SharkFace

Hello, I've started working on a scrambler project, using a xj600. https://yourimageshare.com/ib/OxSQ6TcdyQ https://yourimageshare.com/ib/2w25wi8qqg But I have hit somewhat of a problem. My tyres are 110-80-17 and 130-70-18 and I can't find off road tyres with those sizes. I was thinking of using 120-90-17(not tubless) and 130-80-18(tubeless) instead. Would this work? Any thoughts? Thank you.