As you already know, 2 videos will be shown to you! Both will get you a tutorial about tire grooving. You will learn what to do, how to do it and what you`ll get after you do it! For example, a tire with a closed center rib is perfect for good mileage and it looks good from the outside! Tire grooving can surely be slow but being fast at it doesn`t necessarily mean that it is good. It is always better to take your time and go for the quality! Finally, by watching these videos you will know in the future how to recognize a regrooved tire. Do not forget that many second-hand sellers are regrooving the tires of their vehicle in order to convince potential buyers that they are new.