Helix 150 - Wheel Bolt Pattern
 

Does anyone know the bolt circle for the Helix 150? Thinking about replacing the rear wheels.

I don't know what size the bolt pattern is however yesterday I removed the rear hubs/wheels on my Helix 150 and put on hubs from a honda three wheeler which had the same splined shaft and fit perfectly. I had two brand new 22x12.5x8 Blackwater tires mounted on these honda hubs I never used until I put them on yesterday. Lots more traction and more ground clearance.

I think they are 4x110.

BigE is right, they are 4x110 on all four wheels. Anything from a a Honda 400ex for example will go right on. You have to be careful in the fronts though. If you put a taller wheel on they will rub when the steering is all the way left or right. Generally speaking, the fronts you should leave as they are.