what is the Main wheel diameter and the tail gear diameter on a Cessna 120.
there are options, some come with Landing Gear that has one of the following. Two main wheel-brake assemblies, 6.00-6, Type III: (a) Goodyear Model L6HBD Wheel Assembly No. 511413-M Brake assembly No. 9520292 (1) with 6.00-6 4 ply rating tires tubes . 34 lbs (2) with 7.00-6 4 ply rating tires tubes 36 lbs. (3) with 8.00-6 4 ply rating tires tubes 44 lbs. (b) Goodyear Model LF6HBD Wheel Assembly No. 511960-M Brake assembly No. 9520517 (1) with 6.00-6 4 ply rating tires tubes 31 lbs. (2) with 7.00-6 4 ply rating tires tubes 33 lbs. (3) with 8.00-6 4 ply rating tires tubes 41 lbs. (d) Goodyear Model CL6HBM (Castering) (Wheel Brake Assembly No. 9540234 and 5) Wheel Assembly No. 9530242 and 3 Brake assembly No. 9530368 and 9 Installed in accordance with Cessna Dwg. No. 0441150 (1)with 6.00-6 4 ply rating tires tubes 48 lbs. (2) with 7.00-6 4 ply rating tires tubes 50 lbs. (3) with 8.00-6 4 ply rating tires tubes 58 lbs. 202. Tail wheel and tire (a) Scott 3-24B (6.50 x 2.50)5 lbs. (b) Scott non-steerable, full swiveling 4 lbs. (c) Lang (formerly Decker) D-501 steerable (Pacific Coast Aircraft Dwg. A-550) 7 lbs. (d) Scott 3200, steerable, swiveling (e) Maule SFS-1-2-P8 7 lbs. (f) Goodyear Model 95-0843 8-inch wheel with pneumatic tire Tail wheel and tire, Maule SFS-1-2 6 lbs.
6 mains. Couldn't find the tail wheel.
Cherokee gave you all the info that you need. If you are the owner of a 120, google the Cessna 120 / 140 Association. These people are a wealth of info and help for those of us who own and fly these wonderful little planes.
