Hi! I'm new to cylcling for about one year now. I just did my first 40 mile ride on my Specialized Sequoia. My left knee is now bothering me, and I did not have problems before. I'm, 64 years old and weight in at 255. Do you think it's just my age, or bike fit. I tried clipless pedals, but after a fall, I felt not safe in wearing them as I do a lot of riding on the road with cars. This was last year. I read that clipless may keep my feet in the right postion and avoid knee pain. Should I go back to them ? My next goal is a 70 mile ride.