Here’s my take. I did a quick look at your hybrid city bike. The basic geometry is not that far off from a 10-12 year old 29er, except the chainstays are probably too long. I’m not saying it is comparable to a mtb, just looking at angles, wheelbase.
Since it is a flat bar bike and you sound like it will be a less technical replacement to your 26er, I’d approach it that way. Little more aggressive rear tire and a more rounded better rolling front tire.
You will probably be in the 400-500 gram weight for a folding tire. Obviously the more traction the slower rolling and the more grip the less durable… generally.
Also, the days of $20 folding tires are over. Even old 26” Fire XC Pros are running close to $50.
John
Edit added: You won’t have a problem with 22mm inside width rims. People were running over 2” on Mavic 217’s.
If you go to 42mm make sure you have frame clearance.
Last edited by 70sSanO; 09-20-22 at 08:24 PM.