I am gathering all I need to set up the ol' Kilo as full-time fixed. I want to have a cog on both sides of my hub, as I know many here that do distance events roll that way. I am currently running a 46T ring up front, which I plan to keep. I've been using a 18T cog which brings me to 68.3". This is about right right for me considering the terrain I commute on, plus my current fitness level. It can get a bit "spinny" if I have a tail wind on the flats, but that is super rare.

So, moving forward... if I were to gear down a bit for my other cog, how low is practical? I don't have the longest drop out in the world to be sliding the rear wheel all over the place, but even dropping to a 19T cog would cut me to 64.6". Is this a noticeable change? Should I go even lower to a 20T?

I would love to hear from those that run a double-fixed hub. Thanks.