Last weekend I picked up a couple of sets of tires. I had some time today to get a set onto the model 40. Bottom tire in the first photo is the old set. Top tire is the new set.
While it was out, I put a Wisconsin AB on it to make sure the tires would clear. They do, but just. It is the wrong engine but I don't have a spare ABN that is complete.
I also thought I might get some comparison photos of the 15 beside the 40. The 40 is a monster compared to the 15.