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@BringMeMyFix
Apart from stuff that's been mentioned already...
Why such a HUGE difference between ratios? 42/23 is too low. You can get major acceleration from a standing start closer to 60".
Surely having ratios with matching teeth counts will put you in the right ballpark for starters:
48 -> 42 = -6
15 -> 23 = +8 ... so using a 21 would match.
However, **where are you going to find a freewheel with more than 18t?
**A 42/18 would give you a snappy gear on which to accelerate, and a smoother transition to your 'track' gear.
eg:
42 -> 46 = +4
18 -> 14 = -4
Giving you approx 61"/87", with same number of chain links each side.