Which is better for flat, sometimes windy conditions-
Having a one tooth difference between cogs, or having a two-tooth difference between cogs?
Right now I have one bike with a 40t ring and 15 and 17t cogs. My other bike has a 42t ring with 16 and 18t cogs. If there's no wind, I like to run about 70", which would be the smaller cog on both bikes.