Hi Dan, when you say offroad what type of terrain is it ,the mt21 i found to be the best offroad tyre for all types,wet mud,grass,rocky BUT a lot of road work takes its toll ,the tkc 80 are useless on anything (ask cupid stunt)but rocky terrain and tarmac,it all depends on the terrain you plan to do offroad,
As for M&P i live about 10 miles away and they take a while to get them in ,it took 2-3 weeks for my mt21s to come in but they are cheap at �80 a pair