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#1
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Need 1 inch diameter seatpost??
I need an extra-long seatpost for a cheap bike that uses a 1 inch
diameter post. The entire length. It doesn't get smaller at the seat. The current post is about 10 inches long. I am just an occasional bicylist these days, and I hope you will not mind the low-budget question I have. I have a 24" bicycle that I fished out of the woods in pretty bad shape. I like it because it was cheap to begin with and it's not worth anything now and I can leave it outside in the rain, etc. Otherwise, I have a hard time getting my better bike in and out of the small house. I've looked on the web and most of the posts are 13/16ths inches in diameter. This one is one inch. It's about 10 inches long and I'm pretty sure another 6 inches would be plenty, maybe less. (too cold to go check) Any idea where I could get something very cheap? I can't just use iron pipe, can I? It will break. I'll bet a hardwood dowel rod would be pretty strong, but I think the ones they sell are made out of softer wood. Any ideas? Thanks. |
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#2
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Need 1 inch diameter seatpost??
"mm" wrote: (clip) I can't just use iron pipe, can I? It will break. I'll bet a hardwood dowel rod would be pretty strong, but I think the ones they sell are made out of softer wood. Any ideas? Thanks. ^^^^^^^^^^^^^^^^^^^^^^^^ Pipe is not made to 1" OD. 1" tubing is available, but you may have a difficult time finding something with enough wall thickness to be strong enough, without buying a 20' length, which will cost more than the whole bike is worth. I would not trust ANY wood. The first time you go over a bump with your weight on the seat it will break, and you could be injured. Do you know anyone who welds? You could add a length of pipe, or a short length from another seat post to the top of your existing seat post. The diameter at the seat clamp isn't nearly as critical as the diameter where it goes into the frame. |
#3
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Need 1 inch diameter seatpost??
On Dec 23, 3:37*pm, mm wrote:
I need an extra-long seatpost for a cheap bike that uses a 1 inch diameter post. *The entire length. It doesn't get smaller at the seat. The current post is about 10 inches long. * I am just an occasional bicylist these days, and I hope you will not mind the low-budget question I have. I have a *24" bicycle that I fished out of the woods in pretty bad shape. I like it because it was cheap to begin with and it's not worth anything now and I can leave it outside in the rain, etc. *Otherwise, I have a hard time getting my better bike in and out of the small house. I've looked on the web and most of the posts are 13/16ths inches in diameter. *This one is one inch. *It's about 10 inches long and I'm pretty sure another 6 inches would be plenty, maybe less. (too cold to go check) *Any idea where I could get something very cheap? I can't just use iron pipe, can I? *It will break. * I'll bet a hardwood dowel rod would be pretty strong, but I think the ones they sell are made out of softer wood. I'd trust an iron pipe more than any wooden dowel, but you might have a rust problem if it's left outside. Our tandem probably has the world's strongest seatpost. The original was steel but it bent after extended use. The diameter was 25.0 mm so I got a piece of solid 1" aluminum rod and turned it down to 25 mm and further turned down the end to fit the seat clamp. Was going to drill it out but never got around to it and the extra weight isn't really significant on a tandem anyway. www.speedymetals.com has aluminum tubing for sale in a variety of sizes. Looks like about $5 plus shipping for an 18" long piece with pretty thick walls. I've never ordered anything from them, so this isn't a recommendation for any particular supplier - they were just the first one I found. BTW, if you use a tube you probably want to cover the end so you don't get water flowing down inside the frame. |
#4
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Need 1 inch diameter seatpost??
