Originally Posted by
confente
Shown in the 1963 combined Cinelli/Columbus catalog...
Columbus butted frame tubes for road races:
-No. 1 - Type "SP" butted 0.7/1.0 - weight kg. 2,375 per set - Strada Pesante (Road Heavy)
-No. 2 - Type "SL" butted 0.6/0.9 - weight kg. 2,065 per set - Strada Leggera (Road Light)
Columbus frame tubes for track races:
-No. 3 - Type "PS" for Sprint and 6-days-races - weight kg. 2,435 per set - Pista Spiccato (Track Strong)
-No. 4 - Type "PL" for pursuit or record-races - weight kg. 1,830 per set - Pista Leggera (Track Light)
Cinelli & C. S.r.l. was the sole sales representative worldwide for Columbus tubing starting in the early 1950s. ~ Chuck
Originally Posted by
avhed
The SL tubeset drop 140 grams to 1925 grams. My guess for the year of that was around ~1978?
The published weights of tube sets were a bit of smoke and mirrors... Here's why:
1974 Spec Sheet from
"DeLongs Guide To Bicycles And Bicycling". The weight for a set of Columbus SL tubes is listed as 2065 g... Note the wall thickness for both the seat stays and chain stays is 0.7mm.
Jump ahead to 1978. This Columbus Spec Sheet still lists SL at 2065 g and the seat stays and chain stays at 0.7mm wall thickness.
Here's where "Truth In Advertising" comes into play. This late 70's Italian Spec Sheet shows the main tubes in 3 different lengths 600mm, 620mm and 650mm, the seat stays in 3 different lengths 500mm, 550mm and 580mm and the weight is listed as 1925 g. The chain stays are still 0.7mm thick.
The longer tubes have to add weight to the set???
In 1980 Columbus increased the wall thickness of the chain stays from 0.7mm to 0.8mm because of cracking issues.. The weight was still listed at 1925 g. (the arrow pointing to 0.9mm is the fork wall thickness)
In addition to published weights being misleading, when tubes are cut to length the weights will vary depending on the frame size....
verktyg
