I have three gears in the front and 8 in the back, but I always use the highest gear (I live in a flat place) I might drop down one or two gears occationally but this is only a small fraction of the time.
I want to buy new gears and re-center this distribution around something I find useful, I probably only need the top three ratios from my current setup, and I would like to have maybe 5 more ratios above that. Is this type of modification ever performed?
Sorry I don't know any of the relevant cycling vocabulary. Also, what are power ratios measured in and how do I determine the ratio of my current highest gear?
Where should I buy these parts? Can I make this modification for under $100?