I have an IH Cub Cadet 128 with a #2 tiller. I have a good set of original 16 X 6.50-8 front tires on it.
I have a set of this style from my 149
http://www.millertire.com/products/l...f-saver-4-ply/
The tires from 149 steer better.
I have a 2 sets of this style tire.
One set is 23-10.50-12 and the other set is 23-8.50-12. I plan to use the 23-10.50 on my 128/tiller set up to help prevent soil compaction.
You do not need a 6 or 8 ply rear tire on your Cub Cadet. The higher the ply the harder they are to install. Look at the load rating on the sidewall. The 4 ply is more than enough to handle anything you put on your Cub Cadet.
I prefer 2 ply rating.