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Impact 19" Athmos Unicycle - Black


Product Description

The Athmos unicycle is especialy dedicated to trial riders with a budget in mind. Sharp and balanced, this unicycle will help the trials rider to improve the level of riding to the next level. This Unicycle would be a perfect fit for beginners and young riders.


  • Saddle:

Impact Athmos, with lift handle

  • Seat post:

25.4mm x 300mm steel, welded rectangular mounting bracket, 4 hole

  • Seat post clamp:

Impact (white) single bolt, aluminum

  • Frame:

Impact Athmos (black) steel, semi round flat top, stamped bearing clamps

  • Hub/axle:

Impact ISIS (white) 36H, high flange, crMo spindle, 100mm center bearing to center bearing

  • Spokes:

14G stainless black (164mm in length for 3X) with silver nipples

  • Rim:

Impact Athmos (white) 36H, 47mm wide, reinforced eyelets, doublewall, offset spokes, aluminum

  • Rim strip:


  • Tube size:

Innova 20" x 2.125

  • Tire:

Bike Trial 19" x 2.5". This is a specific tire for this rim. A regular 20" tire cannot fit this rim.

  • Crank arms:

Impact Athmos (black) 140mm, aluminum, 9/16 threads

  • Pedals:

Wellgo Block (black) steel spindle, plastic, 9/16 threads

  • Bearings:

42mm x 22mm

  • Approx. cycle weight:

13 lbs.

Recommended leg length sizes for unicycle:


  • Standard seatpost: Minimum - 74cm (29.1"), Maximum - 86.5cm (34.1")
  • Cutdown seatpost: Minimum - 62.5cm (24.6")
  • These sizes are measured from crotch to floor wearing shoes


Minimum Inseam Length:
25" (64cm)
Type - Unicycle:
Type - Seatpost Clamp:
Single Bolt - 25.4mm
Seatpost - Diameter:
Color - Frame:
Color - Rim:
Type - Crank:
Crank Length:
Type - Pedal:
Bearing Size:
Cycle Weight:
13 lbs.
Wheel Size:
19 inch
Write Review

  1. Best unicycle ever 5 Star Review

    Posted by on Oct 6th 2013

    Great unicycle! It is very quality, and it is light. It holds up well also, I have done some pretty decent trials on it and it has handled very well.

  2. Overall a good choice if you're looking for a durable light trials uni 5 Star Review

    Posted by on Sep 22nd 2013

    I was looking for a uni for "old man trials" - learning to hop/drop off of small stuff, ride skinnies, and generally improve my muni skills. I'm not looking to do anything youtube worthy, because I have a job and family and don't want to spend time in the local emergency room. More importantly, I wanted to learn this stuff on a smaller wheel b/c falling off my 26 gets pretty painful after a while, and I don't want to beat the hell out of it while learning to do the stuff mentioned above.

    So, I wanted a durable uni that would not break while I lightly tortured it, but would not break the bank either. I think this one fits the bill nicely.

    It seems well made. The pressed bearing holders look a bit cheezy, but what do you want for the price? Other than that, it seems *really* solid and very well built. I was worried about the 1-bolt seat clamp letting the seat spin on hard wipeouts, but with the knurled seatpost, it hasn't budged a single time. The seat is on as straight as the day I set it.

    The athmos seat is pretty comfortable for dinking around. It's trim, and a bit narrower than my KH freeride seat. It's also more rounded in profile, but the support seems nice, without crunching the family jewels. I wouldn't want to ride miles and miles on this one, though. The padding on top is a bit skimpy. But, that does make it easier to get in and out of the saddle. All and all, I like the saddle for what it was designed for.

    My uni came in at 12.4 pounds, so it's not a featherweight, but it aint a torker DX either. I think it's reasonably lightweight for the money. It feels pretty snappy when pedaling and stopping too. So, no complaints there.

    Overall, if you are looking for a uni that is *signifcantly* tougher than the starter 20" models, don't want to spend big bucks, and you don't need a trials uni that will survive being run over by a car, this one is a good choice. I have no regrets about my purchase.