Shinko 723 tires
i just tested these on dirt. I am Running 20 lbs pressure as compromise, and they are far better than the originals on the dirt. Lower pressure would suit the dirt road better, but there are also lots of curvy paved roads in near vicinity. I live on a dirt road and also play on and explore dirt roads nearby with rocky surface and significant elevation changes. I live 2.3 miles from my mailbox, and there is an elevation drop of 900 feet as well in that distance.
These tires seem somewhat similar to trials tires, grippy blocks for gravel and rocks, but not perfect for loose sand. I do not think i would want to go for full-on dirt tires even if they were available in the sizes needed for the Grom. These 723 Shinko may be best compromise available for the 70% street, 30% dirt I tend to ride.
That ohlins shock sure is tempting, but then the forks would need upgrading as well if i really wanted to smooth the bumps. Nah, i think i have spent enough on this bike. Maybe........