If a frame starts with 1" threaded forks, can it easily be changed to the later 1 1/8" non threaded (i.e is it just a case of replacing the complete headset with cups aswell?)
Also, how do i tell if a frame is for which fork size as i have a spare frame which will take both sizes (the cups are still in the frame) obviously the larger threadless forks are a snug fit to start with...without bearings etc..
Sorry if its a stupid question....