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2026 Centurion

R' Bock 20

A 20″ aluminum frame general youth bike with mid-range components and tektro hydraulic disc brakes.
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Weight19.4 lbs  
FrameAluminum
SuspensionRigid
Wheels20″ Aluminum
Drivetrain1 × 7
GroupsetTourney
BrakesTektro Hydraulic Disc
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Insights
Gearing

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

Lowest gear

(climbing)

15 mph

R' Bock 20

18 mph

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Highest gear

(descending)

Geometry
Specs
Build
Frame

R' Bock 20 II, Material: Aluminium, 20", Steuerrohr: 1 1/8" straight, Ausfallende: 10x135mm, Bremsaufnahme: IS-mount

Fork

CENTURION Kids rigid 20", 1 1/8" straight

Bottom Bracket

FSA TH-7420ST

Stem

PROCRAFT Kids, Winkel: 0°, Länge: 50mm

Handlebar

PROCRAFT Kids Pro, Durchmesser: 25.4mm, Breite: 500mm

Saddle

PROCRAFT Kiddy

Seatpost

PROCRAFT Race, Durchmesser: 27.2mm, Länge: 300mm

Type: Rigid

Pedals

VP VP-225

Groupset
Rear Derailleur

SHIMANO Tourney TX, RD-TX800, 1x7

Crank

PROCRAFT Kids Comp 28T incl. BG, Länge: 115mm

Shifters

SHIMANO Tourney TX, RD-TX800, 1x7

Cassette

SUNRACE CSM40, 11-34T

Chain

KMC Z7 gray/brown

Brakes

TEKTRO Junior, HD-J285, organic pad

Type: Tektro Hydraulic Disc

Brake Levers

TEKTRO Junior, HD-J285

Wheels
Rims

PROCRAFT MPD19, IW 19mm

Spokes

PROCRAFT stainless 2.0/1.8

Front Hub

PROCRAFT 6-Bolt QR, 9x100, 24H, 10x135mm, 28H

Rear Hub

PROCRAFT 6-Bolt QR, 9x100, 24H, 10x135mm, 28H

Tires

KENDA Booster 20x2.20", fold

Accessories
Bell

PROCRAFT Megaping

Rider Notes
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First added March 21

Last updated May 30