Another tandem related question I'm afraid.
I want to modify a 145mm rear hub width tandem frame to take a standard 135mm hub.
The plan is to cut two 5mm thick shims to the same shape as the drop outs and get them welded to the inner faces.
I spoke to the guy from the motorbike shop where I will probably get this done today and he said it would be helpful to know what the alloy is so the welder would know what rods to use.
Manufacturers always state that their frames are made of 6061, 7075, or whatever, but nobody ever mentions the drop outs.
So, does anyone know what it is likely to be ?