Sold wrong inner tube ?

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Joined: Fri May 23, 2008 6:42 pm

Sold wrong inner tube ?

Postby deagles » Fri May 23, 2008 6:50 pm

I'm back on 2 wheels for the first time in about 20 years - and a few things appear to have changed - so I need some help please !!

I've got a flat on my hybrid. The tyre size printed is 700x35 - and I have been sold a tube that has a box marked as "700x18/23 40" (price tag says 700x19C 40mm).

Gut feel is it's too small. Can some please confirm if I've been sold the wrong size tube ?


Postby MountGower » Fri May 23, 2008 7:07 pm

G'day deagles

You can go a little too small but I wouldn't go that far. If it said 28/32, I'd use it, but I think that is definately too small. I can't see you having a problem exchanging it, regardless of who's error it is.

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Postby vitualis » Fri May 23, 2008 9:54 pm

Yes, the tube is too small.

700x18/23 40 I would assume mean a tube that will fit a tyre that is 700C 18-23 mm width with a 40 mm length valve. The price tag: 700Cx19C 40 mm basically states the same thing (but saying that it will fit a 700C 19mm width tyre... which is within the range).

Michael Tam
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Postby deagles » Sat May 24, 2008 3:07 pm

Thanks to both of you for confirming my suspicions and thanks to vitualis for deciphering the last part of the numbers. I returned it today for the correct size.

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Postby alchemist » Sat May 24, 2008 4:20 pm

700x19 is small, but will work fine. I end up using these in my 'cross bike running 35mm tyres most of the time as it saves me having to remember to have spares of different size of tubes. I do find them a little more prone to pinch flats, but no difference in punctures.

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