Assuming your scales are correct and the 1.982 is without the headset cups, that's 4.36lbs for the frame alone. You can usually reckon on around 50g per size variation, so normalising to size 18 as people usually do, you would say this Peugeot is a 4.25lb frame.
That means it is definitely a heat-treated frameset, and I guess all Nivacrom was heat-treated in fact. It's also almost exactly the same weight, normalised to 18, as my 1997 Kilauea made of Columbus Cyber Nivacrom. Obviously we don't know how the stays, head tubes etc compare, but all other things being equal it might have a similar tubing profile to the Kilauea. That was a 28.6 x 0.7-0.4-0.7 top tube and a 31.8 x 0.8-0.5-0.8 down tube and a 28.6-30.0 x 1.3-0.6-0.9 seat tube, with butted stays.
4.25lbs is close to a sensible minimum for a steel mtb frame weight. Some makers used to use road-gauge tubes to get down to 4lbs and below, but that doesn't necessarily make a better frame.
That means it is definitely a heat-treated frameset, and I guess all Nivacrom was heat-treated in fact. It's also almost exactly the same weight, normalised to 18, as my 1997 Kilauea made of Columbus Cyber Nivacrom. Obviously we don't know how the stays, head tubes etc compare, but all other things being equal it might have a similar tubing profile to the Kilauea. That was a 28.6 x 0.7-0.4-0.7 top tube and a 31.8 x 0.8-0.5-0.8 down tube and a 28.6-30.0 x 1.3-0.6-0.9 seat tube, with butted stays.
4.25lbs is close to a sensible minimum for a steel mtb frame weight. Some makers used to use road-gauge tubes to get down to 4lbs and below, but that doesn't necessarily make a better frame.
