Confirming
The Curl is a ISO 349 Wheel which is considered a 16" wheel as a ISO 305 also is considered. Brompton is a ISO 349 in my understanding as well.
Dahon built, Ford SST is a ISO 355 wheel which I have seen considered a 18" wheel. Very little difference size wise between 349 and 355 vis a vis the 305 to 349 16" relation.
Similar spread on 20" wheels. Most are ISO 406. ISO 451 still are referred to as 20/451, while ISO 406 are normally referred to as 20".
Always watch the ISO number. Its critical.
Last edited by L Arnold; 11-28-17 at 07:33 PM.
Reason: clarification