So far so good little rougher than air filled but better Traction from the weight. I am pushing cedar trees and large rocks in harsh terrain. But have not been in muddy areas yet. They are tough tires. But get help to put them on. They weigh about 300 lbs a tire.for the 12x16.5. Which are actually the same oughter diameter but the rims are 20".How do you like your new McLaren solid tires and their service? I'll be soon getting on the market for solids as well...