Originally Posted by
CliftonGK1
I had 38/18 in that pic. Relatively flat course, dry day, not much pavement section.
For mud/hills, or less straightaways and more technical corners I'd swap that 18 out for a 20 in back.
On my commuter/mid-distance bike I have a 44/17 combo.
Interesting, it never occurred to me to do cross on my singlespeed. I run a 42/16 for normal purposes, and most of the time I use it fixed. Great training tool, IMO.