Look at your wheels / tires, This O-ring is for 7 8 inch 2 piece rims with 3 bolt hubs only. Look at the pictures to be sure this will fit your machine, some machines have had wheels replaced and your wheels may take a smaller oring. Fits Honda: - ATC250R 1981 ONLY (unless your ATC 250R has 7 or 8 inch wheels with 3 hole hub.) Buy as many as you need, we can ship today, We package well and ship very fast. After you get your old wheels off and rims split apart, make sure you clean up all rust and crud out of the O-Ring groove mount area, Paint the surface if needed. I like to use Di-Electric Grease or a silicone base grease to put on the O-Ring to lubricate it and keep it stuck in the proper location. If it moves out of alignment, you may have to take the rims apart again.