That patten is MA - OK for sure.
So long as its not claw you can ride it. baSICALLY ANy chocolate block or enduro tread will see you ride no probs, as per firko, though it would only be OK, if you were serious and have an 18" rim you would just go out and buy the michielin X, last you for eva and is the only tyre to use if you want to be at the pointy end, worth 3+ sec a lap min on anything, 9 and cheaper and better value than a $1000 port job)
OUt of curiosity did you notice if that tyre there comes in a 19" by 2.75, 3.75 - 4.00 ?