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Old 2018-03-12, 03:39 AM   #31
JimT
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Quote:
Originally Posted by lightbulbjim View Post
Thanks! What's the diameter of the valve stem on the new tube? I currently have a Foss tube on my 36er but was under the impression that the standard rubber tube had a thicker valve stem.

I don't suppose anybody knows the weight of a 36" Foss tube off the top of their head? On UDC it just says "30% lighter than a standard tube", but it would be good to have some real world numbers.....
The Foss tube weighs 247g / .54lb per the UDC site. The new tube weighs 220g. That's a little less then 1oz lighter. Weight is kind of a trade off. I guess it boils down to holding air better in the new Butyl tube or the self sealing capability of a Foss.

You can get a Schrader-Presta, rubber rim hole adapter online or from your LBS. So a new smaller hole does not have the be drilled in the rim.

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Old 2018-03-12, 04:42 AM   #32
lightbulbjim
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Quote:
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The Foss tube weighs 247g / .54lb per the UDC site. The new tube weighs 220g. That's a little less then 1oz lighter. Weight is kind of a trade off. I guess it boils down to holding air better in the new Butyl tube or the self sealing capability of a Foss.

You can get a Schrader-Presta, rubber rim hole adapter online or from your LBS. So a new smaller hole does not have the be drilled in the rim.

Jim
Thanks. I've seen those adapters, and that's probably the way I would go.
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Old 2018-03-12, 09:53 PM   #33
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Vee rubber 36er tube weight update!

The claimed weight on every website I've checked indicate 220 grams. The weight I kept coming up with was a bit under 340 grams. That's a pretty big difference. I called the Vee rubber company here in the US and ask them if they could confirm the actual weight and they responded fairly quickly saying it was indeed 330 grams. This is still less than half the weight of the original butyl rubber 36er tube which weighs in at 709g. So although it turned out that it's not 220 grams, 330g isn't bad.
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Old 2018-03-12, 10:24 PM   #34
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Interesting. The weight increase over a Foss tube is probably still worth it for the ease of roadside repair.
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Old 2018-03-13, 01:45 AM   #35
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Originally Posted by lightbulbjim View Post
Interesting. The weight increase over a Foss tube is probably still worth it for the ease of roadside repair.
Since there was a 120 gram discrepancy between the claimed weight and actual weight of the Vee rubber 36er tube, someone with a 36er clear tube/FOSS should get an accurate weight to make sure that the claimed weight on various web sites is correct.
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Old 2018-03-13, 05:33 AM   #36
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So, finally, the michelin butyl 700x35/47 tube, which works like a charm, is about half of the lightest 36er tube's weight, with 170 grams.
Maybe even lighter than a tubeless setting with all the sealant you have to put in?

Is there any lighter combination than the 170 gm tube + 1400gm (or less with luck) combo?

Mine is not the lightest though, since it's on a geared 36er.
But thanks to the 150mm cranks a geared hub allows, the saved weight helps a lot on uphills and accelerations in the 0-13 mph range in low gear, it's also noticeably easier to control in high gear when the floor is a bit bumpy (micro corrections are easier) and the tire profile is rather road camber friendly.

That sounds like a win/win to me.
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Old 2018-03-13, 06:36 AM   #37
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So, finally, the michelin butyl 700x35/47 tube, which works like a charm, is about half of the lightest 36er tube's weight, with 170 grams.
Maybe even lighter than a tubeless setting with all the sealant you have to put in?

Is there any lighter combination than the 170 gm tube + 1400gm (or less with luck) combo?

Mine is not the lightest though, since it's on a geared 36er.
But thanks to the 150mm cranks a geared hub allows, the saved weight helps a lot on uphills and accelerations in the 0-13 mph range in low gear, it's also noticeably easier to control in high gear when the floor is a bit bumpy (micro corrections are easier) and the tire profile is rather road camber friendly.

That sounds like a win/win to me.
Sounds very exciting. I want one.
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Old 2018-03-13, 07:45 AM   #38
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I just weighed a Foss 36 tube at 239 grams. Without the box but including the two rubber bands.
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Old 2018-03-13, 07:47 AM   #39
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I measured the Foss tube with 240gr. So it seems they put the correct weight on the websites.

My 36 nightrider light tire was just 1300 gr. As for the total weight: I am considering to set the nightrider light tubeless (will probably take a while). If I go for that setup, I will post some weights.
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Old 2018-03-13, 12:53 PM   #40
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Edit: the michelin 170gm tube weights about half of the lightest NON FOSS 36er tube.
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Old 2018-03-13, 06:53 PM   #41
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I was thinking of trying tubeless when I eventually get the new tyre.

A bolt-in valve, a wrap of Tesa 4289 tape and 150% the amount of Stan's for a 26er tyre should come in at less than 120g. Shouldn't need more than that because I doubt there will be any weeping through the sidewalls.

I don't foresee any burping issues because of the relatively high pressures involved.

I added a tip here for easy tubeless inflation techniques if anyone wants to give it a go before I do. Use your car tyre as a pressure reservoir!
http://unicyclist.com/forums/showthr...88#post1694088

Last edited by rich; 2018-03-13 at 06:55 PM.
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