I have developed a slow leak in one front Titan 16x7.50-8 tire on the 523Dxi. I will be replacing them with Vredestein V-61 rib tires to provide better steering when using the snowthrower. My problem is the stock tire is what I would call an odd size and only a turf pattern is available. The V-61 comes in two applicable sizes (I know there is a six inch as well) 16x6.50-8 and 18x8.50-8. Has anyone purchased both sizes for their tractors? I am inclined to go with the 18x8.50-8 as I feel that the original size is a bit small for the additional weight of the diesel. My concern is with leveling the mower deck with the larger tire. It is close to two inches extra diameter (.9" rise). V-61 16x6.50-8 = 16.7" diameter and 6.7" widthV-61 18x8.50-8 = 18.3" diameter and 8.3" widthCarlisle Turf Master = 16.5" Diameter and 7.0" width