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#21
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I broke a seat post.
On Fri, 4 Apr 2014 12:42:02 -0700 (PDT), Sir Ridesalot
wrote: On Friday, April 4, 2014 11:12:44 AM UTC-4, sms wrote: On 4/3/2014 6:38 PM, James wrote: http://www.ebay.com/itm/New-ITM-Forg...-/181343516543 It's lasted several years, and wasn't especially expensive or light, but I'm not a heavy rider and don't expect to break such things. It is a fairly crap design, in my opinion. The post is an Al tube with a thin layer of CFRP. The CFRP is just a conformal coating to make the aluminum seat post appear to be a carbon fiber seat post. But neither aluminum or carbon fiber is a great material for seat posts. Check http://www.rivbike.com/Saddles-Seat-Posts-s/48.htm?searching=Y&sort=2&cat=48&show=12&page=1 for some good replacements. Another CF seatpost recall that was in my inbox today, even though it happened last year: http://www.bicycleretailer.com/north-america/2013/08/08/giant-recalls-200-bikes-due-seatposts Are you serious? Aluminium is not good seat post material? What about the millions of such seatposts in use? Cheers One must always consider the source of the argument :-) -- Cheers, John B. |
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#22
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I broke a seat post.
DATAKOLL MARINE RESEARCH wrote:
On Friday, April 4, 2014 6:16:09 PM UTC-4, Duane wrote: DATAKOLL MARINE RESEARCH wrote: GOOD GRIEF...the LBS works on your bike ? why is this ? They need to feed their kids? Needed a new chain ring. They install it for free. -- duane ........................ amazing....is this LBS online ? No but I'm sure they make up for the labor in their mark up. Price for the chain ring wasn't particularly low. -- duane |
#23
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I broke a seat post.
On 05/04/14 06:57, Frank Krygowski wrote:
On 4/4/2014 3:42 PM, Sir Ridesalot wrote: On Friday, April 4, 2014 11:12:44 AM UTC-4, sms wrote: But neither aluminum or carbon fiber is a great material for seat posts. Check http://www.rivbike.com/Saddles-Seat-Posts-s/48.htm?searching=Y&sort=2&cat=48&show=12&page=1 for some good replacements. Are you serious? Aluminium is not good seat post material? What about the millions of such seatposts in use? Apparently no one of my seatposts is any good, since they're all made of aluminum. I'm not looking forward to spending $204 apiece to get them up to "sms" standards. :-( http://www.rivbike.com/product-p/sp3.htm I was thinking about buying a Deda Zero 100. http://www.chainreactioncycles.com/a...k/rp-prod84212 Nothing like $200. -- JS |
#24
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I broke a seat post.
On Friday, April 4, 2014 11:11:27 PM UTC-4, James wrote:
On 05/04/14 06:57, Frank Krygowski wrote: On 4/4/2014 3:42 PM, Sir Ridesalot wrote: On Friday, April 4, 2014 11:12:44 AM UTC-4, sms wrote: But neither aluminum or carbon fiber is a great material for seat posts. Check http://www.rivbike.com/Saddles-Seat-Posts-s/48.htm?searching=Y&sort=2&cat=48&show=12&page=1 for some good replacements. Are you serious? Aluminium is not good seat post material? What about the millions of such seatposts in use? Apparently no one of my seatposts is any good, since they're all made of aluminum. I'm not looking forward to spending $204 apiece to get them up to "sms" standards. :-( http://www.rivbike.com/product-p/sp3.htm I was thinking about buying a Deda Zero 100. http://www.chainreactioncycles.com/a...k/rp-prod84212 Nothing like $200. -- JS kinky ! but 2 screws ? nowhere Dude I bought a Ritchie only to find the dang thing is held on with 4 screws. Now I have a Ritchie n a bag of spare screws.....n spare wrenches. |
#25
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I broke a seat post.
Andre Jute schreef op 4-4-2014 23:59:
On Friday, April 4, 2014 7:28:35 AM UTC+1, Lou Holtman wrote: On Friday, April 4, 2014 3:38:42 AM UTC+2, James wrote: http://www.ebay.com/itm/New-ITM-Forg...-/181343516543 The bad part is that the seat clamp is a forged and machined part, and only inserts into the tube with a plug about an inch long, and held with glue. That is why I like my Thomson posts. Even Thomson aren't immune to breakages. A few years ago a chap who posted on RBT from Chicago had a Thomson seat post break under him and cause him an injury. Andre jute Sure, but IIRC there was strong evidence that the bolts were overtightened. It is a well designed seatpost. Milled from one piece of high quality aluminum, av=curate outer diameter dimension, good quality steel bolts which are only under tension. For a high end post reasonably priced and reasonably light. Even Chalo approved them. To James I would reconsider buying the Deda post. It is Italian ;-). Lou |
#26
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I broke a seat post.
