Proline's current truggy wheel is 4" diameter. But most of the aggressive bashing tires come in sizes for monster truck wheels (orignally, truggies ran these too) which are 3.2" or 3.8". So be sure that you get the proper wheel to go with them. The newest truggy wheels are too big, and in Proline's case, the way they mount up is different too.

Proline makes a bunch of different basher tires:

http://prolineracing.com/monster-truck-all-terrain

IMEX does as well:

http://www.imexrc.com/servlet/the-Ti...ggy/Categories