Tubular Corsa G+ Black Walls Latex or Butyl inside?
Moderator: robbosmans
Few months ago i ordered 4 tubular tires Corsa G+ black sidewalls, with part number 111.1.cx.00.25.111tg
Now time to install some of them, and i was a bit suprised that there is almost no air loosing while streching on the rim...
Googling around i realized that there is an offer of Corsa G+ black sidewalls with Butyl instead of Latex inside..
So how to know for sure if my 4 tires are Latex or Butyl version, beside expectint to loose air overnight if they are latex inside?
And what's the story beside this Butyl version? I did not even know that there is that kind of Corsa G+ version...
Declared weight on the label is 290 gm
Now time to install some of them, and i was a bit suprised that there is almost no air loosing while streching on the rim...
Googling around i realized that there is an offer of Corsa G+ black sidewalls with Butyl instead of Latex inside..
So how to know for sure if my 4 tires are Latex or Butyl version, beside expectint to loose air overnight if they are latex inside?
And what's the story beside this Butyl version? I did not even know that there is that kind of Corsa G+ version...
Declared weight on the label is 290 gm
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I can't help you but....
A while ago Vittoria used to make a triathlon variant with butyl tubes so that athletes could rack their bikes overnight without too much pressure loss.
Josh Poertner stated on one of his podcasts (I think) that Vittoria are adding graphene to latex tubes to improve air retention.
I truly hope they aren't switching wholesale to butyl - one of the last key selling points of tubs would be lost.
A while ago Vittoria used to make a triathlon variant with butyl tubes so that athletes could rack their bikes overnight without too much pressure loss.
Josh Poertner stated on one of his podcasts (I think) that Vittoria are adding graphene to latex tubes to improve air retention.
I truly hope they aren't switching wholesale to butyl - one of the last key selling points of tubs would be lost.
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My clincher Vittoria Corsa G2.0 tan wall also reduce pressure loss rate of my latex tube.
I pulled out Continental GP5000 and replace with Corsa G2.0 re-using same old latex tube.
At first the pressure loss was almost normal. Then after a rain ride, i noticed that the latex tube loss pressure much less than usual.
I'm curious so i inspect and found out that the latex tube kinda stick into the Cotton. And, unlike Corsa G+, the Corsa G2.0's cotton appear to have some extra coating on top. I think that coating is some what airtight. Then what happen when tire is somewhat airtight, and rim is almost airtight (except at the valve)? I almost create a pseudo tubeless set-up...
I'm curious, on tubular set-up, can't they just make it air tight without any tube inside the tire, using the same coating that they use for tubeless version?
I pulled out Continental GP5000 and replace with Corsa G2.0 re-using same old latex tube.
At first the pressure loss was almost normal. Then after a rain ride, i noticed that the latex tube loss pressure much less than usual.
I'm curious so i inspect and found out that the latex tube kinda stick into the Cotton. And, unlike Corsa G+, the Corsa G2.0's cotton appear to have some extra coating on top. I think that coating is some what airtight. Then what happen when tire is somewhat airtight, and rim is almost airtight (except at the valve)? I almost create a pseudo tubeless set-up...
I'm curious, on tubular set-up, can't they just make it air tight without any tube inside the tire, using the same coating that they use for tubeless version?
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Seems like they still do: https://www.vittoria.com/us/triathlon-s ... -race.htmlpetromyzon wrote: ↑Fri Jul 19, 2019 8:47 amA while ago Vittoria used to make a triathlon variant with butyl tubes so that athletes could rack their bikes overnight without too much pressure loss.
You're lucky they hold on that long. Mine would lose 10PSI after a long day in the saddle. Never going with Latex-tubed-tubulars again.
I have better luck with latex tubes in clinchers. They take over a week to go flat. Probably because they are thicker than the tubes in tubs.
I don’t mind pumping my tires up before every ride. It’s just something that’s part of my pre-ride check now.
I don’t mind pumping my tires up before every ride. It’s just something that’s part of my pre-ride check now.
2010 Orbea Opal 54cm
5.97kg
5.97kg
Riding a tubular with a butyl tube sounds backwards. The benefits of tubular tires are the soft/plush ride from the latex inner and sew up construction. The only time I opted for a butyl tube, was when I got a bunch of tubular tires repaired by Tire Doctor in FL. This was to make these repaired tires spares, in the event I got an on road flat.. This is the reason why I'll never run GP4000 tubular tires or conti gatorskins tubular tires. What's the point of riding crappy tubular tires on good wheels. You don't buy a sports car and put Nankang tires on it!
Pumping your tubular tires up before a ride, when they lose air is actually a good thing. This way you can pre-check your tires for gashes or cuts before you ride..
Rob English "Mudfoot" 29er | Focus Izalco Max | Firefly #194 Stainless XCR | Firefly #277 | Neilpryde Bura SL 11.9 | Crust Evasion Lite
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Does a small amount (15-20mL) of sealant help retaining air in latex inner tube?
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