There's quite a few decent tire choices for 20" wheels. Even tubeless!
Yes, the tire choices for 406 wheels are great. But 20" as a short hand tends to translate to three different wheel sizes, if not more. Before buying a second hand bike you should ideally make sure it takes the 406 variety.
@Muppetteer started
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There's quite a few decent tire choices for 20" wheels. Even tubeless!