I HAVE HARD RUBBER TIRES.THEY ARE D-252 MADE BY MARTIN WHEEL. THEY ARE NO LONGER MADE. THE TIRE IS 10.5X1.75 INNER DIA. IS 7 3/4". I AM LOOKING FOR TWO OF THESE TO PUT ON A MOWER ON A GO KART MY DAD BUILT FOR ME OVER 5 I5 YEARS AGO. I NOW HAVE A GRANDSON I WOULD LOVE TO PUT IN IT. THANKS FOR YOUR HELP. DANIEL.
