Hi AVB, Yes we have had the Flinstones out here in the colonies for probably 50 years although this was not in my thinking at the time. I guess I will have to get out and mow a few lawns to see how they stand up. The problem with out Victa wheels is that they are the only mower wheel that uses a 9/16th shaft, all the others use 1/2 inch Bit of paint, didn't come out as well as I would have liked but certainly looks better that with the insert missing. Put them on the scales, with concrete 740 grams, wheel with plastic insert 320 grams and the original Victa solid rubber wheel 780 grams so my concrete insert ones are not over the top weight wise.