kristoff no-likey tubeless @ roubaix

[wallymann]

tubeless are still clinchers at the end of the day, why would he run them on the cobbles when low pressures are de-rigeur?! it doesnt say if he was also using sealant which i imagine would be mandatory with tubeless on the stones.

http://www.cyclingnews.com/news/kris...paris-roubaix/

[oldpotatoe]

Originally Posted by wallymann

tubeless are still clinchers at the end of the day, why would he run them on the cobbles when low pressures are de-rigeur?! it doesnt say if he was also using sealant which i imagine would be mandatory with tubeless on the stones.

http://www.cyclingnews.com/news/kris...paris-roubaix/

"In Belgium it was working fine, and in recon, but in this race here you’re in the pack and you don’t really see where there are holes. I punctured twice before the Arenberg Forest and from there I never came back. I had three flats all together and then I changed to a bike with normal tyres.

"I knew that it was a big risk but these wheels are really good. I had success the last few weeks on them and I felt good today, until I punctured. We’d just not try it again next year."

NORMAL=Tubular, thanks.. Wonder if it was a 'puncture' or a 'burp'..either way, wheel change.

[old fat man]

Originally Posted by wallymann

tubeless are still clinchers at the end of the day, why would he run them on the cobbles when low pressures are de-rigeur?! it doesnt say if he was also using sealant which i imagine would be mandatory with tubeless on the stones.

http://www.cyclingnews.com/news/kris...paris-roubaix/

That's exactly why you choose tubeless. Nothing to pinch flat.

Originally Posted by Cyclingnews

Kristoff chose to stick with Vittoria Corsa Graphene 2.0 25mm tubeless tyres in conjunction with Campagnolo Bora WTO tubeless-ready wheels that he had raced on throughout the spring.

And he chose 25mm wide tires? Even 10 years ago the pros were riding 27mm+ tires for PR

[Lionel]

Got to be brain dead to ride 25mm tubeless in roubaix

[wallymann]

Originally Posted by oldpotatoe

NORMAL=Tubular, thanks.. Wonder if it was a 'puncture' or a 'burp'..either way, wheel change.

so that's a thing with tubeless, the tyres can become unseated and you lose pressure?

edit: apparently so!

https://www.youtube.com/watch?v=4npeVITZzf8

[MattTuck]

Well, he was my pick. So surely, that is the deathknell for someone's chances of winning the race. Seriously though, I thought his chances were good, but this bone headed decision defies logic.

I'd love to know how much pressure the sponsors had been exerting on the team to ride this set up.

Not unusual to see folks around here riding 28s or 32s on regular crappy New England roads. Why is he riding 25s on the worst road surface he'll face all year??? It makes zero sense.

In the pantheon of poor equipment choices at Roubaix, it's not as bad as Hincapie or Terpstra, but seems pretty egregious.

I'm more annoyed by this than I should be, because I put my trust in him.

[El Chaba]

I wonder if the bit about 25mm is bad information...I had heard that the earlier parts of his cobbled classics campaign was on 28mm tubeless, so I would think he had at least that size...

[oldpotatoe]

Originally Posted by El Chaba

I wonder if the bit about 25mm is bad information...I had heard that the earlier parts of his cobbled classics campaign was on 28mm tubeless, so I would think he had at least that size...

Doubt that would have made any difference if the pressure was low=burp..

Want low pressure tires w/o pinch flats and no burps??

[batman1425]

Originally Posted by El Chaba

I wonder if the bit about 25mm is bad information...I had heard that the earlier parts of his cobbled classics campaign was on 28mm tubeless, so I would think he had at least that size...

Cyclingnews has pics of his bike. Although they don't show the label close enough to confirm, they sure look like 28s based on the volume.

[JStonebarger]

Originally Posted by oldpotatoe

Doubt that would have made any difference if the pressure was low=burp..

Want low pressure tires w/o pinch flats and no burps??

Tubulars pinch flat just fine, so I'll stick with clinchers.

[oldpotatoe]

Originally Posted by JStonebarger

Tubulars pinch flat just fine, so I'll stick with clinchers.

?? I guess if you smack any bike tire hard enough but considering the design of each('sharp-ish rim vs not)...I see no compelling reason to switch any of my 3 wheelsets to clincher(or tubeless)..certainly not because

Tubulars pinch flat just fine

[JStonebarger]

Originally Posted by oldpotatoe

?? I guess if you smack any bike tire hard enough but considering the design of each('sharp-ish rim vs not)...I see no compelling reason to switch any of my 3 wheelsets to clincher(or tubeless)..certainly not because

You can watch it happen in pretty much every pro cyclocross race. And there's nothing sharp about clincher rims -- especially not through the tire. The tiny tear (not cut) would happen just as easily using a hammer on a table.

I wouldn't suggest you switch. I use both clinchers and tubulars in cyclocross, and they both pinch flat.

"[Pinch flats] occur when the tire casing bottoms on the rim, causing a compression failure in the tube for both clinchers and tubulars, much like pinching the cheek with thumb and forefinger. The fingertips simulate the tire casing and the cheek the tube." Jobst Brandt https://www.sheldonbrown.com/brandt/snakebites.html
(My second Jobst quote today.)

[Mark McM]

Originally Posted by oldpotatoe

?? I guess if you smack any bike tire hard enough but considering the design of each('sharp-ish rim vs not)...I see no compelling reason to switch any of my 3 wheelsets to clincher(or tubeless)..certainly not because

I don't often ride tubulars, but I ride with some riders who still regularly use them (old habits for old riders). I've witnessed several tubular pinch flats, so I know they are not immune to them. Although it does appear that pinch flats with tubulars are much less common than with clinchers.

[ultraman6970]

They went tubeless???? baaaaaaaaad idea... hope they learn from this.

[JStonebarger]

Originally Posted by Mark McM

... it does appear that pinch flats with tubulars are much less common than with clinchers.

I wonder how much of that is latex vs. butyl, since butyl is more commonly used with clinchers and is much easier to tear than latex.