i was wonderin how much top end i would lose if i bought 20x11x9 razar's on .190 douglas rims for my blaster, 2nd if they would fit, and third if i would order them from rocky mountain atv would i have to tell them my bolt pattern. any replies would be greatly appreciated, Thanks

they look alsome and you should not loose and speed.my cousinn has them.

Since you are in effect, gearing down slightly by cutting an inch off your tire height, you would gain a little low end & lose a little on top. If you felt this was unacceptible, you could regain the top end & then some by adding a one tooth larger c/s sprocket.
Rocky Mtn can tell you whether they would fit & would have the info on hole patterns. I think the tire you mention is 1" wider than stock so shouldn't be a problem.
Be aware, however, that the Razr uses a soft rubber compound which is very good for traction but tends to wear faster than some tires with harder compounds, especially on hard terrain.

Another thing about the Razrs....

although they come in 6 ply now the guys at my shop said the 4 ply Holeshot is actually thicker and is much more puncture resistant.

Take that for what its worth.
just my $.02

i thought the holeshots wear quicker....i just got some razers 20x11x9 and they are the best