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would i be able to get a shim to make it fit?
Probably not. This replacement headset might work however according to this chart. But I'm not sure. You'd be taking a punt. It seems to be that the Cannondale headtube has the same size bore as 'oversize' headtubes that existing headsets for 1.5" steerers are designed for. These might work your frame.
is it possible the frame seller is correct and the headset fitted will take a 1.5 fork (rather than 1.56)?
It's possible but unlikely - looking at the photos I'm pretty much certain the frame has the headshok headset. Folks used to describe the Cannondale standard as 1.5" because 1.5" didn't exist back then. Now that it does, some folks haven't realised that they are two different things and are still using 1.5" to describe 1.56".
The question to ask the seller is: "can I fit a headshok fork with the existing headset without adapters and whatnot?"
can you link the reducer cups/reducer headset I'd need for some 1/8 forks and tapered forks? (i'm after rigid ones)
Reducer - drop in to existing headset. Takes 1-1/8th straight forks.
Headset tapered - takes tapered 1-1/8th to 1.5" forks
also - thanks loads and loads for your help!
No problem.
would i be able to get a shim to make it fit?
is it possible the frame seller is correct and the headset fitted will take a 1.5 fork (rather than 1.56)?
can you link the reducer cups/reducer headset I'd need for some 1/8 forks and tapered forks? (i'm after rigid ones)
also - thanks loads and loads for your help!