We use the same technologies and frame construction techniques with the Reaction Hybrid Rookie as we do with the adult bikes that inspired it. For example, the gravity cast down tube and 1.5in head tube create a stiff backbone for a bike that, let's be honest, is going to be ridden with healthy enthusiasm. Internally routed cables keep gears shifting smoothly with minimal maintenance, and there's even provision for a simple upgrade to a dropper post for added confidence out on the trail. Feed their sense of adventure - and see the positive reaction.


  • frame Aluminium Superlite, Gravity Casting, Agile Ride Geometry, Tapered Headtube, Internal Cable Routing, Full Integrated Battery, Kickstand/Fender/Carrier Mounting Points
  • size XS (13.5")
  • fork SR Suntour XCR32 LO-R Air, 100mm
  • drive unit Bosch Drive Unit Active Plus Generation 3 (50Nm) Cruise (250Watt)
  • battery Bosch PowerTube 400
  • display Bosch Purion
  • charger Bosch 2A
  • brake system Magura MT Thirty, Front 2-Piston/Rear 2-Piston, Hydr. Disc Brake (180/160)
  • rear derailleur Shimano Deore RD-M4120-SGS, 10-Speed
  • shifters Shimano Deore SL-M4100, Rapidfire-Plus
  • crankset ACID E-Crank, 165mm, 38T
  • cassette Shimano Deore CS-M4100, 11-42T
  • chain KMC X10
  • front hub Shimano HB-TX506, QR, 6-Bolt
  • rear hub Shimano HB-TX506, QR, 6-Bolt
  • rims CUBE EX23, 32H, Disc, Tubeless Ready
  • tyres Schwalbe Smart Sam, K-Guard, 2.25
  • Stem CUBE Performance Stem SL, 31.8mm
  • handlebar CUBE Rise Trail Bar, 680mm
  • grips ACID React Pro
  • seat post CUBE Performance Post, 30.9mm
  • seatclamp CUBE Varioclose, 34.9mm
  • saddle Natural Fit Venec
  • headset ACROS AZX-1041, BlockLock 135°, 1 1/8" straight, Top Zero-Stack 1 1/8" (ZS 44mm), Bottom Zero-Stack 1 1/2" (ZS 56mm)
  • pedals CUBE PP MTB
  • weight 22,1 kg
  • colour teamline
  • Art. No 530070
  • Price

*Suggested retail price

Because of the problems in the delivery chain arising from the current COVID-19 situation, the bike can be delivered with modifications.

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  • INFO
  • 13.5" / 27.5 / XS
13.5" / 27.5 / XS
Seat Tube
Top Tube Horizontal
Seat Tube Angle
Head Tube Angle
Chain Stays
Head Tube
BB-Height to Hub
Standover Height

Find your size


NB: Measure without your shoes!

Cube Reaction Hybrid Rookie SL 400 teamline

Please be aware that information provided here regarding the correct frame size is a recommendation only. For the best results, please visit your local dealer for a personal consultation and test ride. Find your nearest CUBE dealer for a test ride in your size:

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This children's bike is a OneSize model suitable for kids up to the following maximum measurements:

Height: 136 - 147 cm
Inside leg: 63 - 70 cm

Please note this information is only a general recommendation. It cannot replace a personal consultation and test ride with a CUBE dealer.

Bike classification category: 3

Structural Weight:

80 kg

The combined weight of the rider and bicycle must not exceed the maximum system weight. Further details on the use of accessories, trailers or luggage racks can be found in the system weight table.

System weight table

The Reaction Hybrid Rookie takes all the race-inspired handling and performance of our adult Reaction bikes, and repackages it for keen junior riders. Powered by Bosch's third-generation Performance drive unit, there's plenty of juice to help your youngster keep up on longer family rides. Smooth-shifting, wide-ranging Shimano Deore 10-speed gears are easy to use, and they're backed by powerful Magura MT Thirty hydraulic disc brakes for safe stopping. There's a Suntour air suspension fork to help smooth the trail, and 2.25in tyres for grip and comfort. Just add a spirit of adventure, and go! 

Bike details

Suitable accessories