Rider in action – mountain bike Photography by Dimitar Hristov - 54ka absorption acceleration action adrenalin adventure aluminum athlete bicycle bicycling bike bikepark biker biking blur brake competition competitive competitor course cycle cyclist danger descend disc downhill excitement exercise extreme fast fitted flight fly forest fork frame fun haven Helmet hitech humans injury jump leap lifestyle male man men momentum montainbike motion mountain Mountainbike moving Nature outdoor pan protection Race racer racing recreation Ride rises risk road run shock speed sport sportsman springs strut summer suspension technology tire trail treads tree velocity zoom