Benandemu came up with this coding system for frame numbers. There are a few problems with models that are close in the range, but it's not a bad starter:
" I have more answers...
Take my frame number
The M is the factory.
M is Marvel, F is Fairly and T is Ti sports
7 is the model number. Exclude the Ti bikes and work down the list eg.
1 Team Issue
2 Team Marin
3 Pine Mountain
4 Eldridge grade
5 Bear Valley
7 Palisades Trail
8 Bobcat Trail
4 is the year ending number. That would be 1994.
HA is month and date, but you will need the Enigma machine to decode these. Not really relevant either!
B is the size centre to centre.
A is 14 inches
B is 15.5 inches ( this makes it 17 centre to top)
C is 17 inches
D is 19 inches
E is 20 inches
182 are production numbers that are factory use only, and again require the Enigma machine.
So, from that you can calculate the year, model and place it was made.
Seems I have a 94 Palisades Trail frame and forks. The frames were all the same up to Eldridge and then they used Tange prestige or Superlight tubing."[/color]
Also look through the Marin catalogues in the Gallery & Archive section.
You can also look at the shimano parts list on this website if you know some of your shimano stuff is original bike kit: http://www.fa-technik.adfc.de/Herstelle ... pen90.html
Helped me date my Eldridge Grade.