Segway with large tires - GIF

[Frank S]

I think if it were me I'd make a couple of drop axle housings for that thing that way it could be geared down since the larger diameter tires would make it want to run probably 3 times as fast as stock only there would be a huge strain on the little motors, droping the body down well below the hub centers would also help the CG and gyro and be much more stable to ride