There here. The new Dunlop MX 31 (soft) and MX 51 ( Med/Hard)
They are replacing the D756 motocross tire.
I usually go with the bridgestone 403/404 combo on my 450 and was looking for
a rear for the Berg but wasn't impressed with the 110/100/18 they offered.
I have a 120/80/19 on the 450...