Originally Posted by
Duragrouch
If it's a rebadged Dahon 20" folder...
Bickerton Portable, 1971~1989:
Front wheel: ISO298 (14x1 3/8)
Rear wheel: ISO349mm (16x1 3/8)
Tires in the ISO298 size have become rare since the 1971 design date. The Bickerton Portable intelligentsia has begun rebuilding their front wheels in common ISO305.
Modern bikes with Bickerton badging have been manufactured by Tern for several years.