On Sat, 05 Apr 2014 14:11:27 +1100, James
wrote: On 05/04/14 06:57, Frank Krygowski wrote: On 4/4/2014 3:42 PM, Sir Ridesalot wrote: On Friday, April 4, 2014 11:12:44 AM UTC-4, sms wrote: But neither aluminum or carbon fiber is a great material for seat posts. Check http://www.rivbike.com/Saddles-Seat-Posts-s/48.htm?searching=Y&sort=2&cat=48&show=12&page=1 for some good replacements. Are you serious? Aluminium is not good seat post material? What about the millions of such seatposts in use? Apparently no one of my seatposts is any good, since they're all made of aluminum. I'm not looking forward to spending $204 apiece to get them up to "sms" standards. :-( http://www.rivbike.com/product-p/sp3.htm I was thinking about buying a Deda Zero 100. http://www.chainreactioncycles.com/a...k/rp-prod84212 Nothing like $200. No, it is A$ 82.34 plus shipping. Seems like a lot of money for a seat post. Even one that is infinitely adjustable. But far better than US$ 200.00 :-) -- Cheers, John B. |
#27
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I broke a seat post.
ow $ carbon bears well under compression ? its the saddle holder......
just degassing....the joint is suspect. http://www.universalcycles.com/searc...der=price_desc |
#28
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I broke a seat post.
On 05/04/2014 11:57, John B. wrote:
On Sat, 05 Apr 2014 14:11:27 +1100, James wrote: On 05/04/14 06:57, Frank Krygowski wrote: On 4/4/2014 3:42 PM, Sir Ridesalot wrote: On Friday, April 4, 2014 11:12:44 AM UTC-4, sms wrote: But neither aluminum or carbon fiber is a great material for seat posts. Check http://www.rivbike.com/Saddles-Seat-Posts-s/48.htm?searching=Y&sort=2&cat=48&show=12&page=1 for some good replacements. Are you serious? Aluminium is not good seat post material? What about the millions of such seatposts in use? Apparently no one of my seatposts is any good, since they're all made of aluminum. I'm not looking forward to spending $204 apiece to get them up to "sms" standards. :-( http://www.rivbike.com/product-p/sp3.htm I was thinking about buying a Deda Zero 100. http://www.chainreactioncycles.com/a...k/rp-prod84212 Nothing like $200. No, it is A$ 82.34 plus shipping. Seems like a lot of money for a seat post. Even one that is infinitely adjustable. But far better than US$ 200.00 :-) But But But it's still Aluminium and hence dangerous! |
#29
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I broke a seat post.
On Sat, 05 Apr 2014 14:36:08 +0100, Clive George
wrote: On 05/04/2014 11:57, John B. wrote: On Sat, 05 Apr 2014 14:11:27 +1100, James wrote: On 05/04/14 06:57, Frank Krygowski wrote: On 4/4/2014 3:42 PM, Sir Ridesalot wrote: On Friday, April 4, 2014 11:12:44 AM UTC-4, sms wrote: But neither aluminum or carbon fiber is a great material for seat posts. Check http://www.rivbike.com/Saddles-Seat-Posts-s/48.htm?searching=Y&sort=2&cat=48&show=12&page=1 for some good replacements. Are you serious? Aluminium is not good seat post material? What about the millions of such seatposts in use? Apparently no one of my seatposts is any good, since they're all made of aluminum. I'm not looking forward to spending $204 apiece to get them up to "sms" standards. :-( http://www.rivbike.com/product-p/sp3.htm I was thinking about buying a Deda Zero 100. http://www.chainreactioncycles.com/a...k/rp-prod84212 Nothing like $200. No, it is A$ 82.34 plus shipping. Seems like a lot of money for a seat post. Even one that is infinitely adjustable. But far better than US$ 200.00 :-) But But But it's still Aluminium and hence dangerous! Well, Steel seat posts are available, and usually at a substantially cheaper price than aluminum.. Of course they require a separate seat clamp to clamp the seat to the post but these never seem to fail. As I was walking back from the Sub-Way this afternoon I passed an old bike, completely worn out, someone had thrown it in the trash..... but the steel seat post and seat clamp were still functional and with no cracks or other signs of failure. -- Cheers, John B. |
#30
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I broke a seat post.
On 4/4/2014 8:15 PM, John B. wrote:
On Fri, 04 Apr 2014 08:13:55 -0500, AMuzi wrote: On 4/3/2014 8:57 PM, DATAKOLL MARINE RESEARCH wrote: tubes are made from flat sheets then welded into tubes with a seam ... amazing. mine break of under the saddle holder. Once bit...there's a spare on hand at uhuhuh 24.7869 mm Tubes and pipes may be seamless or seamed: http://www.tubecon.co.za/en/technica...i/tube-vs-pipe Plenty of examples both ways. Your example seemed to be primarily a supplier of steel goods while a company who appears to supply both steel and aluminum goods http://www.onealsteel.com/aluminum-tube.html seems to have this to say: There are different kinds of aluminum tubing, with the most common and least expensive being extruded aluminum tube. Extruded tube is manufactured using the porthole method to produce a seamless, strong tube. Aluminum tubes with walls too thin to be extruded are manufactured by rolling and welding narrow aluminum strip. Welded tube is fairly inexpensive and is used for light support products such as lawn furniture, toys and drains. His 6061 and 6063 aluminum tube is all extruded. In mitigation I might add that all of the stainless steel tubing I've seen in the past 10 years, or so, has been welded. I replaced damaged tubes on a 1919 JIC race bike which had thin wall (0.9)steel seamed tubes. With brazed seams no less. Fairly light frame, probably the bees knees for 1919. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
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