What @froze said,
Old bikes are fine. If you are gonna race or train with a competitve group you need what everybody else uses, so that means at least 10s or 11s. IF you ride mostly alone, 6 s or 7s is plenty as long as you have at least one gear low enough for the steepest hill you ride, and they are more reliable and easier to maintain as well.
FWIW I ride an 11s with my club group, but when I ride alone it's usually a frankenstien Trek from 1985 (?) that I converted to a single speed.
em
Old bikes are fine. If you are gonna race or train with a competitve group you need what everybody else uses, so that means at least 10s or 11s. IF you ride mostly alone, 6 s or 7s is plenty as long as you have at least one gear low enough for the steepest hill you ride, and they are more reliable and easier to maintain as well.
FWIW I ride an 11s with my club group, but when I ride alone it's usually a frankenstien Trek from 1985 (?) that I converted to a single speed.
em