Bigger tires on Honda crf 250 motard?

Good morning,i'm writing from Italy and i would like to ask you one thing about my Bike Honda crf 250 m. The original back tire is 130/70 r17 and it is not so nice to see,given that the bike could look better with a bigger tire. My question is if it is possible to change from 130/70 17 to 150/70 r 17 whitout changing the wheel. Or at least if 150/70 is too much,till which size i can use bigger tires without changing the wheels. I don't care about police, i mean if it is feasible. Thanks in advance for the answers, any suggestion is welcome.

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