1971 Crescent Stainless Steel Mark XX
06-27-12, 01:38 PM
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Actually, the idea of a stainless Crescent came from the US distributor. Swedish steel were a quality bench mark so the tubing were un-reduced. Tubes were welded together and the nervex lugs were applied afterwards (as two pieces). Manier bikes went straight to the scrapyard. Lugs were painted in black or gold and the mk IX would carry Sugino´s and Sun Tour. The mk XX was fitted with campy. We see them now and then on swedish CL. It has the time-proven overlap wheel and foot in three o´clock position...
Chombi
06-27-12, 01:48 PM
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I 'll look at the lugs to see if I can find a seam. From what I have read and been told, that seems to be the way that they did it.
So, if I understand correctly, the frame tubes were welded together and the lugs were split and applied over the tube junctions? That could actully be very much stronger than just brazing the tubes into the lugs as even the split lugs must give a bit of reinforcement at the junctions if they are brazed on the welded tubes.
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Chombi
06-28-12, 12:39 AM
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Correct - thats the reason why many frames didnt make it I´m told. The construction had to be 100 % true in order to apply the lugs. And the un-reduced Sandviken-steel couldnt be bent that easily...
07-12-12, 04:47 PM
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In todays CL in Sweden.
07-12-12, 05:15 PM
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Wonder what grade of stainless they used - I'm guessing from the vintage and the evident corrosion resistance that it was an austenitic (300 series) steel. In the absence of an XRay fluoresence spectrometer, can someone who owns one of these try a magnet on the tubing?
03-11-19, 11:36 PM
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Wonder what grade of stainless they used - I'm guessing from the vintage and the evident corrosion resistance that it was an austenitic (300 series) steel. In the absence of an XRay fluoresence spectrometer, can someone who owns one of these try a magnet on the tubing?
03-12-19, 05:52 AM
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Any more pics of the bike?
Are you sure this is a stainless frame? The lugs look to have been chromed, which would not have been done to these bikes.
Looks like someone removed the chrome from the lugs, which are carbon steel, resulting in the rust seen.
The frame tubes being magnetic would also point to the frame being made from a non-stainless steel alloy. Although the ferritic class of stainless steel alloys is magnetic, which could explain the magnetism if the frame is indeed stainless. The common 304 austenitic alloy we see today in most industrial applications, and the heat-treated martensitic stainless as we see in the modern stainless tubesets (Reynolds 953, Columbus XCR, KVA MS3), are not magnetic.
Are you sure this is a stainless frame? The lugs look to have been chromed, which would not have been done to these bikes.
Looks like someone removed the chrome from the lugs, which are carbon steel, resulting in the rust seen.
The frame tubes being magnetic would also point to the frame being made from a non-stainless steel alloy. Although the ferritic class of stainless steel alloys is magnetic, which could explain the magnetism if the frame is indeed stainless. The common 304 austenitic alloy we see today in most industrial applications, and the heat-treated martensitic stainless as we see in the modern stainless tubesets (Reynolds 953, Columbus XCR, KVA MS3), are not magnetic.
Last edited by TenGrainBread; 03-12-19 at 06:49 AM.
03-12-19, 07:18 AM
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magnet sticks to all frame tubes and forks. The lugs on these were painted, some black, some a sort of bronze color. It isn't rust on the lugs. I'm not even positive that this is a crescent, but all indications are that it is.
03-12-19, 02:24 PM
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-Mark
Last edited by bulgie; 03-12-19 at 02:25 PM. Reason: typo
03-17-19, 08:19 PM
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thanks to this forum, my 'crescent' has been identified as a 1973 Schwinn Paramount. someone painted the lugs and apparently lost track long ago of what the bike actually was and created a new identity for it.
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