Since you’re new I’ll tell you, the wheel hubs need to be pushed all the way in until they seat on the end of the axle or you risk losing a wheel and possibly killing someone. If you need to move them out to get your 55″ track width they make spacers but there are limits to how far you can safely space them out depending on how long your hubs are.
Next, if you have the type of hubs where the axle can go all the way through, you need to leave a 1/4″ of axle sticking through to center the wheel.
FAA certified jet engine and aircraft technician,
Nicholson Speedway class champion 2001,
Yamaha KT100 Service Center,
41 years karting experience