
If you want to know more about stabilizers, dampeners and vibration in archery, I would recommend reading the following article: ‘’Stabilizers – how they work and what to buy’’Īccording to Hoyt having dampeners directly on your limbs directly removes additional vibration. Dampeners are one way to combat vibration, which are often used in combination with stabilizers. In archery we obsess about vibration, because it makes your shots less accurate. Therefore most beginning archers start with an ILF bow. Sadly this isn’t the case for the Formula fitting, since the fitting is mostly used by archers with deep pockets there are no cheap options available.
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Therefore, cheap beginner limbs and expensive professional limbs can both be purchased with an ILF fitting. Since so many manufacturers have adopted this fitting, you can get really cheap limbs, but also very expensive. Therefore you can mix and match risers from different manufacturers. Since so many manufacturers adopted the ILF fitting you have hundreds of choices of limbs. There is one significant difference, between ILF and Formula and that is compatibility. In the Olympic Games archers shoot with both Formula and ILF limbs and there doesn’t seem to be a significant difference. In general these differences don’t really make a big difference. Also the dampeners allow you to additionally dampen any vibration.

According to Hoyt these features offer more stability because the longer limb has a different stress curve. We now know that Hoyt introduced both the ILF and the Formula fitting, but what is the big difference? Well there are two distinct mechanical differences, the limb fitting is longer and it features a bushing to attach a dampener. Since 2009 only a few manufacturers have adopted the Formula fitting and in general most Formula limbs and risers tend to be very expensive. In 2009 Hoyt introduced the Formula fitting, although the fitting is very similar, they claim that you can shoot more accurate with it.

Since more and more manufacturers used the fitting, most archers started to call it the International Limb Fitting (ILF). Since Hoyt was and still is the leading brand in target archery, most manufacturers switched to the Grand Prix fitting. Therefore it was impossible to assemble a bow with limbs and a riser from different manufacturers. Before this fitting was introduced every bow manufacturer had their own proprietary limb fitting. The fitting was very popular, because it was very easy to add limbs, and you could adjust the tiller and center shot.

Originally the ILF fitting was introduced as the Excel fitting, since the entire Excel line was equipped with this fitting. The fitting we now know as ILF was first introduced by Hoyt in the 1980. To explain the difference between ILF and Formula, we need to dive into the history of both fittings.
