I’ve run 26 x 1” to 2.15” tires - prefer 1.5 to 2.x
two of my current favs pictured above - Panaracer Pasela 1.75 and Maxxis DTH 2.15
1.75 Panaracer Pasela 1.75 - top picture
2.15 Maxxis DTH - bottom picture
also have set of Schwalbe Billy Bonkers 2.10 for another bike … Rene Herse Naches Pass (1.8) for another bike
That ATX with gumwalls ... looking good! Classic good looks. I will look at the Naches Pass I never think of Rene Herse ... maybe because I am a roadie