Single speed forum maybe?

I’ve built up a bike like that. 32mm Conti 4-seasons or Gatorskins are best for that. Road calipers typically won’t spread that wide though, and the brakes rubbing against an inflated Gatorskin (on removal) tears up their “reinforced” sidewalls pretty bad.

Not really off road geometry, but you can do some light duty hardpack stuff. Good geometry for urban bashing where you want your bike to have good reflexes.

You could consider using some flared drops if you want drops. For that build, I think I would stick with traditional flare though. Tat and least a seat post fender for those wet muddy rides.

Wide rims (19mm+ internal) that are tubeless compatible would be good.