The serial number is odd. It could possibly be one of the Yo Eddy Prototype bikes built in late '89
I would be shocked if this bike was an '85; the tubing diameter, geometry & all of the frame details look like a '90s FCC product not an '80s. I have the serial number book from '85 & there is a bike in there with this exact serial but there are no indications of a threaded bottom bracket or anything out of norm. This SN book also has a section in the back of frames sent back for repair & this bike is not listed. If the BB shell was later swapped out for a threaded one than someone would have had to re-stamp the serial?
What size is this frame in inches? Any idea what size seatpost fits in the seat tube? This will clear up a lot of the confusion
By the way I am specualting allot based upon what my gut is telling me but if I am way off than hey, I was way off. Thanks so much for sharing this unusual bike!
Who else has a gut feeling on what this bike is? By the way I don't think that anyone has any doubt that this is a Fat Chance of sorts.
The seatpost is 26.2MM