wheel for powerworks or greenworks automatic mower

This is a spare tire for the greenworks or powerworks robotic lawnmower. Many people wrote in forums that there is no tire to get from the manufacturer, so i designed my own. I had only the 608 bearings so i printed also an adapter from 6mm to 8mm so ican use the bearings i had. Depending on the 3d Printer accuracy it is necessary to glue the adapter on the axle. Otherwise press it with a clamp on the axle. You can glue one bearings in the wheels side, place the spacer in the wheel and glue the second bearing on the other side.Then you have the two bearings at the outer side of the wheel and the spacer in between. If you print the adapter with skirt, you can leave it on the printed part as limiter for the wheel.