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85 Trek 620

Old 03-28-17, 01:04 PM
  #26  
The Golden Boy 
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Bikes: 1978 Trek TX700; 1978/79 Trek 736; 1984 Specialized Stumpjumper Sport; 1984 Schwinn Voyageur SP; 1985 Trek 620; 1985 Trek 720; 1986 Trek 400 Elance; 1987 Schwinn High Sierra; 1990 Miyata 1000LT

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Originally Posted by stardognine View Post
If you look around closely, on the serial number pages, there's a link to the production totals, for each model & each year. It's a spreadsheet thingie, that someone made up from Trek's data, in their journal. I think I said that right, but when you find it, you'll see that I'm at least mostly right. 😉 BTW, I looked around there again yesterday, and there was an '86 Trek 520 Cirrus, with fairly long chainstays, but no 620 Cirrus. Don't sweat it, I'm sure it was an honest mistake. I know I've had to read through that site several times, it's fairly confusing. 🤔
And hey, read that '86 brochure again, especially the introduction paragraphs, for each category (racing, touring, etc.) . It clearly states that all the steel frames assembled with the new robots, were brazed with silver rods. Obviously, not the aluminum & carbon frames, lol, but the steel ones, which were obviously made in much smaller numbers. 🙂
It's no mistake.

The leftover 1985 model year Trek 620s were sold as "620 Cirrus" models that weren't in catalogs. The 520 cirrus in 1986 had sidepulls and sub 43cm Chainstays. Do a quick search for "Trek 620 Cirrus" and you'll see what's clearly 85 model year 620s with a silver head tube similar to the 1986 paint scheme. You'll often see them as 1985 models because they're made and serialed in 85. The 1987 Trek 520 was back to touring form with cantis and 45.5cm chainstays.


Keep in mind, a model year's bike is also manufactured towards the end of the preceding year. On November 20, 1984 799 Trek 620s were serialized.
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Old 03-28-17, 03:16 PM
  #27  
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Yep, I was mistaken yet again, lol. 😞 I didn't search for the 620 Cirrus again yet, but you're absolutely right about lots more frames being built in '84, for the '85 model year. All the clues are there, but it still gets tricky, for dummies like me. 😉 So, maybe I can upgrade model years after all. 🙃 😁
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Old 03-28-17, 04:31 PM
  #28  
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Bikes: 1978 Trek TX700; 1978/79 Trek 736; 1984 Specialized Stumpjumper Sport; 1984 Schwinn Voyageur SP; 1985 Trek 620; 1985 Trek 720; 1986 Trek 400 Elance; 1987 Schwinn High Sierra; 1990 Miyata 1000LT

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Originally Posted by stardognine View Post
Yep, I was mistaken yet again, lol. �� I didn't search for the 620 Cirrus again yet, but you're absolutely right about lots more frames being built in '84, for the '85 model year. All the clues are there, but it still gets tricky, for dummies like me. �� So, maybe I can upgrade model years after all. �� ��
I'm going to tell you a secret... I was actually considering something close to that... My 620 is in FAR too nice of shape to do it- but IMO- the 1986 400 Elance is one of the nicest looking bikes ever. That blue (it's lighter than the 620 blue) with the silver head tube and silver lug windows- and IMO the 1986/87 Trek decals are the best looking combination of all time.

620:



400 Elance

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Old 07-11-21, 06:26 PM
  #29  
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Fantastic build on that 620

[QUOTE=The Golden Boy;19474472]I'm going to tell you a secret...)
I absolutely love the look
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Old 07-13-21, 05:35 PM
  #30  
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Originally Posted by The Golden Boy View Post
I think you're making a much much bigger deal out of it than it is.

First, the wheel size is independent of the distance between dropouts.

Second- the 80s Treks are spaced at 128 so they can go to 126 or 130 with no mechanical spreading other than your fingers and minimal (I mean minimal) effort.

Third- think of all the 120 to 126 and 126 to 130 conversions you've seen here (and the millions more throughout the world in the past 30+ years)- and think of how many mentions you've read of a chainstay failing from spreading a rear end from 128 to 130.

You're tying your shoes together by not considering a different wheel set. If you're OK with the Helicomatic- take care of it- there's (a few) people that still have them running. I guess it's just suggested to maintain them a little more often.

Again- there's no real problem in staying with 27" wheels- the bike was designed for them- and there's still quality tires around. I've used both the Pasela 1 1/4" and Sand Canyon 1 3/8" tires. I just took the 720 to a 10 speed 130 rear end and 700c wheels. And I'm SO glad I did.

If you're curious about it- try it- you can always go back Just don't spread the thing to 135.

Good Luck!!!
happened to see this thread after all these years come up. in the end, i just leave the bike as it and just maintain it. having a variety of bikes makes it worthwhile to leave things as they are and just appreciate them. if i want to ride with more speeds, there are others in the stable to do that with.

again, thanks for the advice.
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