Heck, put a CT on the front too.
The BT-45 is actually a REAR MT mounted and run on the front. Some folks have this tire mounted with the side wall Directional Arrow in the opposite direction of normal! I have my BT-45's mounted with the Arrow in the normal position. Having well over 45K miles on BT-45's, I'm currently on my third tire and will continue using this setup on my 6. When mounted the 45 is actually 1/4" narrower than the OEM Tire and is a great "corner carver" when compared to the OEM.
Discount Tire in Ocala refused to mount the tire that was purchased from them on line (see original post). The seemed not to care about it being a care tire going on a MC rim. The said they do not mount anything on MC rims.