12Y 13Y 1Y 2Y 3Y 4Y/5W 5Y/6W 6Y/7W 7Y/8W 8Y/9W 9M 10M 11M 12M 13M 14M 15M
USA YOUTH (Y) 12Y 13Y 1Y 2Y 3Y 4Y 5Y 6Y 7Y 8Y  
USA WOMEN (W)   5W 6W 7W 8W 9W 10W  
USA MEN (M)   9M 10M 11M 12M 13M 14M 15M
 UK 11 12 13 1 2 3 4 5 6 7 8 9 10 11 12 13 14
 EURO 30 31 32 33 34 35 36.5 38 39 40.5 42 43 44.5 45.5 47.5 48.5 49.5
 JAPAN/CM 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

Want new wheels but don't know your size?

Check the inside of the wheel well on the bottom of your Heelys! You will see either SMALL, MEDIUM, or LARGE.