Left portion. I've found that riding center or right then cars tend to assume that i don't need the unused portion of the lane. Especially freeway. Back roads I'll ride like center left. Right side typically but not always has more loose gravel and debris.
07 vstar 650 midnight custom
Ais disable, 4.5 inch risers, V&H cruzers, jetted with pods, viking saddlebags, Kuryakyn mini boards and memphis fats windshield, fuel solenoids deleted, star solo seat and 4 inch extensions. Boss audio sound system.