Maxxis MA-S1 Update:

I downloaded their tire brochure and it gave information on most of their tires (off road to competition). Since the UTQG rating is based on each tire manufacturer, I wanted to review their ratings to see where the MA-S1 rated. They show the following UTQG ratings:

AC-1 Competition tires as 100

MA-S1 tires as 360 (apx. 30k miles) SUV/LT All Season Performance

MA-P1 tires as 380-440 (40-50k,) Performance Touring

MA-1 tires are 480 (60k miles) Grand Touring

CUV tires are 520 (60k miles) Crossover Premium Touring

MA-T1 tires are 560-720 (60-100k miles). Premium Touring

So it looks like from using Maxxis's own UTQG ratings, the MA-S1 tires may be "stickier" than most of the passenger type tires that they produce.

The MA-S1 tires are a black wall SUV/Light Truck All Season Performance Tire and their P295/50R15, P275/60R15, P255/60R15, and their P245/60R15 are all rated at 44psi for maximum pressure and have the H speed rating (130mph).

I just wanted to throw this out there for reference.