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I've got a 20x1.5 tire. Would I be better off getting a 20 x 1.25-1.5 inner tube or a 20 x 1.5-1.75 inner tube?

Tokyo Disneyland folding bike riders feel free to chime in with what sizes you're rocking, I'm all for maximum spare part compatibility. I've that 20x1.5-1.75s will fit a 24 x 1.4-1.75.

On another bike I've been rolling with a 700x20-25 tube (long stem presta - damn deep Vs) on a 28 with no ill effects so my wild guess is go with the 1.25-1.5. Better to have stretched rubber than a jammed in , but what do I know? On the other hand, 20s seem to go up to 2.3 wide so maybe the larger tube would be handy if the tire goes to hell and I need to slap on a new, more readily available(?), wider one.

The tires are Schwalbe Marathon Racers for what it's worth.

Have you heard the phrase "rearranging the deck chairs on the Titanic"?

Seriously, though, it's better to stretch a smaller one strictly because a larger one is more likely to get dinged by your tire lever. Ideally, you should use a tire you can put on by hand, but you're using Schwobblies, so you'll be using at least one lever, if not more.

Get the smaller tubes.

I just got home with the Dahon D7 I bought in California. It's got 20x1.5 tires. WooHoo!

About tube size:

Too small is absolutely better than too big.
An over sized tube is hard to get positioned in the tire, and is more or less a guaranteed pinch-flat. A small tube has no trouble expanding safely.

That said, the tubes you're considering are both the right size. Either would work fine.
I tend to go small for my spares because I find it easer to get the tubes positioned when i'm working in the dark on the side of the road.

I don't remember posting that.

No, really.


yay beer.