Zulu Three

Size Guide
Sizing

Prevelo Bike Sizing

Getting your kids the right size bike is important and, fortunately, also easy. You just need two pieces of information about your little rider:

  • Inseam
  • Rider Experience

Measuring Inseam

  1. Have the rider stand against a wall, hold a book between their legs so that it is firmly against their crotch (the same place their bicycle seat will be).
  2. Measure the distance from the floor to the top of the book.

Rider Experience

Children who are learning are more sensitive to bicycle height than children who already know how to ride a bike. For this reason, our recommendations for bicycle sizing vary slightly based on the experience lever of the rider. The chart below takes into account the fact that experienced riders tend to adapt better to a bike that is slightly larger. For this purpose we categorize young riders as either "Learners" or "Pedalers"

  • Learner: riders who either have not yet learned to ride a pedal bike, or are still frequently putting their feet on the ground while riding.
  • Pedaler: riders who can ride confidently and only put their feet down to stop.
Model Wheel
Size
Approx. Rider Age
(years)
Learner Inseam
(inches)
Pedaler Inseam
(inches)
Alpha Zero 12" 1½ + 9.5 to 13.5
Alpha One 14" 2½ to 4½ 12.5 to 16 12.5 to 16
Alpha Two 16" 3½ to 6 16 to 18 with short seat post
(21.5 to 24 with long seat post)
15 to 17.5 with short seat post
(20.5 to 23.5 with long seat post)
Alpha Three 20" 5 to 9 18 to 23 17.5 to 22.5
Alpha Four 24" 7 to 11 24 to 29 23 to 28
Zulu Three 20" 5½ to 9 21 to 26 20 to 25
Zulu Four 24" 8 to 11 24 to 29 23 to 29

Wheel Size: 20 inches
Approx. Age Range: 5½ to 9 years
In Stock - Ships Free and Fast!

20-Inch Wheels | Hydraulic Disc Brakes | 10-Speed | Air Fork

  • The Prevelo Zulu Three packs high performance mountain bike features into a package for small riders. Every component is the real deal and is carefully chosen to provide the best performance and fit for young riders ready to tear up the trails. It features:
    1. Prevelo confidence inspiring low and narrow geometry. Prevelo geometry keeps the rider low, balanced and in control.
    2. Lightweight 6061 aluminum frame with custom formed tubing.
    3. Air fork with lockout. This is a real air fork. Lightweight. Adjustable. Effective at soaking up harsh terrain.
    4. Hydraulic disc brakes with special short reach levers for little hands.
    5. Quick release front and rear wheels for toolless wheel removal.
    6. Three piece crank with squared taper bottom cartridge bearing bottom bracket and ultra narrow Q factor.
    7. Custom made cranks. All Prevelo cranks are sized specifically for each model bike, down to the millimeter.
    8. Shimano ZEE 10-speed drivetrain. This 10-speed derailleur has a SHIMANO Shadow RD+ Short cage. Because kids’ bikes have small wheel diameters, rear derailleurs on kids’ bikes hang low and close to the ground. The Prevelo Zulu bikes use high performance short cage derailleurs to keep things high and away from the ground. The derailleur also features a clutch that can be turned on with the flip of a switch to eliminate derailleur bounce over hard terrain and reduce chain drops.
    9. Shimano SLX RAPIDFIRE Plus Shift Lever. Reliable silky smooth shifting and easy for small hands to operate.
    10. Replaceable derailleur hanger. If the derailleur takes a hard hit, the hanger can be replaced without repair to the frame.
    11. 11-34T wide span gearing gives riders plenty of range to spin up tough hills.
    12. 95% assembled. Just install the handlebar, seatpost, front wheel and pedals.
  • MEASUREMENT SPECIFICATION
    Weight (including pedals) 23.4 lbs / 10.6 kg
    Minimum Saddle Height 22.8 in / 580 mm
    Maximum Saddle Height 28.0 in / 712 mm
    Bottom Bracket Height 9.8 in / 248 mm
  • Trying to decide between the Alpha Three and the Zulu Three? Click here to learn the difference:   Alpha Series vs. Zulu Series

Components

COMPONENT SPECIFICATION
FRAME 6061 heat treated aluminum alloy custom formed tubing
FORK Spinner 300 AIR 20” with adjustable air pressure and lockout
SEAT CLAMP Aluminum alloy with toolless adjustment
FRONT BRAKE Promax hydraulic with 160mm rotor
REAR BRAKE Promax hydraulic with 160mm rotor
FRONT BRAKE LEVER Promax short reach hydraulic
REAR BRAKE LEVER Promax short reach hydraulic
REAR DERAILLEUR Shimano ZEE Shadow RD+ 10-speed with ON/OFF Clutch
SHIFTER REAR Shimano SLX RAPIDFIRE Plus
FREEWHEEL/CASSETTE Shimano 11-34T
CRANK SET Prevelo anodized alloy 3-piece square taper with 120MM crank length.
SPROCKET 32T narrow wide with alloy chainring guard
BB SET Sealed cartridge
HEAD SET 1 1/8" threadless
RIM Aluminum doublewall
FRONT HUB Lightweight alloy 1-piece forged CNC with quick release
REAR HUB Lightweight alloy 1-piece forged CNC with quick release
TIRE & TUBE Kenda Small Block Eight Pro 20 × 2.1
SADDLE Prevelo big kid saddle
HANDLEBAR Prevelo aluminum big bore - 560mm width x 40mm rise with 31.8mm to 22mm taper
HANDLEBAR STEM Aluminum 60mm extension
GRIP Kraton rubber
PEDAL Alloy pedal with 9/16 chromoly axle and bearings

Geometry


MEASUREMENT SPECIFICATION
A Wheel Size 20"
B Wheelbase 32.6 in / 827 mm
C Effective Top Tube Length 17.5 in / 445 mm
D Head Angle 68°
E Seat Tube Angle 67.5°
F Chain Stay Length 13.5 in / 342 mm

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