[sdcantrell56]

Originally Posted by jblay

We've estimated that each wheel would be about 1 pound heavier which adds up.

There is no way the wheel would be that much heavier. The wheel minus the bearing insert weighs right around 1 lb with the steel rims. Plastic is less dense but would require much more material to get a workable stiffness from the part. Safe yourself the hassle and go with the Mcmaster 6" wheels