The "Trek In A Box" Bottom Bracket
 

When did Trek start using the bottom bracket with the Trek in a rectangle logo?

http://www.vintage-trek.com/images/t...0%20BB_268.jpg

i think it may have been when they came out with their investment cast lugs in the mid 80's. i could be wrong on this.

there are people here who are more informed, or at least more confident than me about this :lol:. i'm sure you will get a more replies.

I have seen 85's with this, I know my '83 600 does not use it, and IIRC my '84 model 760 (built Oct '83) did not have this, either. I'm not 100% sure on the 760, and it's sold. It's possible that Trek introduced this on different models over several years though.

the 84 520 i worked on didn't have it, neither does any of my 90's mountain bikes

I'm pretty sure my '83 760 had it. My current 84-ish 770 or 660 (not sure what it is) definitely has it. I don't recall the serial number off-hand, but will check and confirm if you need it. (Another reason for my generic serial number database idea. It can help answer the "when did manufacturer X do Y?" questions.)

S

I have it on my 1985 620- but it wasn't on my 1984 420- but the 420 was made in Japan.

i've seen that on an 85 520.

none of my 84's have it I dont have anything newer in steel

No real need, more like curiosity... I was trying to think if my 79 736 had that logo on the head tube lug- and I think it does, but it for sure does not have it on the bottom bracket.

Here it is on an '85 620 (also trying to see whether Dropbox photo sharing links work)
https://www.dropbox.com/s/4127tbwdfd...2011.51.07.jpg

That was around 1983 when we started using lugs and BB shells designed in-house by Tim Isaac and cast by Signicast in Milwaukee instead of 3rd party components.

Thanks much John, you're an invaluable source of information!