tag:blogger.com,1999:blog-13887692.post7762858709480183190..comments2024-03-21T03:15:06.288-04:00Comments on Cozy Beehive: Forces In A Sprint CrashRon Georgehttp://www.blogger.com/profile/18394865788996482667noreply@blogger.comBlogger15125tag:blogger.com,1999:blog-13887692.post-44534608672597747182010-06-25T09:51:16.983-04:002010-06-25T09:51:16.983-04:00I'm sorry. It looks the other guys in the spri...I'm sorry. It looks the other guys in the sprint with Evans actually runs his wheel over before the actually carnage. No?Anonymoushttps://www.blogger.com/profile/12403147567847404761noreply@blogger.comtag:blogger.com,1999:blog-13887692.post-21100177507510392882010-06-21T10:24:19.595-04:002010-06-21T10:24:19.595-04:00It appears they covered meters 175 to 50 in 7 seco...It appears they covered meters 175 to 50 in 7 seconds, which would be 40 mph. I can't time it to better precision than that due to perspective. The strange thing is they seem to cover meters 100 to 50 extremely quickly, but that's probably a perspective trick.djconnelhttps://www.blogger.com/profile/01484858820878605035noreply@blogger.comtag:blogger.com,1999:blog-13887692.post-66257335409336907122010-06-20T15:42:39.483-04:002010-06-20T15:42:39.483-04:00with regards to the wheel buckling when it hit the...with regards to the wheel buckling when it hit the dog, was this dramatic effect not a result of the rim being under 'tension' from breaking. (similar to getting a friend to stand on an empty coke can, without crushing it, then flicking the side which induces a complete crumpling)Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-13887692.post-28799401561761338212010-06-17T09:50:42.932-04:002010-06-17T09:50:42.932-04:00the race stewards did not see the cause as a gentl...the race stewards did not see the cause as a gentle push from haussler. Excellent post on all other accountsAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-13887692.post-1515380157008278672010-06-17T01:45:04.531-04:002010-06-17T01:45:04.531-04:00I love this blog. Blows all the others right out o...I love this blog. Blows all the others right out of the water.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-13887692.post-6802789006835642632010-06-16T22:24:49.760-04:002010-06-16T22:24:49.760-04:00Ron, Cavendish's wheel got impacted laterally:...Ron, Cavendish's wheel got impacted laterally: clearly visible at 1:15 in the video.<br /><br />I can't think of any wheels, including MTB hoops that would not taco in that sort of case.<br /><br />I do agree the survivability of some carbon hoops is quite suspect in other cases, say comparing Casars dog crash versus Burghardt's dog crash (the latter had complete wheel failure while Casar was able to ride away), but I've yet to hear of a case where an exceptional lateral failure of a carbon rim has actually caused a crash. In both cases they ate tarmac regardless of what the front wheel was doing.<br /><br />When you've got a team car and neutral cars with spares its a value call on the wheel.<br /><br />What makes me laugh is people training on carbon hoops or the proliferation of them in the cat 3/4 packs. But then I also snark at overly expensive bike gear in general.Unknownhttps://www.blogger.com/profile/00403695097675640092noreply@blogger.comtag:blogger.com,1999:blog-13887692.post-84872039280451689312010-06-16T21:11:53.463-04:002010-06-16T21:11:53.463-04:00Jason : Let me reiterate. I have not yet seen a we...Jason : Let me reiterate. I have not yet seen a well built alloy FRONT wheel buckling due to the side loads of an impending fall. This to me is a rare situation. I have seen a carbon front wheel buckling here, in the video. I have also seen a similar wheel deforming when the rider hit a dog at less than 10mph. They make me laugh.Ron Georgehttps://www.blogger.com/profile/18394865788996482667noreply@blogger.comtag:blogger.com,1999:blog-13887692.post-4134666707837087272010-06-16T20:46:05.248-04:002010-06-16T20:46:05.248-04:00**The carbon rim didn't bend it snapped. I'...**The carbon rim didn't bend it snapped. I'd guess since the spokes broke as well then the tire would pull the broken rim back into a circle.