20“ bike for future trail riders with comfortable and easily controllable geometry for the sheer joy of „first big“ bike. Lightweight alloy fork, light wheelset, easy gear shifting 1x7 MicroSHIFT, disc brakes, quality Schwalbe tires, accessories. All of these have one goal – to show the kids that a bike is fun.
  • Junior Trail Geometry and 100% fun factor design approach
  • Lightweight alloy fork
  • MicroSHIFT 1x7 28 x 12-28
  • TEKTRO mechanical disc brakes
  • Tires Schwalbe Crazy Bob, 20x2.10"

  • COLOUR Gloss Dark Red/Black/White
  • FRAME Alloy Al-6061 T6 Custom tubing, Junior Trail Geometry, Shark Spine Semi 20", OLD 135x9, BB BSA 68mm, Disc Brake I.S. 51mm mount, Fender Ready Dropout, Replaceable RD Hanger
  • HEAD SET CH290TBW, 1-1/8"
  • FORK Blizz 20", Alloy Custom Tubing, Ahead 1-1/8", Disc Brake IS standard, QR Type
  • SIZES 10.0"

  • GEARS 1x7
  • SHIFTER microSHIFT DS45-7R, 7-speed
  • REAR DERAILLEUR microSHIFT RD-M21SS, Super Short cage
  • CRANKSET Wheel Top SXB4BL-MS, 28T
  • BOTTOM BRACKET Thun Topaz 120mm, BSA, shell 68mm
  • CHAIN KMC Z8.3
  • PEDALS Marwi SP-202

  • HANDLEBAR ONE1 Alloy, MTB AL-153BT, 10° backsweep, 30mm rise, 560mm, 25.4mm
  • STEM ONE1 MAS-M60368 Alloy, 25.4xE35mm, 15°
  • GRIPS Velo VL-G311
  • BRAKES Tektro MD-M280, 160/160 rotor, mechanical disc brake
  • SADDLE ONE1 Junior
  • SEAT POST ONE1 Alloy, SP C207, 27.2x230mm

  • FRONT HUB ONE1 KTTD8F, 24H, M9x100mm, QR Type
  • REAR HUB ONE1 KTTD2R, 24H, M10x135, CASSETE, QR Type
  • RIMS Stars J19SD, 24H
  • TIRES Schwalbe Crazy Bob, 20x2.10"
  • SPOKES Sapim Galvanized Black

  • WEIGHT* 9.8 Kg

Weight is set for M sized frame unless stated otherwise. We focus on maximum reliability, so cutting some grams down is not our priority! The weight is measured as the each bike specification shows.

Frame Size 10"
10": 20"
SEAT TUBE LENGTH (mm) 10": 255
seat tube angle degree 10": 72
REAch (mm) 10": 323
STACK HEIGHT (MM) 10": 420
HEAD TUBE LENGTH (mm) 10": 100
head tube angle degree 10": 68
CHAINSTAY LENGTH (mm) 10": 355
bb drop (mm) 10": 15
WHEELBASE (mm) 10": 871
Handlebar Width (mm) 10": 560 - R30
Stem Length (mm) 10": 35
Crank Length (mm) 10": 127
seat post lenght (mm) 10": 230

Frame size

We reccomend *

* The recommendation covers most common body types. Always try the bike yourself at the nearest shop!

Manufacturers reserve the right to vary specifiations, including colors, with or without notice at such times in such manner as deemed appropriate. Major as well as minor changes may be involved. Every effort, however, is made to ensure the accuracy of the particulars contained in this presentation. Consult your Dealer for details regarding the specifications of any featured product. This presentation shall not constitute - under any circumstances whatsoever - an offer by the Company to any individual. All sales are made by the Distributor or Dealer subject to and with the benefit of the standard Conditions of Sale and Warranty provided by the Distributor or Dealer, copies of which may be obtained upon request. While efforts are made to ensure specification accuracy cannot always immediately reflect either change in specification or in some isolated cases the provision of a particular feature. Customers are always advised to discuss specific details with the supplying Dealer, especially if a selection is dependent upon one of the features advertised.* The range of the e-bike depends on many factors such as the rider's weight, the track profile, the level of assistance, gear settings, the wind, etc., so the information is indicative and may vary.

Nearest shops

Kola Pešek a syn I

1267 km away

U Elekrárny 306

53002 Pardubice - Čeperka

Bicicletaria Azores

4054 km away

R. do Espírito Santo

9500-337 Fajã de Baixo


Tel.: +351 913 473 453

Picton Cycles

5250 km away

High St 11-13

L15 8HE Liverpool

Bike Zone - Povoa de Varzim

5259 km away

R. Gomes de Amorim

4490-509 Póvoa de Varzim


Tel.: +351 936 546 431

We strongly recommend buying our products from authorized dealers only.

Professionals who can advise you the best bike fits your riding style and subsequent service.

Rock Machine Research&Development

Passion. Mission.

If you want to burn, be on fire! From the first pencil sketch, through prototype testing and debugging to the finished product tested in the most rigorous labs by the engineers and on the trails by our ambassadors and us.

See you on the trail!

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