Depends on whether your 3/4" axle is keyed,splined,or has 2 flat spots to drive the rims..you might be able to find 4 or 5 bolt hubs off another riding mower or garden tractor with the right type of bore to fit..
Or make some yourself..I have seen guys take a front wheel hub/bearing assembly off a FWD car that has the 4.5" or 115MM bolt circle (5 lugs) and press off the bearing and bolt flange,then weld two hubs with the correct bore to the hub ,so it can be mounted on the tractors axle..you can buy thses "weld-a-pulley" hubs at farm supply stores (they use them for sprockets too),for about 5 bucks each,they have set screws to hold them in place on the shaft..
If your axles are the splined, or flat spot type,you'll probably not be able to find hubs that'll match,in that case you could remove the centers off your old rims and use them for hubs if they are flat there,by drilling the 4 0r 5 bolt circle pattern into them..or use only the bore part as hubs to make the FWD car hun fit..
Bear in mind putting bigger tires on will raise the gearing up too,it will go much faster than before,but also have much less pulling power--to regain that you may need a larger sprocket on the rear axle ,or a jack shaft with more pulleys or sprockets to gear it back dowm low enough again..
Or make some yourself..I have seen guys take a front wheel hub/bearing assembly off a FWD car that has the 4.5" or 115MM bolt circle (5 lugs) and press off the bearing and bolt flange,then weld two hubs with the correct bore to the hub ,so it can be mounted on the tractors axle..you can buy thses "weld-a-pulley" hubs at farm supply stores (they use them for sprockets too),for about 5 bucks each,they have set screws to hold them in place on the shaft..
If your axles are the splined, or flat spot type,you'll probably not be able to find hubs that'll match,in that case you could remove the centers off your old rims and use them for hubs if they are flat there,by drilling the 4 0r 5 bolt circle pattern into them..or use only the bore part as hubs to make the FWD car hun fit..
Bear in mind putting bigger tires on will raise the gearing up too,it will go much faster than before,but also have much less pulling power--to regain that you may need a larger sprocket on the rear axle ,or a jack shaft with more pulleys or sprockets to gear it back dowm low enough again..
