I'm not going to provide specific tire recommendations, but I ride "gravel" 
and single-track quiet a bit on my Roadini. I still remember that time in 
the 1990s when I was riding with Bridgestone-sponsored cyclist Eric House, 
and we all showed up in the East Bay proud of ourselves for riding road 
bikes on a Grant ride. Grant showed up on a fixie with 35mm tires and 
proceeded to outride us all on and off road. 

A few principles:

   - The lighter the rider, the smaller the tire you can get away with. At 
   140 pounds, I can ride fire roads with 25mm tires (or even 23, back when 
   Michelin 23s were $10/pop!)
   - Tread or no tread doesn't matter as much as rider skill and speed.
   - Rider skill cannot be disentangled from bike fit. If the bike doesn't 
   fit, you will find stuff scary that you can actually ride if the bike fit. 
   I once accidentally raised my seat too high and discovered that stuff I 
   could easily ride suddenly became hard!
   - The longer the ride and the steeper the climb, the more important 
   weight becomes. I can ride big heavy tires if I'm only going to go downhill 
   because a car did most of the work. But if I have to do a lot of climbing 
   (some of which turns into hiking inevitably if you ride in mountainous 
   areas), the lighter the bike the better off you are.
   - You can drop tire pressure far more than most tire pressure 
   calculators will tell you to. I can run 700x40 tires measuring 38mm at 
   25psi (the Rene Herse calculator will recommend 33psi) when I'm riding off 
   pavement. On the pavement that same pressure will feel inefficient. I go so 
   far as to carry a pressure gauge to drop tire pressure at the trail head 
   and pump up the tires when I transition off a dirt descent onto pavement 
   for the ride home.
   - Bigger tires affect handling - one reason I don't ride with as big a 
   tire as I can get away with is that you lose some agility. Frequently I 
   find that being able to steer precisely and quickly offsets the inability 
   to plow through some obstacle head on.

What I do notice is that most people don't like to underbike. They will 
make comments that I won't be able to do a ride on my 25mm tires and then 
be all surprised when I show up and do the ride. But when I'm touring I'm 
not going to bring 3 different bikes, so I just push the limits and go 
slower and occasionally depend on pulling a spare tire out of my saddle bag 
if a tire were to shred during a tour (which can happen even if you're not 
riding off pavement).

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