New to this forum and thought I would toss in my 2 cents worth.
I have 2 Cirrus frames and one Experience Frame and wanted to know that year they where. I emailed RC the serial # and a fellow named Peter got back to me . He said that the third digit in the serial number is the year of manufacture .
So YA0 is 1990
YA1 is 1991
YA2 is 1992
Hello and a warm welcome to Retrobike.
For a first post you've really thrown the cat amongst the pigeon. Nothing like a good old debate about dating frames from serial numbers.
If my Cirrus is a 1990 that would explain the 27.0 seat post. However, there are notable similarities with the ‘91 frame not seen on the '90 frame.
As Fluffychicken explains, things were subject to change and materials used up at the crossover point.
Hopefully have some updates on Sunday once I've finished polishing a few bits and unwrapped some NOS goodness!