M12XC = Intermediate Terrain. S12XC = Soft Terrain. 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.
"This is the third set of the Michelin "sand" tires that I have purchased. Unbelievable traction!!! We ride in all kinds of conditions, but even on the rocky hard pack these hook up well. My Suzuki DRZ400E and RM250 (2-stroke) as well as my Honda CRF450R all love these tires. Rodger DeCoster says that the best way to spend $100 is to buy a new tire, I agree 100%. Tthe added control from the increased traction is more valuable than a new cam, exhaust, piston............. Most of our bikes have more power than we can use, put your $ into new tires, and enjoy the control. BUT, they should come with decals!"