The Legitimiser
Join Date: Jul 2005
Location: Southampton, UK
Posts: 4,849
Bikes: Gazelle Trim Trophy, EG Bates Track Bike, HR Bates Cantiflex bike, Nigel Dean fixed gear conversion, Raleigh Royal, Falcon Westminster.
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My guess is that the geometry of 20" wheeled bikes is somewhat different, to allow them to retain at least some of the BB clearance, but also that most are delivered with shorter cranks as well. I am definitely only guessing though.