Originally Posted by
curbtender
If you don't need to stay original, yes, find a cheap donor bike. You just need to match the axle size.
That's IF you opt to swap wheels. To answer the original question, [MENTION=487440]Limper[/MENTION], your tires probably say 20 x 1 3/4". That's the old Schwinn juvenile 20", with an ISO 419 diameter. Here's a Sunlite brand on Amazon -
https://www.amazon.com/dp/B000AO9OVW/ . Kenda makes one as well -
https://www.bmxguru.com/products/ken...l-black-47-419 .