On Tue, 23 Dec 2008 17:54:50 -0800 (PST), peter
wrote: www.speedymetals.com has aluminum tubing for sale in a variety of sizes. Looks like about $5 plus shipping for an 18" long piece with Hey that's great. Thanks a lot. As you can see below, I really found this site interesting. I might be willing to spend a little more on the theory that the bike will fall apart but I'll still have the aluminum! If you don't read the rest, read the part marked "+++++++++++++Check out this paragraph:::" They have a solid piece for 11.53. 2011 is commonly used for high speed automatic screw machine parts, small precision gears, machine parts, atomizer and hose parts, pipe stems, TV fittings, auto fuel system components, clock parts, tube fittings, camera parts, industrial connectors, speedometer components, etc. This is one of those places that won't tell you the shipping cost until the very end. Worse yet, you have to register, name, address, password, phone... They must do this on purpose but I don't know why. Maybe to ward off small customers. But they call it shipping, not shipping and handling, so maybe it's the regular UPS rate which is pretty low. Interesting. I'm learning about grades of aluminum. 2024 grade, same piece -- $9.11 for 18 inches of rod. I thought it would be more money because the uses sounded impressive, especially the part about gears: 2024 is commonly used for structural components, couplings, hydraulic valve bodies, fuse parts, gears and shafts, worm gears, pistons, rectifier parts, missile parts, munitions, fasteners, cap nuts, bolts, hardware, truck wheels, transportation industry parts, computer parts, clock parts, veterinary and orthopedic equipment, and commonly in the aircraft industry for aircraft fittings, fuselage structurals, wing tension members, shear webs and ribs and structural areas where stiffness, fatigue performance and good strength-to-weight ratio is required.. *************** Check out this paragraph::: Next comes 6061, used for bike frames. $6.55 for the piece. (Interesting. The 1" tube with 1/4 inch walls is #6.96, with 1/8 inch walls $3.76. But with .083 walls it's 9.41!!!!! But .065 wall is $2.62. I'm confused. Maybe .083 is rarely made, or the price is wrong. .058 is $8.57; .049 is $6.34. .035 is $6.04. I don't get it. Is 1/8" walls enough? 3 more dollars and it's solid. It looks like this grade and 2024 are both stronger than 2011 at the top, and cheaper too. That seems strange. 6061 is commonly used for structural components, screw machine parts, frames, brackets, jigs, fixtures, base plates, machine parts, couplings, hydraulic valve bodies, valves and valves parts, fuse parts, gears and shafts, worm gears, pistons, rectifier parts, fasteners, hardware, truck and marine components, marine fittings and hardware, electrical fittings and connectors, hinge pins, magneto parts, brake pistons, hydraulic pistons, appliance fittings, camera lens mounts, bike frames, etc. 6061 is used for heavy duty structures requiring good strength-to-weight ratio with good corrosion resistance. 6061 is easily cold worked and formed in the annealed condition. Cutting, stamping, bending, spinning, deep drawing, drilling, tapping, etc. are all readily accomplished using standard methods. 7075 $14.57 Due to its high strength-to-weight ratio, 7075 is used for highly stressed structural parts. Applications include aircraft fittings, gears and shafts, fuse parts, meter shafts and gears, missile parts, regulating valve parts, worm gears, keys, and various other commercial aircraft, aerospace and defense equipment and components. Looking at tube now: Grade: 6061 tube is commonly used for structural components, frames, machine parts, truck and marine components, marine fittings, electrical fittings and connectors, bike frames, railings, truck racks, etc. 6061 is used for heavy duty structures requiring good strength-to-weight ratio with good corrosion resistance. 6061 is easily cold worked and formed in the annealed condition. Cutting, stamping, bending, spinning, deep drawing, drilling, tapping, etc. are all readily accomplished using standard methods. As to Pipe, no good because the 3/4 pipe has O.D of 1.05 inches. And others are also too big or small. pretty thick walls. I've never ordered anything from them, so this isn't a recommendation for any particular supplier - they were just I accept your disclaimer, and won't sue you when it breaks and the stup injures me. the first one I found. BTW, if you use a tube you probably want to cover the end so you don't get water flowing down inside the frame. |
#5
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Need 1 inch diameter seatpost??
On Tue, 23 Dec 2008 18:37:16 -0500, mm wrote:
I need an extra-long seatpost for a cheap bike that uses a 1 inch diameter post. The entire length. It doesn't get smaller at the seat. The current post is about 10 inches long. I am just an occasional bicylist these days, and I hope you will not mind the low-budget question I have. I have a 24" bicycle that I fished out of the woods in pretty bad shape. I like it because it was cheap to begin with and it's not worth anything now and I can leave it outside in the rain, etc. Otherwise, I have a hard time getting my better bike in and out of the small house. I've looked on the web and most of the posts are 13/16ths inches in diameter. This one is one inch. It's about 10 inches long and I'm pretty sure another 6 inches would be plenty, maybe less. (too cold to go check) Any idea where I could get something very cheap? I can't just use iron pipe, can I? It will break. I'll bet a hardwood dowel rod would be pretty strong, but I think the ones they sell are made out of softer wood. Any ideas? Thanks. You want to use a seatpost shim to enlarge the diameter of the post at the clamp. Shims look like: http://www.trisports.com/problem-sol...post-shim.html You can make them out of aluminum cans, although there's a website that suggests you use beer cans. Stephen Bauman |
#6
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Need 1 inch diameter seatpost??
