Single speed bicycle vs. multi-speed bicycle?

great_guns2003

New member
I use my father's 29 year old single-speed BSA deluxe bicycle. I've kept it in good shape and I have done a 100KM trip spread over one evening and the next morning. I have been thinking of getting an 18-gear system installed on it.

I would like to know what real advantages I can get by installing such a system. Also, though some of the advantages are obvious, are there also any disadvantages of a multi-speed bike compared to a single-speed bike that you are aware of?

If I do continue with the single-speed configuration, what are the ways in which I can maximise the efficiency of my bike?
 
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