Well guys for those of u that are wondering how good those plugs are , well i purchase my 9 with 800 miles from a gentleman in nj. After putting roughly 10k miles, it was time for a new rear tire . Upon removing the rear tire i notice it had a mushroom plug. Now keep in mind i am the type of guy that goes thru the whole pre ride checks. Tire pressure was always steady. And i tell u i rode that bike hard in excess of well over 100 miles an hour. My opinion, its a great product to have .