Since you spell tires wrong, you must be in the old world. Go to ebay and search for car like the one you own. Tires will pop up usually with the toy's listings. Have seen a German guy who makes a lot of sizes for front and rear. Also check out tire charts at dealers like pendle, who usually list a couple tire brands and toys they fit on. Other dealers make tires stateside but do not know if you can buy them. Usually you will find rear only because fronts do not matter because slots run on guide and rears. Once owned a scaly furry 40 so know they make replacement tires for it. But your daughters may be faster cause girls are usually better racers.