I have had this problem for 30 years, I have rebuilt the wheels twice and made sure the wheels are spot on with the centre line of the bike and in line with each other. But still the problem exist. any ideas or is this normal.
HI have look at the frame has the bike ever had a sidecar on it the frame can be twisted i had a matchless wen i took the chair off that would pull to the left i put it down to the frame a bit out of line because of having a chair on it
My late father covered a lot of miles on various bikes, but when following him he always appeared to be sitting to one side - I can't now remember which. Whether that was to counter a tendency of the machine I doubt.