are the proline caliber 2.0 tires wider on the inside or outside? or a bit of both?
Both, great tires! I run the m4 calibers on my 2x4 FTSC10 on indoor clay and they work really well. They work really good on outdoor loose dirt also. With the 4x4 you better get the under tray because these sling the dirt big time! Id probably go m3 for outdoor, the m4's are almost to soft!