Bigger Scrambler Tyres?

Greetings everyone,

My rubber is over five years and nearing the end. (Pirelli Scorpion trails) They were already fitted when I bought the bike.

I am looking at something a little bit more knobbly replacement, I know tyre choice can split the room but Im looking at the Pirelli STR Rally for my bike.

My stock tyre sizes for my 2013 Scrambler are 130/80-17 rear and 100/90-19 front.

I am aware people have upsized from this but thoughts from the floor before I go ahead would be welcome. I know the profile may change somewhat but to what extent will safety and efficiency be compromised?

Id like a 150 rear and a 110 front. The bloke on youtube, Rob Hamilton (aka Motofeelz, has done it, Hi Rob if your a member here) and he loves it and claims no issues? He has the Street Scrambler tho, but Im sure my water cooled and his still share the same rim size?? Happy to stand corrected there.

Any input and where best to buy here in Brisbane would be great.

Thanks

cheers guys.