I also ride a "light" steel bike which comes in over 20 pounds and under 25.
Unless you throw away your waterbottles and cut off your hair, i'm not sure the 5 less pounds a lighter frame buys you is going to help THAT much. What helps is strengthening your legs.
I had a frame made for me (vertically challenged), and while I was waiting I bought parts - some on sale, some from a swap meet, and some for full price.
Then i had a pro assemble it.



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