I'm putting together my first SS/Fixed using an old Miele Roadie. I'm looking at starting with 70 gear inches. This can be achieved many ways with different chainring and cog combinations: ex. 48/18 42/16

Is there and reason, good or bad, to chose one set of gears over another. The only reason I see using a smaller front chainring combo is when moving up or down rear cog, it isn't as big of a jump as using a larger front chainring.

Any thoughts? Surrounding countryside is flat and I won't be using bike as an urban commuter.

Canflyboy

'06 Brodie Quantum hybrid
'07 Brodie Romulus cyclocross/commuter
'08 LeMond Tourmalet Roadke
?? Miele Project