Old cannondale

[24pouces]

(double)

 

[24pouces]

(re-double)

 

[spudgun]

I have kept all the original parts off it,cantis,chainset and pedals.Ritchey seatpost,only saddle missing,have the pedals as well somewhere.I think first off bikes are for riding.This is how I ride at the moment

 

[spudgun]

It's 17" centre to centre,19.5 centre to top

 

[David Gibson]

Any idea how it would ride with a suspension fork instead of the flexstem?

I used to own of these and installed an amp fork and removed the flex stem back in 1992. I thought it rode great...although my standards were a lot lower back then.

 

[24pouces]

It's 17" centre to centre,19.5 centre to top

Yes, but it's a 19"
On the Cannondale EST frame, you have only 3 size : 17", 19", and 21.
But the seattube are all 19,5" centre to top, because of the rear suspension

For recognize the size of an EST : look the headtube :
On the 17", the horizontal tube is welded in the diagonal tube, and the horizontal tube is really horizontal.
On the 19", the horizontal tube is welded up the diagonal tube, and the frmae is sloping (like yours)
On the 21" : the headtube is very long, and the frame is really sloping.