Claimed to be one of the most challenging cycling climbs in California, Onion Valley offers cyclists a tough, lenghty 21km climb to master. The 2804m ascent passes through dry and rocky terrain with stunning desert scenery in the background.

7 Things Cyclists Wish all Drivers Understood

The breathtaking view will really take you by surprise once you reach the top and is a great reward for all your hard work. There are no pit stops on the route and temperatures in the area can exceed to 100 degrees, so it can be an absolute killer to conquer in the summer time.