On Dec 23, 7:29*pm, mm wrote:
On Tue, 23 Dec 2008 17:54:50 -0800 (PST), peter wrote: www.speedymetals.comhas aluminum tubing for sale in a variety of sizes. *Looks like about $5 plus shipping for an 18" long piece with Hey that's great. *Thanks a lot. *As you can see below, I really found this site interesting. * I might be willing to spend a little more on the theory that the bike will fall apart but I'll still have the aluminum! I'd opt for the 6061 for good strength and corrosion resistance. I agree that the pricing for various thicknesses looks odd - maybe they have a surplus supply of some sizes. I suggest checking the thickness of some long seatposts at a bike shop and getting a tube that's a little thicker than those. Rather get one that's stronger than needed. |
#7
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Need 1 inch diameter seatpost??
mm wrote:
I need an extra-long seatpost for a cheap bike that uses a 1 inch diameter post. The entire length. It doesn't get smaller at the seat. The current post is about 10 inches long. I am just an occasional bicylist these days, and I hope you will not mind the low-budget question I have. I have a 24" bicycle that I fished out of the woods in pretty bad shape. I like it because it was cheap to begin with and it's not worth anything now and I can leave it outside in the rain, etc. Otherwise, I have a hard time getting my better bike in and out of the small house. I've looked on the web and most of the posts are 13/16ths inches in diameter. This one is one inch. It's about 10 inches long and I'm pretty sure another 6 inches would be plenty, maybe less. (too cold to go check) Any idea where I could get something very cheap? I can't just use iron pipe, can I? It will break. I'll bet a hardwood dowel rod would be pretty strong, but I think the ones they sell are made out of softer wood. Any ideas? Thanks. You need a 25.4mm seat post. 16" is 400mm. They are made, but 350 is much more common. You have to be careful though, the spec on length is usually the total length, which is not the usable length (minimum insertion depth). Online places have such posts for under $20. I have a 450mm on my bike, but those are pretty rare. |
#8
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Need 1 inch diameter seatpost??
peter wrote:
www.speedymetals.com has aluminum tubing for sale in a variety of sizes. Looks like about $5 plus shipping for an 18" long piece with pretty thick walls. I've never ordered anything from them, so this isn't a recommendation for any particular supplier - they were just the first one I found. BTW, if you use a tube you probably want to cover the end so you don't get water flowing down inside the frame. McMaster-Carr is good about small orders & they have lots of stock. I've used them a few times. |
#9
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Need 1 inch diameter seatpost??
On Wed, 24 Dec 2008 07:28:05 -0600, Stephen Bauman
wrote: On Tue, 23 Dec 2008 18:37:16 -0500, mm wrote: I need an extra-long seatpost for a cheap bike that uses a 1 inch diameter post. The entire length. It doesn't get smaller at the seat. The current post is about 10 inches long. I am just an occasional bicylist these days, and I hope you will not mind the low-budget question I have. I have a 24" bicycle that I fished out of the woods in pretty bad shape. I like it because it was cheap to begin with and it's not worth anything now and I can leave it outside in the rain, etc. Otherwise, I have a hard time getting my better bike in and out of the small house. I've looked on the web and most of the posts are 13/16ths inches in diameter. This one is one inch. It's about 10 inches long and I'm pretty sure another 6 inches would be plenty, maybe less. (too cold to go check) Any idea where I could get something very cheap? I can't just use iron pipe, can I? It will break. I'll bet a hardwood dowel rod would be pretty strong, but I think the ones they sell are made out of softer wood. Any ideas? Thanks. You want to use a seatpost shim to enlarge the diameter of the post at the clamp. Shims look like: http://www.trisports.com/problem-sol...post-shim.html You can make them out of aluminum cans, although there's a website that suggests you use beer cans. Stephen Bauman I sort of thought 3/16ths was too much to shim in this situation. I guess not. Thanks. Do I have to drink the beer myself? |
#10
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Need 1 inch diameter seatpost??
On Tue, 23 Dec 2008 16:58:05 -0800, "Leo Lichtman"
wrote: "mm" wrote: (clip) I can't just use iron pipe, can I? It will break. I'll bet a hardwood dowel rod would be pretty strong, but I think the ones they sell are made out of softer wood. Any ideas? Thanks. ^^^^^^^^^^^^^^^^^^^^^^^^ Pipe is not made to 1" OD. 1" tubing is available, but you may have a difficult time finding something with enough wall thickness to be strong enough, without buying a 20' length, which will cost more than the whole bike is worth. I would not trust ANY wood. The first time you go over a bump with your weight on the seat it will break, and you could be injured. Do you know anyone who welds? You could add a length of pipe, or a short Actually, there's a welder a half mile from here, and another one farther, and every time I get something done, I'm amazed how little they charge. I have a tendency to think anything I haven't bought before is very expensive. Like lucite. When I finally needed a small piece of lucite, to make a vent window for my '73 Buick Centurion, it only cost a dollar. Foam rubber was very cheap the first time I bought some, but by the third time I needed the same shaped piece, it was expensive. I'm sure that's because by then I only remembered that it was cheap, very cheap, and when it wasn't as cheap as I imagined, I thought it was expensive. length from another seat post to the top of your existing seat post. The diameter at the seat clamp isn't nearly as critical as the diameter where it goes into the frame. |
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