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The history of Roisub is the story of David Roi: This is my story. I will not bore you with my past adolescence and then go fast until the early 2000s when, passionate about spearfishing, like many people, I started to change my speargun and I do many experiments. I was looking for a system to improve the characteristics of speargun, blackberries speed on the shaft without Increasing the mass of the speargun, because I wanted it remain lean and manoeuvrable.

The simple solution to add rubbers to a traditional system greatly Increases the recoil forces and always pull set with arm stiff and tense and forces you to create speargun too massive and bulky. The rollergun seemed a good solution to reduce the recoil but I still was not satisfied. The recoil in the rollergun is still present, the rubbers on the head are an annoying encumbrance for the maneuverability. Moreover, I'm often forced to use an accessory-loader (which I hate).

And here I am in my garage during the cold winters of a city of Turin to traffic during the night, after putting the kids to sleep, but I  like the enthusiasm who every day discovers a new piece of a puzzle. The most interesting piece of this puzzle is a completely random discovery, who knows how many the thought but will make it effective and valid.That is a story can be told only after many trials and many hours in the water, I had a lot of perseverance and willingness to improve. and here I am to transform one of my rollergun to get the speargun blackberries suited to my raids along the coast.

First, I divide in half the two rubbers and connect them with a dyneema. Here's what I get:

  • Only the dyneema runs on the pulleys and no more rubber
  • The pulleys become much thinner
  • No rubber makes bulky head
  • The loading is as simple as in the traditional, grab the rubbers and I do not use accessory-loader
  • The recoil is reduced further, almost to disappear
  • The system is accurate, quiet and simple

Great, I did not know it but I just had invented the FUSION , a system suitable for speargun medium length with light shaft, the speargun suitable to my favorite fishing spot, I scratch on the rocks, with alternating aspects and ambush, a speargun for everyone, simple, a lightweight shaft that travels fast, quiet and accurate. Years of tests and attempts have allowed me to perfect the system that today Roisub offers with its RobinHood.

The FUSION solve the problems of light fishing with light shafts. To obtain the same advantages with heavy arrows I need a system for transforming the energy. And what is better than a system that transforms the power of multiple rubbers to distribute this progression by and turn it into pure speed: this solution is called system DEMO !!!

The ROISUB, the firm, founded in 2012 and is now grown up, has spread like a virus to those who have tasted its systems and is structured to spread throughout the world the systems FUSION and DEMO, which have given rise to many derived systems and now we are offering to all the spearfishers our spearguns Robin Hood and Michelangelo. 

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Roisub Axle Pin for Invert Pulley
Roisub solid 6mm 316 stainless steel axle with m6 threaded ends, washers and nylock nuts.  ..
$12.50
Ex Tax: $11.36
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Roisub Bridge Line Guide
Roisub Bridge Line guide for eliminating the possibility of entanglement of shooting line on inve..
$8.95
Ex Tax: $8.14
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Roisub D2 Loading Butt
 Roisub Loading Butt (for  Roisub Michelangelo handle). The special sternal s..
$49.95
Ex Tax: $45.41
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Roisub DIY Rubber Kit - Demo 3
Roisub DIY Rubber Kit - Demo 3 - takes the guess work out of making your new invert rubbers. ..
$99.00
Ex Tax: $90.00
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Roisub Invert Pulley With Acetyl Bearing (Single)
Price is for single Invert Pulley with a single acetyl bearing.  These pulleys are the h..
$25.95
Ex Tax: $23.59
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Roisub Precision Adhesive Barrel Trim Weight
This innovative product from Roisub offers a simple and effective solution for trimming and balan..
$6.95
Ex Tax: $6.32
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Roisub Prisma Simple Invert Roller Head
The Roisub Prisma Simple Invert Roller Head has centralised yet moveable and replaceable dyneema ..
$149.00
Ex Tax: $135.45
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Roisub Prisma TS (Torlon System) Invert Roller Head
The Prism TS Head is one of the top the of the range in Roisub Invert Roller Heads - as used in R..
$199.00
Ex Tax: $180.91
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Roisub Shark System - Reel Mount & Loading Hooks
The innovative Roisub Shark System provides a stand-off block for reel mounting, for mounting lin..
$99.00
Ex Tax: $90.00
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Roisub Shooting Line Guide
Roisub Shooting Line guide for eliminating the possibility of entanglement of shooting line on in..
$8.95
Ex Tax: $8.14
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Roisub TS (Torlon System) Invert Pulley (Single)
The TS (Torlon System) Invert Pulley is the top the of the range - as used in all Roisub speargun..
$42.95
Ex Tax: $39.05
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Roisub Wood TS (Torlon System) Invert Head Kit
This kit is designed for wood speargun and allows the installation of amy of the Roisub invert ro..
$159.00
Ex Tax: $144.55
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RoisubTS (Torlon System) Invert Roller Head
The TS Head is top the of the range in Roisub Invert Roller Heads - as used in all Roisub speargu..
$220.00
Ex Tax: $200.00
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