Just a word on the number of speeds. You can't just run 10 speed one day and then use a wheel with 9 speeds the next.

Your bike has 10 speeds on the rear wheel and the shifter is designed to pull just the right amount of cable to move the chain from one cog to another. The spacing between the cogs are different for 9, 10, and 11 speeds. The more cogs the closer the spacing. When the seller said it has 10 speeds but you can run 11 speeds, that means that the rear freehub will accept 11 speeds, but you will have to swap out the shifters, chain, and probably the rear derailleur.

Same goes with your 9 speed wheel, except you might be able to use the current rear derailleur. But you'll still need 9 speed shifters and probably a 9 speed chain.

John