Pick some up from Hempel. He sells them for his Cubs. His 12" will be way to heavy for the WM 1/3 Cub. I use 8" CB Associates wheels on my WM Cub. The 12" Hempel wheels are very nice aluminum and will require 3/8" axles. I run those on my 40% Cub. Way too big and heavy for the 1/3 in my opinion. Jerry.