Thick question on 700*40C tubes


Über Member
got my new hydrid bike and want to get some spare tubes if ever the P word should occur.

There doesn't seem to be much about for tube sizes for that tyre.

Will a 700*28/42 tube be ok or will it be a tad small? I'm assuming the 28/42 is a range of widths?

Is there a better width tube to get.

Paul_L, 700 x 28/42 means that its a tube suitable 700mm diameter tyres with widths of between 28 and 42mm, you assume correctly; you'll be fine with those tubes :-)


New Member
It does seem that tubes for hybrid sizes are few and far between. It's not that the manufacturers don't supply them, rather that the shops don't seem to stock them! I can only assume it's a demand thing, but then I'd thought we're way past hybrids being something of a niche market.

I've got 700x45c and, relatively speaking, struggled to get a replacement tube (caveat: I was only looking online) - they were 'special order' at a number of places. Got one off the shelf in the end though.

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