Tube size vs tyre size

General Help
1

Question- I have a 28c tyre, I have a 23c small tube, and a larger 28-30c+ CX tube. I don’t have a perfect ‘28c tube’.

What is better- use the smaller tube and have it stretch out more, or use the CX tube and hopefully not have it ‘wrinkle’ inside?

Thanks

2

either will work fine, have done it heaps.

The 28-32 tube is actually designed for 28c tyres.

edit: actually I think the tubes in my 28c tyres are probably 28-35’s and maybe some 25-32’s in my 42c tyres.

Whatever

3

I use a 19-25mm tube in a 28c Rando with no problems at all.

4

Use the larger tube.

The smaller tube will work but will be more likely to flat as it will be stretched thinner.

But you never flat, right?

5

always smaller to upset blakey

6

Just run tubs.

7

Thanks, that was my initial thinking.
One problem I found with the bigger tubes is they tend to wrinkle inside, as though the tube is a slightly bigger diameter than the tyre- what’s that about?