September 14, 2015 9:16 AM PDT
I've gotten over 100k on belts before. I have a 93 Softtail with over 60k on the original belt. If you check the manual you'll see there is no lifespan listed. Just keep checking the tension and inspecting for damage. If you do have to change it, though, I recommend OEM. I've put2 aftermarket belts on that didn't last for shit.