what is the widest 700C latex tube and from where

[The utility cyclist]

Looking for some wide latex tubes, the tyres are 37mm when inflated to 55psi, I've already got a nice Bontrager tube that is light enough at 124g and is a proper width tube for that size (not undersized/overly stretched) but would like to give some latex tubes a try.

I've seen some Vittoria ones for £7 that are described as 25-28mm which could be useful for other tyres but struggling to find something wider, the rim is only 21mm deep so don't need a long valve.

Anyone have any leads as to something a bit wider.

[Samuel D]

Michelin AirComp C4? Designed for a 26" tyre but latex is highly stretchy stuff. Weight would be around 130 g but with lower rolling resistance than a butyl tube.

[andrew_s]

Challenge 700x29-38. Expensive
https://www.sigmasports.com/item/Challe ... -38mm/BXZP
You might also look at Foss tubes. (also expensive)
http://www.foss.com.tw/inner-tube.html
https://www.probikeshop.com/en/gb/foss- ... 08506.html

[Eman Resu]

The Utility Cyclist, I have two of the up to 38 mm Challenge latex inner tubes lying around if you're interested. Can swap for a 27.2 seat post or old rear rack?

[The utility cyclist]

The Utility Cyclist, I have two of the up to 38 mm Challenge latex inner tubes lying around if you're interested. Can swap for a 27.2 seat post or old rear rack?

ooo, that might be an idea, I have a black suspension post that's hardly been used or I could swap that out with an ordinary black alloy post from a bike I'm selling that's in really good condition if either might be of interest? I'd have to have a dig in the garage to see if I have a rack, presuming for 700C/27"?
How much otherwise/condition?

[The utility cyclist]

Michelin AirComp C4? Designed for a 26" tyre but latex is highly stretchy stuff. Weight would be around 130 g but with lower rolling resistance than a butyl tube.

Was reading on a CX website and they'd said they'd used the vittoria 25-28mm jobs in a 37mm tyre no problem, just worried that might be pushing it for that size tyre at higher pressures (55max) compared to the 25/30psi these guys were running at?

[andrew_s]

Higher pressure doesn't really affect much other than the size of tyre cut that will cause a burst.
If a tube is inside a tyre, it can't stretch bigger than the tyre, and if you've ever pumped a tube outside a tyre, you'll know how big they can get before bursting.

A stretched tube will puncture faster than a relatively unstretched tube, both in terms of going flat quicker when there is a puncture, and in terms of chafing through faster if there's something rough inside the tyre.

[Samuel D]

I agree with andrew_s but note that I’m suggesting the use of a fat mountain bike tube, albeit a 26" one. That would have to be stretched only slightly in length to work in your 700C tyre. It looks like Michelin recently made it fatter (following the trend to wider tyres, I suppose), so ideally you’d find the older, narrower one in stock. It’s still widely available.

[NATURAL ANKLING]

Hi,
Have things changed over the years?
Last time I tried latex I lost two weeks air in just one day

[Eman Resu]

For the utilitycyclist. Some photos of the latex innertubes. The challenge ones (orange/pink) are 30-35 mm but I've used them on 37 mm tyres. The cream coloured one is from an old wide tubular tyre

latex2.jpg (38.4 KiB) Viewed 811 times

latex1.jpg (46.32 KiB) Viewed 811 times

[andrew_s]

I agree with andrew_s but note that I’m suggesting the use of a fat mountain bike tube, albeit a 26" one. That would have to be stretched only slightly in length to work in your 700C tyre. It looks like Michelin recently made it fatter (following the trend to wider tyres, I suppose), so ideally you’d find the older, narrower one in stock. It’s still widely available.

The awkwardness of a 26" tube in a 700c wheel is that when you are fitting the tube, it hugs the well of the rim, and it's easy to get the tube trapped under the tyre bead.
(speaking as someone who, out on the road, got the boxed Michelin A2 tube (700x25-32) out of the Carradice, and found a 650c x 18-23 long valve tube inside)