I run Desser 500-5 6 PLY AWBS RETREAD ELITE PREMIUM 2 GROOVE (ELITE). The private strip I operate from is pretty rough and also wet in the spring. I think this is major improvement over stock RV-12 tires.
A word of caution… adding larger/heavier tires/wheels puts additional stress on aluminum gear channel carry-through, not so much from rough ground ops, but in-flight loading. When airplane is in turbulence the spring landing gear oscillates up/down, and depending on severity, the heavy wheels will impart negative loading which can lead to crack formation at the outer clamp mounting holes.
In my opinion, a set of heavy steel plates is needed to sandwich the aluminum channel to spread force of small washer/nut that holds the outer clamp.
Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 670
LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H