I have an 18 speed and want to swap the wheels out, but the new rear wheel has an 8-sprocket cassette and the one on the bike has a 6-sprocket . I plan on swapping them but just for fun I tested it out without swapping them and the 8-sprocket rides just fine even though two of the sprockets will never be used.
Would it cause problems to ride with the 8-sprocket or can I just leave it on and won't experience any differences?