Fat Tires and Front Derailleurs, Ad nauseam.     Earlier last year I was experimenting with wide rims + big tires on my Karate Monkey and had the joy of dealing with tire rub on my front derailleur cage. I was using an early proto of what led to the Rabbit Hole rim and a Maxxis Ardent 2.4” tire. Thankfully we make [and supply with our frames] a nice little fitting, the “Monkey Nut V2” [MNV2].     Several Surly frames, starting with the Karate Monkey, have come equipped with our horizontal dropout with a derailleur hanger. This little frame bit is…