One of the question marks hanging over the relatively recent Goodyear Wrangler MT/R asymmetric-tread tyres has been how long they'll last. The set on the 4wdNewz Rubicon has now completed 20,000km and they're down to about 60 per cent. Coming off a diet of various versions of BFG Mud Terrains that doesn't seem very good, but it's similar to some other types of mud tyres. The unusual design of the MT/Rs is meant to combine the on-road advantages of an all-terrain with the off-road requirements for a mud tread and, overall, the tyre has met its mandate. In any type of mud, it's probably as good or just about as good as a BFG, but no match in extreme mud for a Simex or Silverstone.