Senior Member
Join Date: Feb 2006
Location: Sin City, Nevada
Posts: 2,886
Bikes: Catrike 700, Greenspeed GTO trike, , Linear LWB recumbent, Haluzak Horizon SWB recumbent, Balance 450 MTB, Cannondale SM800 Beast of the East
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Pick a different bike. Yes, you can change the front wheel on a recumbent bike but probably not without replacing the front fork. If you went from a 16" wheel to a 20" wheel but kept the original fork the tire is likely to rub on the fork and you might get interference with the cranks (heel strike). I wouldn't mess with the geometry of the bike as it also may cause instability.