**<br /><br />Look at the wheel/rim in subsequent pictures, it's definitely partially fractured but something more than just a tire is holding it together - possibly some part of the weave still intacted or the core?Unknownhttps://www.blogger.com/profile/00403695097675640092noreply@blogger.comtag:blogger.com,1999:blog-13887692.post-22629354857971469582010-06-16T20:30:17.285-04:002010-06-16T20:30:17.285-04:00**I'll see first hand evidence of a 32 spoke a...**I'll see first hand evidence of a 32 spoke aluminum wheel doing this and then make the conclusion.**<br /><br />Come on, you've never seen a crash-tacoed alloy rim once? ever?<br /><br />Alloy rims get folded up dramatically in crashes all of the time - no rim is going to come out getting ridden over or plowing into a high obstacle at serious speed.<br /><br />The failure mode of the wheel in crash situations of that type are largely irrelevant anyway unless it increases injury chances to the riders (ie carbon splinters, or similar cutting/puncture hazards etc). Race legal wheels are supposedly tested for minimum failure standards (impact resistance and failure behavior) as a result.<br /><br />This isn't like the R-sys failure where a minor incident with the wheels lead to catastrophic failure of the whole wheel.<br /><br />What I have seen and heard a lot of is simultaneous failure of multiple spokes causing cornering crashes in supposedly "bomb proof" alloy rims.Unknownhttps://www.blogger.com/profile/00403695097675640092noreply@blogger.comtag:blogger.com,1999:blog-13887692.post-39160000881369285622010-06-16T16:51:27.050-04:002010-06-16T16:51:27.050-04:00That is painful to watch. It's one of the wor...That is painful to watch. It's one of the worst crashes I've seen in recent memory. My last stage race had only mountain top finishes. One more reason I'm glad I'm a climber!Jimhttps://www.blogger.com/profile/11938379025774754317noreply@blogger.comtag:blogger.com,1999:blog-13887692.post-87234340212519593872010-06-16T16:47:56.719-04:002010-06-16T16:47:56.719-04:00Jason said : " No road wheel is going to surv...<b> Jason said : " No road wheel is going to survive getting it's spokes crushed and being torqued out of dish like that at even low velocities. " </b><br /><br />I'll see first hand evidence of a 32 spoke aluminum wheel doing this and then make the conclusion.Unknownhttps://www.blogger.com/profile/12256394060474969622noreply@blogger.comtag:blogger.com,1999:blog-13887692.post-51991544456359867322010-06-16T14:05:37.181-04:002010-06-16T14:05:37.181-04:00The carbon rim didn't bend it snapped. I'...The carbon rim didn't bend it snapped. I'd guess since the spokes broke as well then the tire would pull the broken rim back into a circle.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-13887692.post-23460703261259893482010-06-16T12:33:23.110-04:002010-06-16T12:33:23.110-04:00Uhhh...that wheel got hit and ridden over by anoth...Uhhh...that wheel got hit and ridden over by another bike on the rim edge and spokes as it was laying down at high speed when it flexed. No road wheel is going to survive getting it's spokes crushed and being torqued out of dish like that at even low velocities. I'm actually impressed the carbon rim too that much flex out of dish and bounced back round elastically.Unknownhttps://www.blogger.com/profile/00403695097675640092noreply@blogger.comtag:blogger.com,1999:blog-13887692.post-82844695027261527902010-06-16T09:34:12.385-04:002010-06-16T09:34:12.385-04:00Is it Lightweight brand of wheels? Well that speak...Is it Lightweight brand of wheels? Well that speaks a bit about its ability to withstand side loading doesn't it? The loading in terms of torsion must have been substantial as Cavendish was going down.<br /><br />Recall not too long back when a Tour de France rider hit a dog that came across his path and the wheel crumpled like paper. I think he was going at about 10 mph.Ron Georgehttps://www.blogger.com/profile/18394865788996482667noreply@blogger.comtag:blogger.com,1999:blog-13887692.post-80830158958740774302010-06-16T07:18:28.927-04:002010-06-16T07:18:28.927-04:00Great post.
Take a look at the video at about 18...Great post. <br /><br />Take a look at the video at about 18 seconds - it looks like Cavendish's wheel buckles or bends and then snaps back into place as he goes down. Is this a factor in the crash, or a result of it?VeloLoserhttp://www.veloloser.comnoreply@blogger.com