It turns out that TITAN TIRE sells the ag tire which is the SAME SIZE as the rear turf tire, and fits the 16.1 rim. All numbers the same. For the fronts, no ag tires but the turfs are 27x8.50x15 and you can buy a TITAN Industrial tire the same size!!!!!! No new rims. Of course industrials dont have a deep tread, but only 17/32 or so but I am thinking of going this way. I will check with N.H. dealer on getting them for me, since they will have to install, plus I want some service that I do not want to do, but this may be the solution for others as well. http://www.titanstore.com/info/48D890 not advertising, just a sample http://www.titanstore.com/info/412339