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@fixedrob
Vintage SAB road frame probably dating from the early 1990's. Hand made in italy from Columbus Thermachrom steel alloy tubing.
Seat tube (ctc) 54cm
Top tube (ctc) 55cm
Headtube (cm) 16.5
Bottom Bracket: ITALIAN
Headset: 1 inch
Seatpost diameter: 27.2mm
Frame & fork weight 2kg
Columbus steel – thermacrom alloy, ultrafoco, triple butted tubes, h.t.c high temperature conditioned
Here are some photos:
https://www.dropbox.com/sh/20yuxt2f460jzzz/U_YMajyv_H
As you can see the frame and forks are in great condition with only a few minor scuffs.
Columbus Theramcrom was a high end heat treated steel alloy tubeset that offered all the ride benefits of steel with the lightness of aluminium. It's still as good today, and will make a lightweight, great looking, totally unique all day tourer or stylish urban commuter.
Framebuilding.com say the following about Thermacrom:
"Thermacrom can be considered to be a development of the nivacrom alloy and the ultra-fine structures resulting from the secondary precipitation of stable carbides. The aim is always to improve the mechanical benefits of the frames, maintaining a high coefficient of safety with even small thicknesses. The final weight is very close to that of the best aluminium frames. Thermacrom is a steel microalloyed with manganese, chrome, molybdenum and vanadium.
These elements produce a marked increase in temperability, a reduction in sensitivity to overheating (which ensures that a fine grain metal structure will be obtained after welding, more able to withstand fatigue stresses), better characteristics of strength and tenacity and better characteristics of resistance to corrosion and wear.
After mechanical deformation, working and drawing, Thermacrom undergoes heating and cooling cycles that give the steel its particular microstructure. The treatment, which only ends at the time of welding by the frame maker, enhances the mechanical characteristics of the material by giving it high breaking loads (1250-1450N/mm2) permitting completely safe reductions in thicknesses. Thermacrom is used for very top of the range frames that require the highest benefits."