In any belt driven application, one of your worst problems will always be – the ability to maintain proper tension on the belt. This problem is mostly corrected by using an adjustable base to keep a more constant pull on the belting by adding tension as needed in the opposite direction of the driven assembly. Using an Adjustable Base from us, makes this easy. All you need is an adjustable wrench, in a pinch, to keep things running smoothly. This also allows for easier and faster maintenance for belt changes by giving slack quickly when down time is costly. We offer frames 56 to 449T here. Let us know how we can better serve you.