Did you know that a properly aligned rear wheel will extend the life of your chain and sprockets? How many times do you have to check your wheel alignment when adjusting your chain or replacing the rear wheel? I'm guessing more than a couple times. We know how it goes, a turn of the wrench on this side, and turn on the other, now how many notches are in front of the mark, and oh wait, what about the mark on the other side... Familiar? If so, then you may want to check out our axle blocks. We've taken the guess work out of ensuring an aligned rear wheel. Simply install them and line up the numbers. Yes, we've made it that easy!