I have ridden my norton commandos (1972 and 1975) over 500 miles so far this year and will ride another 500 or so next week. I have done 600 on a 1959 r26 bmw, about 450 on a sl175 honda and about 400 on a 1963 Triumph tiger cub. My oldest bike is a 1931 but I regularly ride bikes back into the 1940s. I will confess however, that for distances I ride a r1250 gsa bmw.