The famed Speed Twin was renown as a speed wobbler, especially in pre ’55 bikes which had the nasty sprung hub back end. Poor braking didn’t help. Engine shakes things off if used to the full but not entirely lacking in reliability if rebuilt using modern parts. A lot of restored stuff that’s hardly ever used on the road, plus a smattering of neatly modded bikes, but even these don’t come cheap.
1946-58 499cc (63x80mm) OHV twin 28hp, 85mph, 60mpg, 375lbs