MS3 - Soft / Intermediate Terrain. MH3 - Intermediate / Hard Terrain. For the M12 and S12 tires, the sizes are as follows: 100/100-18 = Michelin size of 120/90/18. 100/90-19 = Michelin size of 120/80-19. 80/100-21 = Michelin size of 90/90-21. Note: Please check your current tire size to ensure you are ordering the correct replacement size.
"My son is the racer. He is 14 and really halls butt around the track. I need tires I count on keeping him upright. These tires were a super purchase. The tires hook up like no others I have ever had. They look tough and perform tough. These are the ones I will stay with. Motosport service and products are in front for the hole shot!"