im going with 19"dirt 18"sand 48 sprocket?

i had a 06 yz250f with 49 sprocket i believe and it did great and lots of torque, i think thats stock size? WR450 has 49 stock, but yamaha didng have the ironman 49 so i bought a 48 and ill be going to a 19" dirt wheel and keep my 18" for sand tire... should i be just fine and not really notice any loss in torque? and maybe gain 4-5mph at top?

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