In a message dated 12/2/00 8:14:56 PM Pacific Standard Time, CYCLETRUCK@aol.com writes:
<< Sender: classicrendezvous-admin@bikelist.org To: classicrendezvous@bikelist.org
Today I saw a mid-80's Trek with a very peculiar post clamp lug. The seat stays appear to be butt-welded--fast-back style--to the lug .........and then there are a pair of 1/2" long, additional lugs(or maybe just collars) 1&1/2" down the stays. Each of these collars have the TREK name cast into it. As do all the other lugs and the BB. This BB is the same as on my '85 720 & 770---- but all the lugs are different. Dazzling silver metal-flake paint job. With red decals:"500 series", "TREK", & "USA". No tubing clues. All Shimano 600. 22"or 23" frame. It will be for sale but the owners are not in a hurry.
Anyone know anything about those strange lugs?
Calvert Guthrie Kansas City >> It was some sort of cast seat cluster that made finishing easier and made robotic brazing easier. Another peculiarity with many of the 500 series frames were the 'faux-lug head tube clusters
It was a head tube 'casting' that had the upper and lower lug integrated
These could be identified by a differential in lug-line depth from the edges of the 'lugs' that met the head tube (shallow and fake) and the edges that met the down- and seat tubes (twice as deep)
Many were 501 tubung , some Ishiwata or a clone
My favorite Trek frames are the ones I have from the 70's and very early 80'3 that were fully lugged, had Campy dropouts, Columbus SL, Reynolds 753, and Fully DB 531
Larry Black