JD 4100 Need Tires For

[nforktractor]

Hi, I recently purchased a used 1998 JD 4100 and the tires are pretty worn out, can anybody tell me where would be the best place to purchase new tires, looking for turf type tires, and, the sizes seem a bit odd, 23x8.50x12 on the front and 315x75Dx15 for the rear, and currently has the Bridgestone AG Mowers, Thanks,

 

[2001 JD4110]

my fronts are starting to get down there too....