My Bullets are shod with Dunlop 3.50 x 19 K70's front & rear. My area has the typical Sierra-foothill twisty country tree-lined lanes, so expect leaves, sand, gravel, smatched squirrels, etc. on the pavement at all times. K70's are open enough to deal with dirt-like conditions, and speeds are usually 25-45. These seem to work fine on the occasional sections of 55-60 two-lane as well. Without serious attention to brake and suspension improvement, and with only 22 BHP (maybe) on tap, the Dunlops work well for me. The mild power allows for the K70's to function satisfactorily on the dirt fire roads too. Being both 3.50 x 19's, one tube covers all as well.