This was supposed to be a Zone 2 HR ride and it was for the first 1/3rd of the ride. I looked down and I was at Zone 3.8, I was riding in to a strong head wind 15-17 mph with gust in the mid to upper 20's from the start. My average was 16 mph so I decided to keep it in zone 3 to pick up the pace some. I made a turn and had a side wind so I decided to make the best of it in an attempt to get may average speed up, now I was in Zone 4. Not feeling bad and starting to feel some of my old self coming back! My back started to hurt but I stuck with it doing a lot of standing on hills and into a strong head winds to ease some of the pressures off my back. I was not able to ride my 21,19 or 17 gears as they are over stretched. So that left me with 23, 16, 15, & 14. Was not able to shift into 13 &12. The ride was good and I felt good about it.