Tube size
 

I'm pretty new to the biking world, and have no idea what size tubes to buy for my tires. The only numbers on the the wheel is 622x15. Does that tell what I need to know?

That tells you the rim size; what about the size listed on your tires?

I'm assuming they're something like a 700x23. Whatever they are, you would buy the tube based on that size. So the tube would probably be "700x19-23"

ah yes, the tires say 700-20. Can't beleive I didn't see that before, thanks!