If you notice they recommend 42, for solo and dual riders. If you do mostly freeway riding then 40-42 is probably best. I prefer twisties and at 34-36 the tire is more flexible and warms up quicker, you also get a bigger contact patch. At the track (road course) I run 31 front and 30 rear....and when I come into the pits they are at about 36. Whatever type of riding that you do check your air pressure every day and keep an eye on how your tires are wearing and adjust the pressure accordingly.