Wilton

Hello everyone, I'm currently driving a Typhoon 125 but soon I'm going to be moving up to my first geared bike and after doing various research, I've became very fond of the DTX125. I think it would be ideal for me but the only problem is I really do think the tyres are too small (width wise), which leads me to my question - could I put bigger tyres on a DTX125? What would it affect? What would be the cost? What make of tyre would you suggest? Is it a simple no? Any information would be helpful.