The task was clear: build the lightest junior 29“ for good money. And it turned out well. We complemented the lightweight frame with the custom made alloy fork, we even lightened the handles and brakes and equipped the bike with ONE1 carbon seat post. Shimano Deore 1x11 set provides the gear shifting. The bike geometry was chosen for maximum control off-road, speed on-road, and gravel. Thunder 29 VB is also suitable for shorter adult riders who look for an easy and lightweight 29“ bike.
  • NEW generation frame with specific Junior Trail Geometry and unique "Big wheels for Big smiles" design approach
  • Lightweight alloy fork
  • Rear end MINI BOOST 141 mm
  • NEW SHIMANO DEORE 1x11 30 x 11-51
  • ONE1 carbon seat post
  • Tires WTB Nano Race, 29x2.10"

FRAMESET
  • COLOUR Gloss DVO Green/Gloss Silver/Black
  • FRAME Alloy Al-6061 T6 Custom tubing, Junior Trail Geometry, Shark Spine EVO2 29er, BB BSA 73mm, OLD 141x9, V-brake pivots, Fender&Kickstand Ready Dropout, Replaceable RD Hanger, Inner Cable Routing
  • HEAD SET FSA No.10 Semi-Cartrige, 1-1/8“
  • FORK Thunder 29", Alloy Custom Tubing, Ahead 1-1/8", Disc Brake Post Mount, QR Type
  • SIZES 13.5"(XS), 15"(S)

DRIVETRAIN
  • GEARS 1x11
  • SHIFTER SHIMANO DEORE SL-M5100 RapidFire Plus, 11-speed
  • REAR DERAILLEUR SHIMANO DEORE RD-M5100 Shadow Plus
  • CRANKSET SR Suntour Zeron X1 30T
  • CASSETTE SHIMANO DEORE CS-M5100-11, 11-51T
  • BOTTOM BRACKET SHIMANO SM-BB52, BSA, shell 73mm
  • CHAIN KMC X11
  • PEDALS Marwi SP-400

COMPONENTS
  • HANDLEBAR ONE1 Sport, MHB AL-6045BT, 9° backsweep, 680mm, 31.8mm
  • STEM ONE1 TDS-C342 Alloy, 31.8xE45mm, +3°
  • GRIPS ONE1 VL-G1661D2N, Lock-On
  • BRAKES SHIMANO BL-T4000/BR-T4000, V-brakes
  • SADDLE WTB Volt Sport Junior
  • SEAT POST ONE1 Race Carbon, SP 406ACF, 30.9x300mm

WHEELS
  • FRONT HUB ONE1 KTA55F, 28H, M9x100mm, QR Type
  • REAR HUB ONE1 KTAH8R, 28H, M10x141, CASSETE, QR Type
  • RIMS Stars J19SD, 28H
  • TIRES WTB Nano Race, 29x2.10"
  • SPOKES Sapim Galvanized Black

WEIGHT
  • WEIGHT* 11.2 Kg (XS size)

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.

Wheelsize
Frame Size 13.5" (XS) 15" (S)
13.5" (XS): 29" 15" (S): 29"
SEAT TUBE LENGTH (mm) 13.5" (XS): 343 15" (S): 381
seat tube angle degree 13.5" (XS): 74 15" (S): 74
EFFECTIVE TOP TUBE LENGTH (mm) 13.5" (XS): 560 15" (S): 575
REAch (mm) 13.5" (XS): 397 15" (S): 412
STACK HEIGHT (MM) 13.5" (XS): 570 15" (S): 570
HEAD TUBE LENGTH (mm) 13.5" (XS): 90 15" (S): 90
head tube angle degree 13.5" (XS): 69 15" (S): 69
CHAINSTAY LENGTH (mm) 13.5" (XS): 440 15" (S): 440
bb drop (mm) 13.5" (XS): 55 15" (S): 55
WHEELBASE (mm) 13.5" (XS): 1078 15" (S): 1093
Handlebar Width (mm) 13.5" (XS): 680 15" (S): 680
Stem Length (mm) 13.5" (XS): 45 15" (S): 45
Crank Length (mm) 13.5" (XS): 170 15" (S): 170
seat post lenght (mm) 13.5" (XS): 300 15" (S): 300

Frame size

We reccomend *

13.5" (XS)
15" (S)

* 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

bicicletariaaz@gmail.com

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

povoa@bikezone.pt

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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