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Old 01-15-22, 11:25 AM
  #18  
The Golden Boy 
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Join Date: Aug 2009
Location: Waukesha WI
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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 Road Fan View Post
Being a 61x the main tubes are double butted 531 and the seatstays chainstays, and fork blades are either straight 531 or straight CrMo of some other origin.
A 600 series frame should not have 531 stays and fork. CrMo or Tange Mn alloy.
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