Yes, I found the Ag tires on Amazon & bought them. Just mounted 1st one. Says on the tire 40 psi max. What are people running for psi with ag tires. You say model came with 2 options for tires, & the book just says 18 psi for back & 14 psi for front. Tractor gets very little use really. To small for me to be comfortable on, really just use to till garden & move heavy things from time to time.Oh goodness, you have the Ag tire setup. Not the turf tires. The B7100 was sold in two tire configurations, with unique wheel rims for each configuration.
6-12 is the tire size you need for your fronts and you can get them from Amazon.
Thanks for everyone's help here, it is very much appreciated.