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19" Impact Reagent Unicycle - Black (42mm)


The Reagent is Impacts flagship Street and Flatland unicycle. Combining latest technologies with years of rider’s experience.


Primary Discipline: Street, Flatland
Secondary Disciplines: Trials

The Reagent is Impact’s all-round urban unicycle. Featuring a square crown frame ideal for coasting and wheel walk based tricks, this unicycle can also be used for trials and street thanks to its 19” wheel.

Sporting 130mm cranks, this unicycle is ideal for all-round riding, and can be modified with 118mm cranks for smoother flatland lines, 130mm Groovy cranks for flips and rolls, or 140mm Eiffel cranks for Trials. (For pure flatland riding, the Impact Sylph unicycle may be an appropriate alternative)

Saddle: Impact Naomi Unicycle Saddle – Black
Seatpost: Impact Unify Unicycle Seatpost 350mm (27.2)
Seatclamp: Impact ’1 Bolt Seatpost Clamp – White (31.8mm)
Frame: 20′ Impact Reagent/Sylph Pro Frame – Black (42mm)
Hub: Impact  ISIS CrMO 36 spokes – White (42mm)
Cranks: Impact Groovy Cranks -130mm
Pedals: Nimbus Plastic Pedals – Black
Spokes: Stainless Black ED Finish
Rim: Impact 47mm Wide Rim – White
Rim Tape: Black
Tyre: Maxxis Creepy-Crawler Tyre – 20′ x 2.5"

Weight: 4.85kg

Recommended leg length sizes for unicycle:
Standard seatpost: Minimum - 72cm (28.3"), Maximum - 86cm (33.9")
Cutdown seatpost: Minimum - 62cm (24.4") What does cutdown mean?
These sizes are measured from crotch to floor wearing shoes

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For more information check out impactunicycles.com

More Information
Unicycle Brand
Unicycle Type
Wheel Size
19" - ISO387
Rim Width
Frame Colour
Crank Length
Crank Type
Number of Spokes
36 Hole
Bearing Size
Bearing Spacing
Rim Colour
Pedal Colour
Seatpost Type
Standard - Aluminium
Seatpost Diameter
Seatpost Length
Seatpost Clamp Colour
Seatpost Clamp Size
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   Frequently Asked Questions and Answers

  • General Unicycle maintenance

    Unicycles are not complicated but they do take a little bit of maintaining. Here are some of the key points:

    Creaking Cranks

    Stop riding immediately and tighten! If these are left they will destroy the cranks and hub. The creak comes ...
    Read more

  • What does "Cut-Down" mean?

    What does "Cut-Down" mean?

    Beacuse a unicycle saddle is directly above the tyre, when it is pushed down the seatpost will hit the tyre. So the cut down measurement you see on our unicycles is the lowest the saddle can go with the seatpost cut...
    Read more

  • Impact Unicycle Instructions

    Please select your Unicycle from the list below.

    All our instructions are PDF based, you will need a PDF viewer to use the links below. We recommend Adobe Acrobat Reader, which is a free, trusted global standard for viewing PDFs. You can downlo...
    Read more

  • Impact Unicycles Manufacturers Page

    Impact Unicycles is the best manufacturer in the world for trials and flatland unicycles. Although the brand was started in 2009 by the famous French rider Yogi. It is now wholly owned by Unicycle.com. Designed by unicyclists, ridden by world champions...
    Read more

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