The standard kenda tires seem to do ok at lower PSI if you do a lot hard packed or single tracked trails with sandy, loose gravel, or rocky inclines. I didn't have any issues with self steering at low PSI when I had the Kenda on. I found the Kenda do a little better and roll easier at higher PSI of 20-23 if you do mostly paved roads and want higher speeds. The only bad thing about the Kenda are the knobbies are so small and spaced out and don't have a large contact patch. The kenda tires can feel a little squirrelly at higher speeds on turns if you are +15 mph.
I kept my kenda between 19-22 psi to kinda split the difference between work commuting and riding mostly hard packed trails for fun. I just used the throttle if I hit any sandy spots on the trail with the PSI that high. I got less than 1000 miles from my rear Kenda tires and switched to Vee8 120 tpi 26X4 tires. I run those around the same PSI and they are way more stable during high speed turns compared to the Kenda tires. I'm +1600 miles on the Vee8 tires and they only look about 1/4 to 1/3 worn.
One difference I noticed once switching to Vee8 tires was they rolled so much easier, less road noise, more stable in turns, less flats, better acceleration, less effort to pedal, and my range increased a little bit. I would never go back to Kenda tires again.
Me: 270 lbs
Gear: 10-12 lbs (commuter back pack, topeak rack bag w/ panniers)
Rad: 72 lbs (rack, suspension seatpost, cloud-9, aux headlights with battery)
Current PSI: 21-23
+5500 miles between two 2016 Radrovers
