While road riding: gravel, bungee cords (go figure), detritus from logging trucks, hills, mountains, the sweat in my eyes, lakes, more hills, people who ride without helmets, discarded beer cans (lovely. Just lovely)

While mountain biking: roots, rocks, narrow bridges & planks that call my name (sometimes I listen, sometimes I don't), bears (black), kamikaze voles, mountains, singletrack, sweat in my eyes, uphills, downhills, my companions, other riders, wasp nests