I suppose with mnt bike gearing you can sit and spin all the way up. I specifically outfitted my bike with 50/34, 11-30 so I can ride up Las Flores and it's sister canyon Tuna without it becoming a mockery. Both have a middle section of a mile or more of 20%ish, with Tuna having the longer section of brutality. First time up Las Flores was very successful. I felt really good that day. 2nd time some 2 months later, I had to stop or drop dead, then could only continue on foot for a half mile. I still don't know why.