hot!
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Old 08-29-07, 05:21 PM   #18
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Thomson. They're pretty much indestructable, and they're lighter than all but the best carbon posts. Seriously, the strength to weigh ratio of those things is incredible. They also come in ridiculous lengths - I've got the 400+ mm one on my MTB, with something like 10" exposed (I bought the frame small on purpose - I'm 6'3" & it's a 17").

I always joke that if my MTB goes off a cliff or my road bike gets hit by a car, that the seatpost will be the only thing that survives the crash.

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Old 08-29-07, 06:10 PM   #19
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Update
------------------
I was planning on asking the bike shop for a Thomson then they slapped a bike ass labor fee on me for some brake pads. I had no more damn money on me so I was forced to just get a regular mountain bike seat post. So I may try foam filling the one I have and if it works then there isn't much reason to get a Thomson other then the added security.

tap in an oak dowel with some epoxy. Your post will be bomber.
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Old 08-29-07, 08:02 PM   #20
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If you are exposing more then 6" of seatpost, the frame is too small. Us clydes should use tradtional frames and avoid compact frames a la Sean Kelly.
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Old 08-30-07, 12:48 PM   #21
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If you are really concerned go to Home Depot or Lowes and get a peice of Schedule 80 black pipe cut to your desired length. It will weigh several pounds but it will not let you down. Buy some spray paint and hook it up to your desired color or have it powder coated.
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Old 08-30-07, 01:24 PM   #22
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(I ride with 8-9" exposed!)
Can't believe that's going to go without comment.
Well, maybe if Senator Craig was here....
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Old 08-30-07, 01:26 PM   #23
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I would say go with the thomson too. I've had mine for 9 years, it's worth every penny (although I got mine for free).

Otherwise I found an old Syncros (hot stuff back in the mid nineties) post for my little brother on ebay that cost 1/3 as much.
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