Originally Posted by
T-Mar
The welds are too small and the material in the clamp too thin to be aluminum. Try a magnet. Titanium is virtually non-magnetic. There may some very weak reaction due to trace iron. If you get a strong attraction, it's steel with a titanium finish.
I grabbed a magnet and checked. It is magnetic. Stronger on the down tube than on the top tube.
And it has writing on tube:
NITTO JAPAN
HEAT TREATED
0.Z
26.0
So some type of heat treated steel?