Lately my rydes have been 20 to 50 miles with temperatures of mid to upper 60's. I set my pressures at a tad under 20 PSI for front and under 28 PSI for rear tire. Yes, unfortunately I have Kenda tires.

I will be taking several 300 plus mile rydes with temperatures of low 50* F. Should I set the pressures at 18 and 26 PSI or even lower prior to the start of the ryde?