Originally Posted by
Hobbiano
In the specs (above), where it says the fork is 531cs, it's not necessarily untrue, because it's part of the 531cs tube set, but it's chrome molly, likely 501 tubing, because that's what the 531cs tube set consisted of, so it's kind of misleading.
On my above-mentioned '85 600, the seat tube decal says 531CS, and the fork blade decal says 531.
And while we're flashing 412s of that era, here's my odd duck, Ruby:
She's an '82 412 only by the serial number, and I suppose the overall geo. But a number of "deviations". RD cable stop is under (well, under and "out", like a 4 o'clock position) the chainstay, and the mech cables go under the BB, which is marked "60TSI" (per vintage-trek, 60 degrees btw. seat tube and downtube, design by Tim Isaac). Full 022 including stays and fork, and it's definitely an investment cast fork crown. Rack braze-ons on the seat stays. '82-'83-style panel, but the T R E K are each separate stickers on the panel. And I don't think this colorway was offered on the '82 412.