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Flanders tire pressures
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According to this article, many pros ran very high pressures in Flanders. The article claims Sagan at 105/109psi on 28s, van Aert at 97psi on 28s, Kristoff at 80/87 on 28s. Even without the cobbles I would think something like 70 would be better. With the cobbles I would guess <65. I'm stunned that some pros are doing this. I find myself in such disbelief that I'm wondering if the article is just making stuff up? Anyone have any insights?
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Re: Flanders tire pressures [lanierb] [ In reply to ]
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lanierb wrote:
Kristoff at 80/87 on 28s.

And those are clinchers. He runs 7psi more when he uses tubulars.

Maybe they don't like the squirmy feel of big tires and low pressure?
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Re: Flanders tire pressures [rruff] [ In reply to ]
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rruff wrote:
lanierb wrote:
Kristoff at 80/87 on 28s.


And those are clinchers. He runs 7psi more when he uses tubulars.

Maybe they don't like the squirmy feel of big tires and low pressure?

He ran vittoria tubeless.

Most others likely trying to prevent the snake bite flat on tubs.

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Re: Flanders tire pressures [lanierb] [ In reply to ]
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I wonder if any of these teams are working with Silca? I know EF is. It would be interesting to see what they ran,
Last edited by: asgelle: Apr 8, 19 16:54
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Re: Flanders tire pressures [lanierb] [ In reply to ]
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Cobbles are pinch-flat minefields. Even with tubulars. Unless your name starts with Mathieu or ends with Poel, a flat is pretty much game over in the latter half of the race. So they're trying to avoid that.

Hit some of these edges at 30MPH and 60PSI....


Last edited by: trail: Apr 8, 19 17:02
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Re: Flanders tire pressures [trail] [ In reply to ]
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He ran tubeless - no pinch flats.

Even if there is some pinch flat risk, it would be very low on a 28, wouldn't it? Also you're burning so much extra energy at those pressures I feel like you might be better off taking that risk.
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Re: Flanders tire pressures [lanierb] [ In reply to ]
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This gets interesting at about 1:30.

The above poster is a physiologist employed by PEARL iZUMi. However, statements are not made on behalf of nor reflective of PEARL iZUMI in any manner... unless they're good, then they count.
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Re: Flanders tire pressures [lanierb] [ In reply to ]
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lanierb wrote:
According to this article, many pros ran very high pressures in Flanders. The article claims Sagan at 105/109psi on 28s, van Aert at 97psi on 28s, Kristoff at 80/87 on 28s. Even without the cobbles I would think something like 70 would be better. With the cobbles I would guess <65. I'm stunned that some pros are doing this. I find myself in such disbelief that I'm wondering if the article is just making stuff up? Anyone have any insights?

Why are you surprised? Have you been on some of the climbs and tested different wheel sets/pressures? There is a lot of riding between the climbs and many of them are smooth on the way down. I've only ridden the old course once and ran 25mm with normal pressures (about 100).
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Re: Flanders tire pressures [lanierb] [ In reply to ]
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lanierb wrote:
According to this article, many pros ran very high pressures in Flanders. The article claims Sagan at 105/109psi on 28s, van Aert at 97psi on 28s, Kristoff at 80/87 on 28s. Even without the cobbles I would think something like 70 would be better. With the cobbles I would guess <65. I'm stunned that some pros are doing this. I find myself in such disbelief that I'm wondering if the article is just making stuff up? Anyone have any insights?

Nothing against VN, but I'm going to file this under stuff I read online which I don't believe. I listen to marginal gains podcast (it's awesome BTW if anyone reading doesn't). For pro teams to years and years behind the 8 ball in terms of tire pressure knowledge and tech, I just don't buy it.

My guess is the teams are playing shell games with one another. They have every reason to lie about that guys are running if they have gone to lengths to calculate the optimal pressure which they think gives a rider an advantage over the rest of the field.
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Re: Flanders tire pressures [PBT_2009] [ In reply to ]
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This/\
We often do this on the cyclocross start line, just joking among friends of course but eventually we come across someone who heard us and is actually trying to ride 55 psi on a race course.

rich
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Re: Flanders tire pressures [lanierb] [ In reply to ]
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Based on the work that Joshatsilca did (when he was at Zipp??) and the extremely interesting articles that he wrote, I'd say those seem surprising. A quote from his articles, talking about Paris Roubaix:

"The 28mm tire in the low-mid 60psi range proved to be nearly 1km/hr faster than the 24mm tire with pressure in the mid 70 psi range (which is what is required to prevent bottoming the tire) when the data was normalized for rider power output."

If you haven't read the articles, they're fascinating:


Sorry - can't find part one
Part 2: https://silca.cc/...ures-are-everything#
Part 3: https://silca.cc/...t-created-the-future


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Re: Flanders tire pressures [lanierb] [ In reply to ]
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I'm not super familiar with the Flanders cobbles, but my impression is that most of them are on steep climbs where there are slower speeds. Compare that to Roubaix where the cobbles are generally flat and pros will be hammering them at 30ish mph. I also get the impression that the certain sections of the Rouabix cobbles are just nastier than Flanders...but I could be wrong. Given those differences, I'm wondering if pros are willing to ride the Flanders cobbles with "normal" pressures to benefit on the smooth pavement while going much lower (and wider tires) for Roubaix.

