ok so i have a cr250 i wanna try out supermoto with.. my stock tire sizes are 80/100-21 for the front and 110/90-19 for the back, i found distanzias in my sizes.. i think.. front: 90/90-21 AND 90/90H-21 whats the H for? can i use it? wats the difference? rear: 110/80HR-19, 110/80R-19, 100/90H-19 whats the R, H, and HR for? which sizes distanzias should i use? can i use any?