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PostPosted: Wed May 29, 2013 11:42 pm 
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Tubbie Guru

Joined: Tue May 03, 2005 2:20 am
Posts: 5838
Location: Belgium
Hi,

Quote:
Latex has very low hysteresis, and butyl very high. Making a butyl tube very thin will certainly help reduce the losses, but even a thick latex tube has close to zero.


Exactly.
Latex is so much more supple than butyl it will always show lower rolling resistance and as a side effect (so to speak) will lower puncture risk as well due to its ability to conform around an object.
Latex inner tubes can have a very high lifetime, can be patched as easily as butyl, can weigh about 40% less and increase comfort as well. Ask anyone that rides decent tubulars, comfort contributes to efficiency no end.

The better latex inner tubes are invariably the unpigmented ones as the addition of pigment reduces the flexibility of the material no end.

Want a great tyre? Forget about anti-puncture belts, go silk casing with high tpi count and a fine latex inner tube.
I'm pretty sure it won't puncture that easily and will be way faster and lighter than anything else out there.

Anything else is just plain marketing bullshit really.

Ciao, ;)

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PostPosted: Wed May 29, 2013 11:58 pm 
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in the industry
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Joined: Sun Jul 29, 2012 2:59 pm
Posts: 832
Location: Ruidoso, NM
I bought some Vred latex tubes 6 years ago. Turns out they were thick heavy ones... like 100g. I'm still using them on the TT bike.

IME latex patches more easily than butyl. I uses pieces of an old tube and Elmers rubber cement.

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formerly rruff...


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PostPosted: Thu May 30, 2013 1:17 am 
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Joined: Tue Aug 02, 2011 9:20 pm
Posts: 1586
Location: New Zealand
WMW wrote:
I bought some Vred latex tubes 6 years ago. Turns out they were thick heavy ones... like 100g. I'm still using them on the TT bike.

IME latex patches more easily than butyl. I uses pieces of an old tube and Elmers rubber cement.


Are they creamy natural pigment or black? Were the Vred latex tubes natural pigement even six years ago? All of the ones I have bought are natural pigement and weighed no more than 50g each so I think you may have got ripped there. 100g sure ain't latex

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PostPosted: Thu May 30, 2013 3:10 am 
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in the industry
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Joined: Sun Jul 29, 2012 2:59 pm
Posts: 832
Location: Ruidoso, NM
Natural color. Definitely latex. I checked them for Crr today and it's as low as the thin latex. Both are ~25% less resistance than a 90g butyl tube in a 23mm Supersonic.

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formerly rruff...


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PostPosted: Fri May 31, 2013 10:41 pm 
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Joined: Mon Jul 27, 2009 6:55 pm
Posts: 133
Location: North Carolina, USA
Good to know the Vredestein tubes work just fine in 24 or 25 mm tires. I'm using mine with 23s right now but would like to try some 25mms next time I need new tires.

Mine are the unpigmented ones, got them for about $10 each shipped from UK to U.S. Not stocked in my LBSs.

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PostPosted: Sat Jun 01, 2013 12:01 am 
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Joined: Sat Mar 06, 2010 10:34 pm
Posts: 356
I have been running verds with veloflex tires for a few months now. I was running mich tubes for about a year. But i now prefer the verds. They are a few grams lighter. The mich tubes seem more susceptible to flats. My only complaint with the verds is that they do stretch out a bit and dont exactly fit when you go to re install them. I get a bunch of excess tube that has to be crammed into the tire. I did ride the rouge roubaix this year with some verds and gatorskin 25s. 104 miles of pavement and gravel.


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PostPosted: Sat Jun 01, 2013 9:40 am 
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Joined: Fri Aug 10, 2012 11:54 am
Posts: 128
I was switching my tyres as I have a long sportive coming up and had been puncturing quite a bit recently on my Vittoria tyres so changing to GP4000s. The Vredestein tubes had indentations on the rim side when I took them out. Is that normal for latex?


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PostPosted: Sat Jun 01, 2013 2:21 pm 
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Joined: Wed Sep 26, 2007 1:57 pm
Posts: 7892
Location: San Francisco, CA
Yes.

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PostPosted: Sun Jun 02, 2013 6:29 pm 
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in the industry
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Joined: Fri Jan 23, 2004 6:31 pm
Posts: 356
With Conti making 50g rubber tubes, why would anyone be interested in Latex$$$?

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PostPosted: Sun Jun 02, 2013 7:28 pm 
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Joined: Mon Apr 19, 2010 10:33 pm
Posts: 167
Latex offers lower rolling resistance. That due to its properties not its weight. A tire wioth a heavier latex tube will be faster than a tire with a lighter butyl tube.


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PostPosted: Sun Jun 02, 2013 9:30 pm 
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Joined: Fri Jan 23, 2004 6:31 pm
Posts: 356
Not compelling enough but thanks for the reasoning. I have low enough rolling resistance using wider Zipp and Enve clinchers so I'll count my blessings.

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PostPosted: Mon Jun 03, 2013 12:10 am 
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Joined: Fri Nov 18, 2011 5:19 am
Posts: 862
So don't use latex.


Those conti tubes won't ride as nice


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PostPosted: Mon Jun 03, 2013 1:21 am 
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Tubbie Guru

Joined: Tue May 03, 2005 2:20 am
Posts: 5838
Location: Belgium
Hi,

carbonLORD wrote:
With Conti making 50g rubber tubes, why would anyone be interested in Latex$$$?


Have you really thought this through?

Oh, I see, you're in the industry. I assume that's the same industry that's after everyone's money?

Enjoy as many flats as you can muster, ;)

Ciao, ;)

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PostPosted: Mon Jun 03, 2013 1:21 am 
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in the industry
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Joined: Sun Jul 29, 2012 2:59 pm
Posts: 832
Location: Ruidoso, NM
carbonLORD wrote:
Not compelling enough but thanks for the reasoning. I have low enough rolling resistance using wider Zipp and Enve clinchers so I'll count my blessings.


Rims don't lower rolling resistance...

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PostPosted: Mon Jun 03, 2013 8:17 am 
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Joined: Sat Apr 26, 2008 10:44 pm
Posts: 144
Location: Holland/Belgium
http://flocycling.blogspot.be/2011/11/f ... er-is.html


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