|Sizing & Installation Notes: |
Please refer to the bow manufacturer module charts for fitment. Over the years, some series of modules have been used in multiple bows (bow manufacturers tend to carry cam systems through multiple seasons and models). A module that makes a 29" draw length in one bow, may make 30", or even 27.5" in another model. To make it even more challenging, bow manufacturers often lease cam systems from one another, so sometimes a module for a brand X bow actually fits brand Y bows as well. It can be quite a mess to decipher into accurate fitment charts - at least when working from the module number backwards. The only sure way to know what draw length a particular module will yield in any particular bow is to refer to the original specification chart for that exact model bow.
However, most modules sizes represent 1 inch draw length increments, with higher numbers often yielding longer draw lengths and lower numbers yielding shorter draw lengths. In this case, switching from a #4 module to a #6 module increases the bow's draw length by 2 inches. Easy enough, but sometimes the numbering sequence works backwards, and every once in a while the sizing numbers do not even represent whole numbers in draw length yields. We know that's confusing, but we didn't engineer these bows - we just work here. Fortunately, there's another way to choose the right module. If you can't find any info on your bow at all, you can usually use this basic rule of thumb: the longer the leading edge of the module is, the longer the draw length it yields. That's why we use the penny to give scale to our module photographs. So if the modules get bigger as the numbers increase, you can assume larger numbers mean longer draw lengths. If the modules get small as the numbers increase, you can assume larger numbers mean shorter draw lengths. If you look at your current module and use its number as a starting point, it's not too difficult to figure out what module will give you the draw length increase/decrease you need. But again, the only way to know for sure is to chase down the official mod chart for your bow. Contact your bow's manufacturer so see if mod data is still available.
Also note, most modules can safely be installed with just a simple hex wrench, but some will require professional surgery (use of a bow press, corresponding adjustments of draw stop pegs, cable boss rerouting, etc.). Make sure you know what you're doing before you start unbolting pieces of your cams. Sometimes modules are under tension, even when the bow is at rest.