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20+ Lbs. of
Adjustment - One Set of Limbs We talk to countless parents each
season who would consider investing in good quality archery equipment for
their sons or daughters, but they don't want the kids to outgrow the
equipment in just a season or two. We understand this is a valid
concern. Cheap plastic toy bows are one thing......but good
quality micro-class compound bow setups are quite another. And it
just isn't reasonable to be replacing a young shooter's $200+ setup
every year or two. As a kid's strength (draw weight) and draw
length increase, a good youth bow must be capable of growing with them.
If not, it must be upgraded or replaced. So, the obvious solution is to design a bow with more on-board adjustment capabilities. And with regards to draw length, bow manufacturers have indeed done a great job. Many of today's popular youth bows have large sweeping draw length ranges (usually via a sliding module system). So as the child gets taller and taller, the draw length can be easily "let-out" to accommodate their increasing size. But the issue of DRAW WEIGHT has always been more problematic. Virtually all bows, even youth bows, come with only a 10 pound draw weight adjustment range. A compound bow's draw weight is chiefly controlled by the bow's limbs and the deflection (pre-bend) placed on those limbs. The stiffer the limb, the more draw weight the bow will have. And while a bow's limb can be made with virtually any stiffness, the properties of the limb materials and the design of most limb cups only allow a typical limb set to be adjusted within a narrow 10 pound draw weight range. On most youth bows, you must pick 20-30# limbs, or 30-40# limbs, or 40-50# limbs to start. So if your youngster is capable of
pulling 25 lbs. of draw weight, and you choose a 20-30# bow, you'll only
be able to adjust the bow up to it's 30# maximum. So what happens
the next year? Or two years later, when the bigger/stronger
youngster is able to pull perhaps 35 or 40#? In most cases, the
bow would need to be replaced or have heavier limbs installed (assuming heavier limbs are still available when
you need them). And unfortunately, the cost of new limbs is often $100 or more
including installation. |
For a standard factory-built bow, there is no visual difference in a 20-30#, a 30-40#, or a 40-50# bow. They all look the same. Regardless of which limb (stiffness) is installed, the bow's axle-to-axle length, brace height, and string specifications remain constant. This keeps the bow's advertised specifications neat and tidy. But this also means you're stuck with a narrow 10 lb. range of draw weight adjustment on any particular set of limbs. |
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O/S
Custom Strings: How it WorksThe "O/S" stands for "oversize". O/S custom strings are simply custom made longer-than-standard strings and/or control cables which are designed to decrease a bow's standard limb deflection (pre-bend). As we mentioned earlier, a bow's draw weight is determined by the stiffness and amount of pre-bend in the bow's limb. And while only a limb change can alter the limb stiffness, careful manipulation of the string/cable lengths can safely decrease the static limb deflection - and lower the bow's draw weight range. For
a typical twin-cam bow, installing .50-.75" O/S buss-cables will decrease the
bow's peak weight by approximately 10 lbs., effectively converting a
40-50# bow, for example, into a 30-40# bow. Of course, the process is more
complex when working with single and hybrid cam bows. For single and
hybrid systems, all the string elements must be changed, as cam timing and nock
travel issues prevent simple cable changes. But for a regular twin-cam
bow, it's an easy modification that allows growing kids to get twice as much
service-time from their new compound bows. Can
I Convert the Bow Back to "Original"?Yes. In fact, that's the point of the entire concept. When we perform an O/S Custom String modification, we build entirely new strings and/or cables to install on the bow. But we also include the bow's original factory strings separately for you to keep. And when your child is ready to graduate from the lower (modified) weight range up to the bow's original weight range, you can just remove the O/S Custom strings, re-install the original factory strings.....and viola! The bow will be back to it's original specifications. What is the cost of this service? There is an initial charge ($20 for twin-cam bows, $40 for single & hybrid cams bows) for the O/S Custom String option. But in the long-run, it really costs you nothing. In most cases, by the time your youngster is ready to move-up to the heavier draw weight range, it will be about time to change the strings anyway - as a matter of good maintenance. But instead of buying new strings, you'll already have the bow's original strings which you can use. So in the end, the O/S Custom String job really is a money-saver in more ways than one. How do the O/S Custom Strings Affect the Bow's Specifications? Typically, installing O/S Custom Strings slightly increases the bow's axle-to-axle length, and slightly decreases the bow's brace height and draw length range. Here is an example of how a .625" O/S Custom String Job affects the specifications on the popular Parker Buckshot micro-class bow.
How do I order a Bow with O/S
Custom Strings?
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