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'85 Trek 600 531CS?

Old 05-25-10, 04:04 PM
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David Newton
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'85 Trek 600 531CS?

Looking at a local bike, what is 531CS tubing?
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Old 05-25-10, 04:28 PM
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All Reynolds 531. Double-butted 531 main triangle, straight gauge 531 stays and fork blades. The CS stands for Custom Sport. Heavier than 531c
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Old 05-25-10, 04:34 PM
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gimme!
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Old 05-25-10, 06:28 PM
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Thanks E.
It is a 19" bike, slightly small for me, all original and in good condition for $150. I could use the parts on a bike I'm building, and ebay the frame alone, or build it as a upright single speed. I'll look at it tomorrow and see how it fits.

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Old 05-25-10, 07:54 PM
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darn, too small for what i was looking at or i'd get the frame from you
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Old 05-25-10, 08:32 PM
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Originally Posted by EjustE View Post
All Reynolds 531. Double-butted 531 main triangle, straight gauge 531 stays and fork blades. The CS stands for Custom Sport. Heavier than 531c
Sorry, not quite right. cs = club sport, a tubing set originally specified by Trek for the 6xx series starting in (edit)1984, consisting of 531c main tubes, and chromoly (not mangy moly like 531) fork blades and stays (assumed & probably 501 tubing).

Think of 531cs as a tubeset, not as a tube designation.

(Edit) My '83 600 has 531c main tubes and Tange Mangalloy fork & stays
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Old 05-25-10, 08:50 PM
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Originally Posted by Ex Pres View Post
Sorry, not quite right. cs = club sport, a tubing set originally specified by Trek for the 6xx series starting in 1983, consisting of 531c main tubes, and chromoly (not mangy moly like 531) fork blades and stays (assumed & probably 501 tubing).

Think of 531cs as a tubeset, not as a tube designation.

It rides fine. I have an '83 600.
1983 6XX has 531c main tubes and manganese alloy for stays and fork not chromoly. It can't be 501 because it is not a manganese alloy. Trek didn't start building with 531CS until 1984.
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Old 05-25-10, 08:51 PM
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Originally Posted by Ex Pres View Post
Sorry, not quite right. cs = club sport, a tubing set originally specified by Trek for the 6xx series starting in 1983, consisting of 531c main tubes, and chromoly (not mangy moly like 531) fork blades and stays (assumed & probably 501 tubing).

Think of 531cs as a tubeset, not as a tube designation.

It rides fine. I have an '83 600.
This is interesting, because I just double-checked the '85 catalog. The stays and fork are clearly stated as '531cs'. I would think that if they were chromoly, they would say so, like they did with the 510 example just above the 600...

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Old 05-25-10, 09:33 PM
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E

I think 531CS = 531C main tubes + 501 stays and fork. Probably for marketing reason Trek labeled the tubeset as 531CS.
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Old 05-25-10, 09:35 PM
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Please read decal #30
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Old 05-25-10, 09:40 PM
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I have an '85 Trek 600...it's my favorite ride in my little collection...for what it's worth, the Reynolds decal states:

Guaranteed Built With
Reynolds
531 CS
Butted Frame Tubes
Reynolds Tubes, Forks and Stays

I'd imagine it's some sort of combination of Reynolds tubing...I neither know nor care when I'm on a ride with it...it's a great bike...
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Old 05-25-10, 09:56 PM
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I own an 83 or 84 (I forget) Trek 610 w/ 531CS and love it. Ride it and forget about the tubing
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Old 05-25-10, 11:45 PM
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well then the 531cs 760 i just sold had 531 fork blades and speced full frame as well, so I believe it was 531 fullframe and fork blades. Stays may have been straight guage, not butted like the other 531
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Old 05-26-10, 08:57 AM
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Originally Posted by thenomad View Post
well then the 531cs 760 i just sold had 531 fork blades and speced full frame as well, so I believe it was 531 fullframe and fork blades. Stays may have been straight guage, not butted like the other 531
760/770s are spec'd with 531c (sometimes 531p), not 531cs, so yes, they are 531 throughout.

That's a "c" decal that you can't see the edge of, not a "cs"
(531c = 531 competition, 531p = 531 professional)
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Old 05-26-10, 08:59 AM
  #15  
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Originally Posted by EjustE View Post
All Reynolds 531. Double-butted 531 main triangle, straight gauge 531 stays and fork blades. The CS stands for Custom Sport. Heavier than 531c
Yes, but it still makes a nice ride!

I think it's important to have a LEGIBLE version of the description of Decal #30 from the Attachment:

"REYNOLDS 531 CLUB SPORT transfer; a cycle
bearing this transfer has top seat and down tube
BUTTED (as?) REYNOLDS 531 and head tube BUTTED
steerer, TAPER GAUGE forks, seatstays and
chainstays, manufactured from specially cold worked
chrome Molybdenum tubing. Designed for fast
sports and touring."

That's the best description of 531CS I've seen so far, defining its makeup. Trying to clarify, here's my translation:

Top, Seat, and Down tubes: 531 Butted (8/5/8, 1/5/1, and 8/5 respectively)
Steerer: Butted cold-worked chrome moly (meeting the 4130 specs)
Forks: Taper gauge cold-worked chrome moly/4130
Headtube, seatstays, and chainstays: Cold-worked chrome moly/4130

Recall that the 4130 AISI standard essentially defines the bounds on composition and performance of chrome moly steel, but it is my assumption that all chrome moly is 4130.

Last edited by Road Fan; 05-26-10 at 09:29 AM.
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Old 05-26-10, 09:22 AM
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Ex Pres is right. Here's a larger version of the decal chart, and more Reynolds info:

http://www.fivenineclimber.com/bikes...eynolds_80.htm

This Trek CS question comes up with amazing regularity.
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Old 05-26-10, 09:24 AM
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It was a very nice ride, but 2cm too large and I'm really liking the daily versatility of my 'cross bike.
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Old 05-26-10, 09:40 AM
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Originally Posted by jan nikolajsen View Post
Ex Pres is right. Here's a larger version of the decal chart, and more Reynolds info:

http://www.fivenineclimber.com/bikes...eynolds_80.htm

This Trek CS question comes up with amazing regularity.
Yes, it does! It's good to see that teh Gazelle chart agrees with the Reyolds chart, even though it's less detailed.

Reynolds 531CS is clearly DB 531 main tubes, with all other parts 501 chrome moly. The forks are "taper gauge" and the steerer is butted.
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