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any tubular riders rethinking...(16 posts)

any tubular riders rethinking...kgg
Jul 14, 2003 2:40 PM
their choice after todays stage?
Ever have a clincher blow off the rim?Humma Hah
Jul 14, 2003 2:47 PM
I have. 110 psi. Just sitting in the stand in the garage.
Ever have a clincher blow off the rim?kgg
Jul 14, 2003 2:58 PM
In fact, I have. And it wasn't even 110 psi. It was on an mtb - hit a sidehill pretty hard, and it pulled off. Very surprising - but the tube didn't blow, just bulged. I was able to let out the air and put it all back together.

By the way - not trying to provoke anyone - just wondering if you think clinchers might have been safer in such circumstance. I don't think I'll ever be doing 30 mph (at a guess) around hairpin turns, so it's not much of a concern for me personally. I've also ridden sewups for several years, and liked them. Never rolled one either. When I recently returned to road biking, I just didn't want the hassle anymore so I went with clinchers. Had nothing to do with concern about rolling one off the rim.
I think tires generally lead a pretty rough life.Humma Hah
Jul 14, 2003 3:04 PM
... Blasting into a corner downhill with a TdF stage win 10 seconds ahead of you is gonna be rough on any tire, especially anything light enough to have raced up the mountain in the first place. To have then hit molten tar?!!! I'm not sure the clincher/tubular question had anything to do with this accident.

For me, clinchers. I don't have a wheel wagon following me around, and I'm a little intimidated by the sew-up/glue-on thing. For a pro, I'll let them be the judge.
Carbon Rims and Beloki's crashCoot72
Jul 14, 2003 3:11 PM
The carbon braking surface on Beloki's bike could have contributed to the crash more than the tire. Beloki locked his rear wheel. Then the tire went *pop*.

I recall reading somewhere that Jan Ullrich's crash 2 years ago was partially due to a speed wobble on lightweight carbon rims, braking, going downhill.

Carbon braking surfaces are known to be more grabby compared to Al braking surfaces. Anyone have experience with this?

Coot
Carbon Rims and Beloki's crashkgg
Jul 14, 2003 3:45 PM
No experience with the carbon rim - guess I didn't really notice that. But, thinking about that slowmo video some more, it wouldn't surprise me I guess that you could also pop a clincher off in those circumstances.

I sure would hate to be the guy who carries the responsibility of gluing on the tires. Not assigning any blame - just noting that sometimes the rider's life could depend on your job - and that is a lot of pressure.
re: any tubular riders rethinking...12x23
Jul 14, 2003 4:08 PM
Look at Beloki's rear wheel. Is that Velox clincher rim tape, tubular gluing tape, tubular tire basetape separated from the tire and stuck on the rim, or a shiny bed of Mastik or Conti tub glue on the exposed rim? I don't know what Beloki's team uses, but I'm curious. It looks a lot like Velox to me. If that's the case, he popped a clincher tire and was unfortunate when the rim met the road.

http://www.velonews.com/images/details/4520.5461.f.jpg
looks like velox rim tape to me ( nm )superdog
Jul 14, 2003 7:16 PM
no not at all. (nm)flying
Jul 14, 2003 5:34 PM
Light weight tires more than tubulars....Dave Hickey
Jul 14, 2003 5:53 PM
Their racing tires are so thin and light weight, locking the rear brake is going to blow the tire. I think it would have happened even if he rode clinchers.
clincher = pinch flat for LanceShockee
Jul 14, 2003 7:31 PM
I think LA would have had a much higher risk of a pinch flat if he had clinchers. Of course, the Pros don't plan to be offroading it (wow!), but the lower, rounder tubular rim edges do help to prevent pinch flats. All it would take is one stone edge and 'pop'. (caveat: yeah, I know - he was pretty luck not to flat with any road tire today!)

I've rolled a tubular once in a crit: using velox tape! Stuck with glue after that lesson. I definitely suffered far fewer flats than my clincher-sportin training buddies.
I think that tire is a clinchersuperdog
Jul 14, 2003 8:20 PM
I downloaded Lview Pro and loaded the pic of the crash scene. After zooming in on the damaged wheel it looks like that is velox rim tape and I think I can see a bead on the tire. The way the sun is shining on the tire and making a shadow makes it look like there is a tire bead there. If the tubular split open and curved outward it might possible cast a shadow like this one but I really think it's a clincher. What do you think?
Here's the picture (if I can get it to upload)superdog
Jul 14, 2003 8:23 PM
Look at the shadow on the tire. A smooth tubular would not cast that shadow.
so - any clincher riders rethinking their choice?kgg
Jul 14, 2003 8:26 PM
I guess I just assumed it was a sewup. But, looking at the still photo where he's lying on his side, I couldn't convince myself that it wasn't a clincher.

Hey, I'm willing to be swayed by the evidence. Right now, I'd say I just can't decide which it was.
They are tubies.....CharlesTT
Jul 14, 2003 10:37 PM
They are obviously tubular tires. None of you realize that ONCE uses all-carbon wheels from campy. Beloki was using the Hyperon carbon wheelset. They dont even make it in clincher. And they were hutchinson tubualr tires. Believe me, you cant find the model on their web site......LA was using the same tire with a natural color side-wall.
They are clinchers.....mapei boy
Jul 15, 2003 9:48 AM
To these eyes, those are clincher rims with velox rim tape. Whatever brand and style rim & tire the Once riders are supposed to be officially riding during the tour, on that day it looks plain that Beloki chose to go the clincher route.