Speargun Rubber Band & Wishbone

Speargun Rubber Bands

Spearguns other than pneumatic spearguns are powered with rubber bands. Speargun rubber band is pulled back and hooked into the notch of the spear.
The thicker your speargun rubber band is the harder it will be to load but the more power it will give. On the other hand, you could have two thinner speargun rubber bands that are easy to load but still provide maximum power. Twin 16mm speargun rubber bands are ideal for most kinds of spearfishing.If you are planning to hunt very big fish like tuna that may require several power speargun rubber bands.

Two factors affect a speargun rubber band’s power potential: stretch and diameter. All other things being equal, a 9/16-inch rubber band provides less potential power than a 5/8-inch rubber band. Adding additional rubber bands increases the power potential in a linear fashion (i.e. two 5/8-inch bands yielding 100 pounds (45.4kg) of power potential. Each band, combined, yield 200 pounds (90.7kg). Bands are frequently made of latex and come in diameters of 9/16-, 5/8-, and 3/4-inch. Some speargun rubber bands come with wishbones already installed, although some divers prefer to buy their own band material and install their own wishbones. This is suitable for experienced spearfishermen who have time to spend measuring and cutting their speargun rubber bands. However if you are a beginner you will be much better off buying pre-cut rubber bands designed specifically for your speargun. This ensures you have the right length rubber bands for your gun and that they are made from the most effective materials.

As with any rubber product you need to store speargun rubber bands away from direct sunlight and extremes of heat. Store in a dry, dark place and spray with silicone lube before putting them away to keep them supple.Don’t let a bad spearfishing speargun rubber band ruin a day, or multi-day, hunting trip.



The selection of a wishbone should be based on the design of the spear shaft. Specifically how the shaft is designed to engage the wishbone.

Shafts fall into one of two main categories, those with notches cut into them and those with fins or pins welded onto them to engage the wishbone. There are also hybrids of the two where a small fin is welded in front of a recess ground in the shaft. For the purpose of choosing a wishbone these hybrid shafts equate to mini-fin shafts.

Most notched shafts are designed for use with metal wishbones. The size and shape of the notch determines which of the various metal wishbone types are compatible. V wishbones and cable wishbones will work with most notched shafts as long as the notch is of adequate size. The use of Spectra cord type wishbones is possible with notched shafts as long as the notch is smooth.

Shafts with fins or pins are designed primarily for use with cord wishbones. The size of the fin limits the diameter of the cord used for the wishbone. Mini-fin shafts have short low profile fins (3 – 5mm) and are usually designed to accept only one small diameter cord, like our 1.9mm Spectra, wishbone per fin. Shark fin shafts have larger fins (5 – 8mm) and will accept any size wishbone cord. Small diameter cord like our 1.9 or 2.5mm is usually adequate for shark fin shafts and will allow the engagement or stacking of multiple wishbones on one fin. Our 3mm Spectra cord, on the other hand, should only be used if there is a separate fin for each wishbone.

When choosing new or upgrading your wishbones, be sure to select the correct length of rubber for your speargun and also be sure that the wishbone being used is strong enough to cope with the rubber.


How long do speargun rubber band can be used?

Speargun rubber band is designed to be resistant to water and UV light but it will start to degrade over time and with exposure to the elements. You should be able to use speargun rubber bands quite a few times before they need replaced and you can extend their life by keeping them in a dry, dark place when not in use. Before you use your speargun check the rubber bands over thoroughly for any sign of damage or wear. This could be dangerous as the rubber bands could break under tension if they are worn or damaged. This could cause the shaft to release unexpectedly or the rubber band could snap when you are trying to load the shaft injuring your fingers. You can judge when a rubber  band is getting towards the end of its usefulness when the power in the release starts to decline.


How long should be the speargun rubber bands?

The length and diameter of the speargun rubber bands can affect the overall power. If you have a 90cm speargun then a rubber band measuring 50cm with a 16mm diameter will provide you with a standard, medium strength power ideal for reef and wreck fishing. If you are hunting for larger fish then you can decrease the length of the rubber band to 45cm. This will mean that the rubber band has to be put under more tension to stretch it along the length of the barrel and this will increase the power of the shot. This can result in additional penetration power for the spearhead for larger fish species.


Length 14mm 14mm twin 16mm 16mm twin 18mm 18mm twin 20mm 20mm twin
90 45cm 55cm 50cm 60cm 55cm 65cm 60cm 70cm
100 50cm 60cm 55cm 65cm 60cm 70cm 65cm 75cm
110 55cm 65cm 60cm 70cm 65cm 75cm 70cm 80cm
120 60cm 70cm 65cm 75cm 70cm 80cm 75cm 85cm
130 65cm 75cm 70cm 80cm 75cm 85cm 80cm 90cm
140 70cm 80cm 75cm 85cm 80cm 90cm 85cm 95cm
150 75cm 85cm 80cm 90cm 85cm 95cm 90cm 100cm





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