I've run TSL's & Irok's. Currently back to Irok's. I'll never run TSL's again unless it's a trail only rig. It's hard to believe these are bias ply tires. I only run the 36 inchers though & when I balanced them, the most that one side took was 4.25 ounces. With the TSL's, I was at 16 ounces on one side average per tire.
I'm lovin' the Irok's. Great in snow, decent on ice, & when aired down to 10 psi, they're fantastic on the trail (rocky trails).