If your going with 15" wheels you can use a 225/50/15 rear and a 205/50/15 front we’ve done this in the past ,on the Tiger we have at present were using 205s all around, also there are a lot of 205s available from many mfg’s Falken,Dunlop,Yokohama, to name a few, if you decide on 225s for the rear you
will have to look for them. as a side note I’d look a VTOs easy to deal with when we got ours they shipped for free and supplied lug nuts in the deal, sone thing to thing about in todays world 13"&14" wheels and tires are limited.