tag:blogger.com,1999:blog-13887692.post2658575820897609087..comments2024-03-21T03:15:06.288-04:00Comments on Cozy Beehive: Broken Steerer Tube : Composites Are Not PerfectRon Georgehttp://www.blogger.com/profile/18394865788996482667noreply@blogger.comBlogger7125tag:blogger.com,1999:blog-13887692.post-60314515207479395322013-12-19T08:14:13.827-05:002013-12-19T08:14:13.827-05:00Thanks for sharing the blog about the Broken Steer...Thanks for sharing the blog about the Broken Steerer Tube, really very useful blog for us!!<br /><br /><a href="http://www.rockwestcomposites.com/browse/tube-accessories" rel="nofollow">Composite Tubes</a> Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-13887692.post-2970265581628090652013-11-06T02:31:32.161-05:002013-11-06T02:31:32.161-05:00Thanks for giving the nice information about the B...Thanks for giving the nice information about the Broken Steerer Tube in this blog. Really a great blog!!<br /><br /><a href="http://www.rockwestcomposites.com/browse/tube-accessories" rel="nofollow">Composite Tubes</a> Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-13887692.post-26772969870430256532008-12-22T01:27:00.000-05:002008-12-22T01:27:00.000-05:00Thanks for the post on the failed steerer. I had a...Thanks for the post on the failed steerer. I had an accident in May where the actual blades suddenly failed. <BR/><BR/>It was a bontrager carbon fiber fork. The bike was a friends, and had been ridden quite a bit. It failed right as I got up to sprint. Nonetheless, it was on flat ground, and wasn't involved in a crash. <BR/><BR/>Here is a link to a picture of the wheel with the remains of the fork still attached. (http://bp0.blogger.com/_uDEV4tFXYVM/SCOKUQRedQI/AAAAAAAAAGo/C3PDkjyRlzQ/s1600-h/DSCF3295.JPG )<BR/><BR/>I'd be curious to hear your thoughts on that.Daniel Forresthttps://www.blogger.com/profile/18265771315162578139noreply@blogger.comtag:blogger.com,1999:blog-13887692.post-91486038211855637642008-02-08T07:08:00.000-05:002008-02-08T07:08:00.000-05:00Thanks for that. I've had a CF fork on my road bik...Thanks for that. I've had a CF fork on my road bike for a year now. I'm changing it over to a new frame this spring and will take a careful look at the carbon steerer.<BR/><BR/>I wonder if the failures are different in CF blades to AL steers of if the all CF fail as well?<BR/><BR/>I notice while on my trainer and the front wheel is in a block that you can so easily flex the whole setup by twisting. Surprisingly easy to do.<BR/>-BBluenoserhttps://www.blogger.com/profile/03448920726947078281noreply@blogger.comtag:blogger.com,1999:blog-13887692.post-51645750826412188992008-02-04T19:14:00.000-05:002008-02-04T19:14:00.000-05:00Cycling Phun : I didn't ride the bike. Its not min...Cycling Phun : I didn't ride the bike. Its not mine :)<BR/><BR/>Carl, I was thinking the same. I'm not very sure what the role of the metal alloy (aluminum?) crown is, but I guess I can say that a stress riser, possibly in the form of a large shear force, led to the damage.<BR/><BR/>Manufacturing wise, the bonding wasn't good, or maybe too less fiber/resin or vice versa combination. It could also be that a very low grade carbon fiber was used for the design. Higher grades are stronger but also costlier.<BR/><BR/>This kind of damage is not very good, especially since its hidden within the head tube and is not noticeable while riding. Thankfully, the rider survived!Ron Georgehttps://www.blogger.com/profile/18394865788996482667noreply@blogger.comtag:blogger.com,1999:blog-13887692.post-31840450773590250172008-02-04T14:17:00.000-05:002008-02-04T14:17:00.000-05:00Looking at the failure, it seems likely that he hi...Looking at the failure, it seems likely that he hit something. Also the fork appears to be of the carbon legs, aluminum crown, carbon tube construction, this creates a large stress riser right at the al/c junction where the fork failed. A fork that is carbon monocoque will be stronger. If there was a colision that caused this failure it likely would have yielded a metal fork possibly resulting in less injuries. This highlights the need for proper design and to use things appropriately, ie Clydesdale's shouldnt ride superlight forksRCHhttps://www.blogger.com/profile/05014034490881010301noreply@blogger.comtag:blogger.com,1999:blog-13887692.post-1974823158184507372008-01-31T23:16:00.000-05:002008-01-31T23:16:00.000-05:00I don't think you're supposed to do that... ;^DI don't think you're supposed to do that... <BR/>;^DCycling Phunhttps://www.blogger.com/profile/07407316752929288793noreply@blogger.com