Nimbus 19" Gremlin Trials Unicycle

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product description

The Nimbus Gremlin trials unicycle is a great trials unicycle with its large volume tire and strong ISIS CroMo hub. Combining one of the lightest tires on the market with super grip and you get this green beast of a unicycle.

The Nimbus Gremlin trials unicycle was designed to go over obstacles without any part of the rider touching the ground. Obstacle courses can be made specifically for trials. Often these obstacles are walls, rails, and many other elements of the urban environment (also known as a session-style sport).

You can also practice trials with standard unicycles but they are not designed to withstand the impacts that this kind of riding can create. The Nimbus Gremlin trials unicycle is specially designed for this type of use. 


  • Saddle: Nimbus Flat Saddle
  • Seat post: Nimbus 25.4mm x 300mm aluminum, welded rectangular mounting bracket, 4 hole
  • Seat post clamp: Nimbus double bolt (black) 28.6mm 
  • Frame: Nimbus II 20" (green) steel, 42mm machined bearing caps
  • Hub/axle: Nimbus ISIS (black) 36H, hardened CrMo spindle, 100 mm center bearing to center bearing 
  • Spokes: 14G stainless black (164mm in length for 3X) with green nipples
  • Rim: Nimbus dominator2 19" (black) 36H, double wall
  • Rim strip: Rim Tape
  • Tube size: Innova 20" x 2.125" 
  • Tire: Maxxis Creepy Crawler 19" x 2.5". This is a specific tire for this rim. A regular 20" tire cannot fit this rim.
  •  Why are 20 x 2.5 tires also called 19” tires?                  

          A. When trials biking was first starting they stipulated that the rear tire must be 20” in diameter. The bike riders wanted a tires with more cushioning for their rear wheel so Monty took a 1” smaller old scooter rim and tire (which is nominally 20" in diameter) and used that instead of the standard 20" tire.  To help differentiate between the two tire sizes the non-standard small rim tires are called 19". 

  • Crank arms: Nimbus VCX 125mm, aluminum, 9/16 threads 
  • Pedals: Nimbus Studded (black) plastic,  steel spindle, 9/16" threads
  • Bearings 42mm x 22mm 
  • Approx. cycle weight: 13 lbs



Minimum Inseam Length:
25" (64cm)
Type - Unicycle:
Type - Seatpost Clamp:
Double Bolt 28.6
Seatpost - Diameter:
Color - Frame:
Color - Rim:
Type - Crank:
Crank Length:
Type - Pedal:
Bearing Size:
Cycle Weight:
13 lbs.
Wheel Size:
19 inch