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PostPosted: Wed Jun 12, 2013 11:26 pm 
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Joined: Tue May 03, 2005 2:20 am
Posts: 5837
Location: Belgium
Hi,

In what way does the addition of talcum powder reduce rolling resistance?

TA, ;)

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PostPosted: Thu Jun 13, 2013 12:58 am 
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Joined: Tue Aug 02, 2011 9:20 pm
Posts: 1570
Location: New Zealand
fdegrove wrote:
Hi,

In what way does the addition of talcum powder reduce rolling resistance?

TA, ;)


You know what, I have no idea if it does reduce rolling resistance. I've just always done it after been told by my Dad, various other racers and also mechanics etc doing this with tubes at various shops. :noidea:

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PostPosted: Thu Jun 13, 2013 5:16 pm 
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in the industry
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Posts: 829
Location: Ruidoso, NM
fdegrove wrote:
In what way does the addition of talcum powder reduce rolling resistance?


Doesn't... just make it easier to do a good install and removal.

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PostPosted: Fri Jun 14, 2013 3:38 pm 
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Joined: Thu Dec 01, 2011 4:59 pm
Posts: 58
Eclipse Road Superlight Inner Tube, a claimed 29 grams....

Don't know if they are latex or not though but still without a doubt the lightest tube I've ever heard of. They aint cheap at £40 a pop though.
(http://www.wiggle.co.uk/eclipse-road-su ... nner-tube/)


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PostPosted: Fri Jun 14, 2013 3:56 pm 
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Posts: 614
Location: Austin, TX
weeshuggy wrote:
Eclipse Road Superlight Inner Tube, a claimed 29 grams....

Don't know if they are latex or not though but still without a doubt the lightest tube I've ever heard of. They aint cheap at £40 a pop though.
(http://www.wiggle.co.uk/eclipse-road-su ... nner-tube/" onclick="window.open(this.href);return false;)


Their press release says they are made of a "special plastic".

http://www.eclipse.ch/new/Press.html

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PostPosted: Fri Jun 14, 2013 4:09 pm 
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Location: Houston, Texas
WMW wrote:
Doesn't... just make it easier to do a good install and removal.
This was also something I also have done over the last 30-years but having disassembled thoroughly warn/punctured Veloflex road and FMB cross tubulars, I noted that both had a talc-like powder residue inside. Also wanted to add that in hot/humid climates like we have hear near the Texas Gulf Coast, in the summer time (May-September :roll:), road temps often exceed 120+ degrees and adding talc helps keep the latex from sticking to the tire carcass. As for rolling resistance, I have always gotten the impression it helps by allowing the inner tube some 'wiggle' room inside the tire.

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PostPosted: Fri Jun 14, 2013 11:28 pm 
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Joined: Tue May 03, 2005 2:20 am
Posts: 5837
Location: Belgium
Hi,

Quote:
This was also something I also have done over the last 30-years but having disassembled thoroughly warn/punctured Veloflex road and FMB cross tubulars, I noted that both had a talc-like powder residue inside


Seen that too but not recently. My guess is that the manufacturer hoped the fine talcum powder inside the inner tube would somehow reduce the porosity of latex hence helping to keep its pressure longer.

Quote:
Also wanted to add that in hot/humid climates like we have hear near the Texas Gulf Coast, in the summer time (May-September :roll:), road temps often exceed 120+ degrees and adding talc helps keep the latex from sticking to the tire carcass. As for rolling resistance, I have always gotten the impression it helps by allowing the inner tube some 'wiggle' room inside the tire


Does it matter one bit if or not the inner tubes sticks to the casing? I don't think so as an inner tube doesn't move with respect to a casing. How could it?

Quote:
Their press release says they are made of a "special plastic".


Yeah. If it would be half as good as it sounds to be we'd all be using by now. :mrgreen:

Ciao, ;)

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PostPosted: Sat Jun 15, 2013 1:40 pm 
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Joined: Sat Apr 26, 2008 10:44 pm
Posts: 143
Location: Holland/Belgium
I always thought it was to make the tube able to move (don't stick to the tire).
So wenn you inflate the tube it will spread better in the tire. That helps to keep the wall thickness evenly spread and so giving the lowest possible rolling resistance.


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PostPosted: Sat Jun 15, 2013 11:17 pm 
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Tubbie Guru

Joined: Tue May 03, 2005 2:20 am
Posts: 5837
Location: Belgium
Hi,

Using talcum powder to make it easier to mount the inner tube, yes. But that won't lower the rolling resistance of a tyre.

Try to use it sparingly as when talcum powder gets wet it tends to caulk.

Ciao, ;)

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PostPosted: Mon Jun 24, 2013 9:49 pm 
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Joined: Mon Jul 27, 2009 6:55 pm
Posts: 132
Location: North Carolina, USA
I swapped some tires around over the weekend.

Vredestein latex tubes (20/25) in Veloflex Paves (23) on Mavic Open Pro rims. Tubes went in very nicely and evenly, perfect size, easy as mounting up butyl tubes. Very nice ride quality, though on this wheelset Vittoria Corsas CXs seemed slightly smoother. Could be in my mind!

Vredestein latex tubes (20/25) in Veloflex Master (22) on Mavic Ksyrium SL rims. Same thing, very, very easy to mount. Haven't ridden them yet.

It's been noted before, but I had a great deal more trouble with Michelin latex tubes. They just seem too big for 22 or 23 mm tires, I always seem to get a bunched up spot.

I did get my first flat on Friday (solstice ride!) on Vredestein tubes. A slow leak, no blowout, which is better than the other option. Now I just need to find someone with some latex pieces I can have, as I'm reluctant to cut up a tube with one pinprick hole to get some patches. Nobody I ride with has any, nor do any of the LBS. I guess I'm in butyl country!

Oh, and I've been trying to mount Vittoria Open Corsa tires on some older Campagnolo Delta Strada rims. Wow, those rims don't seem to like any tires, it's always, always a major PITA, er PITThumbs.

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PostPosted: Mon Jun 24, 2013 9:55 pm 
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Joined: Mon Nov 01, 2004 3:13 pm
Posts: 617
Location: Netherlands
Vulcanizing patches like Rema Tip Top work just as well for latex tubes as for butyl.

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PostPosted: Tue Jun 25, 2013 12:35 am 
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Tubbie Guru

Joined: Tue May 03, 2005 2:20 am
Posts: 5837
Location: Belgium
Hi,

Quote:
Vulcanizing patches like Rema Tip Top work just as well for latex tubes as for butyl.


It works but then you find yourself with Half a Nelson.

Anyone use their brain any more?

Goodbye and good night, ;)

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PostPosted: Mon Jul 15, 2013 3:23 pm 
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Joined: Wed Dec 15, 2010 10:32 am
Posts: 429
Location: Estonia
Problem with Vredestein latex tube.
It looses air during night and in the morning it´s empty, but it does not happen every night. Remounted it and put it under water - no bubbles.
Any ideas?

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PostPosted: Mon Jul 15, 2013 4:26 pm 
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Joined: Tue Jan 23, 2007 12:36 am
Posts: 170
Location: Belgium
You mean totally empty, not pressure drop?


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PostPosted: Mon Jul 15, 2013 5:24 pm 
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Joined: Wed Dec 15, 2010 10:32 am
Posts: 429
Location: Estonia
Not totally empty, but almost. It´s not the usual latex tube air loss.

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Domane
Ethic 29er


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