There have been many reports for like the last 5 years of pros using 30+ mm tubulars at Roubaix with pressure under 60 psi. So I'm not totally sure this is just a "misinformation" game.
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Re: Flanders tire pressures [Jason N] [ In reply to ]
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Have been running 28-32s on most all my bikes for the past ten years or so. I don't think it is very likely at pro riders weights to pinch flat a 28 tubular at 80-90psi. 32s at 75 psi seem pretty darn firm. I am 100kg and have never pinched a 28 clincher at 75 psi with some pretty big hits. I sort of grain of salt those numbers, but if that is what they ride that is what they ride.
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Re: Flanders tire pressures [xtrpickels] [ In reply to ]
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was there a vid or link that didnt come thru?

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Re: Flanders tire pressures [lanierb] [ In reply to ]
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That whole article was bullshit.

No way they ride pressures that high.

They didn't even get details right. Some of the tires were clearly marked 25C and they identified them as 28's.
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Re: Flanders tire pressures [asgelle] [ In reply to ]
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Funny enough, I'm here in Lokeren right now with the teams working on this for both races.

What I know for sure is that all the teams are bullshitting to the media (and each other) about pressures and I'm strictly forbidden from discussing numbers between teams in any detail but can tell you first hand that those numbers are not right. We work with EF and Bora officially and a few other teams unofficially and I'm unaware of anybody running 100+ on 28's.. though it wouldn't surprise me if some of the smaller teams are doing stuff like that, I find all sorts of crazy stuff happening in the little teams ;-)

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Re: Flanders tire pressures [joshatsilca] [ In reply to ]
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joshatsilca wrote:
Funny enough, I'm here in Lokeren right now with the teams working on this for both races.

What I know for sure is that all the teams are bullshitting to the media (and each other) about pressures and I'm strictly forbidden from discussing numbers between teams in any detail but can tell you first hand that those numbers are not right. We work with EF and Bora officially and a few other teams unofficially and I'm unaware of anybody running 100+ on 28's.. though it wouldn't surprise me if some of the smaller teams are doing stuff like that, I find all sorts of crazy stuff happening in the little teams ;-)

Nice web site and good luck but $450 for a track pump! Sorry but imho that all that is wrong with cycling. People spending too much on a product with no extra functionality or performance value.

Sorry to be an ass but I'm also sure that even smaller teams can ride pave and put air in/out of a tyres to optimize?
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Re: Flanders tire pressures [NordicSkier] [ In reply to ]
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NordicSkier wrote:
That whole article was bullshit.

No way they ride pressures that high.

They didn't even get details right. Some of the tires were clearly marked 25C and they identified them as 28's.

x2

no f'ing wright they were running 100 or so on 28s


The entire event (IM) is like "death by 1000 cuts" and the best race is minimizing all those cuts and losing less blood than the other guy. - Dev
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Re: Flanders tire pressures [newManUK] [ In reply to ]
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you realize who you are talking to right?
Last edited by: buzz: Apr 10, 19 4:54
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Re: Flanders tire pressures [buzz] [ In reply to ]
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buzz wrote:


you realize who you are talking to right?


Honestly no idea and I don't wish to be an ass. After I looked at the web site it was the first I had heard of the products.

As said good luck to him but the products price point aren't for me

fyi I don't work in the bike industry but however, I know how to pump up a tyre from my track pump. I even managed to change some bits when it stopped working for about £4 without having to replace it. moneysupermarket.com!
Last edited by: newManUK: Apr 10, 19 6:30
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Re: Flanders tire pressures [LuisDF] [ In reply to ]
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Remember that the pressure will drop significantly after 5-6hrs of racing and the changing weather conditions.
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Re: Flanders tire pressures [newManUK] [ In reply to ]
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Silca products are premium and always worth the price.
Yup... some are just too expensive, but to each their own.
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Re: Flanders tire pressures [newManUK] [ In reply to ]
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newManUK wrote:
buzz wrote:


you realize who you are talking to right?


Honestly no idea and I don't wish to be an ass. After I looked at the web site it was the first I had heard of the products.

As said good luck to him but the products price point aren't for me

fyi I don't work in the bike industry but however, I know how to pump up a tyre from my track pump. I even managed to change some bits when it stopped working for about £4 without having to replace it. moneysupermarket.com!

Mr. Dennit, with all due respect, and remember I'm saying it with all due respect, that idea ain't worth a velvet painting of a whale and a dolphin getting it on.
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Re: Flanders tire pressures [newManUK] [ In reply to ]
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newManUK wrote:
As said good luck to him but the products price point aren't for me

Cool, Silca's products are not for you. Don't buy them.

McLaren and Ferrari make expensive cars - their price point is likely not for you either. Does that fact that these companies make expensive products mean that you would dismiss the findings of their aerodynamicists and other engineers?

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Re: Flanders tire pressures [refthimos] [ In reply to ]
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You are correct Ferraris aren't for me. I have cars from Zuffenhusen. Used to make the best cars in the world but now making rubbish 4X4 and reissuing. However that is a discussion for another forum
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