I have a 1986 SR400 and an ‘88 Criterium.

If yours is a touring model (ST) it has a slightly shallower head tube angle, longer wheelbase, cantilever brakes, and a triple crankset.

Here is my readers digest history…

Originally made in USA, sued by Klein in the 80’s, Cannondale won 90% of lawsuit due to 70’s college class with oversize tubing. Lost the oval seat stays so they went to their cantilever dropouts. Had notorious issues with the design. Klein bought by Trek and had no interest in dropout lawsuit and Cannondale returned to vertical dropouts. Changed the railroad head badge to the current wrench “C”. Introduced Coda parts line. The owner, and therefore the company, got heavily involved in motorcycle racing and that put them into bankruptcy. They got bounced around to different parent companies. All frames are now imported, but they are a viable bike option.

John

Edit added: In the late 90’s/2000’s Cannondale came out with one of the most bizarre products… the Lefty fork. While it is suppose to work quite well, I could never get my head around only one fork leg.