Just ordered up a rear tire for my CA77 when it's ready 3.50x16. Unfortunately not very good reviews for this company but had no trouble with my order and quick postal time.
http://www.tirendo.co.uk/product/D-M650 ... 12224227:s
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Latest Registry Entry
1965 Honda CP77 — Ulsan Metro City, Rep. Korea
Restored with original parts — Owner: J. Doe