If the frame is cracked or is showing fatigue. Other than that replaces cables and bearing, repack lube, etc. Unless you want a newer style of bike/frame.
I think my grandfather had the same commuter bike for 50-60 years
I used to do track racing years ago. You always knew who was about to buy a new track frame by the loud cracking noise their bottom bracket shell made as it broke away from the seat tube when they started a kilo (1000m time trial). It was always some sprinter with enormous quadriceps muscles.
If the frame is cracked or is showing fatigue. Other than that replaces cables and bearing, repack lube, etc. Unless you want a newer style of bike/frame.
I think my grandfather had the same commuter bike for 50-60 years
I used to do track racing years ago. You always knew who was about to buy a new track frame by the loud cracking noise their bottom bracket shell made as it broke away from the seat tube when they started a kilo (1000m time trial). It was always some sprinter with enormous quadriceps muscles.