Originally Posted by
Road Fan
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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Commence to jigglin’ huh?!?!
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