Alpha One

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: 14 inches
Approx. Age Range: 2½ to 4½ years
In Stock - Ships Free and Fast!

14-Inch Wheels | V-brakes & Coaster Brakes | Single Speed

Optional Freewheel Kit + $15:

CPSC standards require this bike to be shipped with a coaster brake installed. The optional kit allows the installation of a freewheel. The Freewheel Kit includes a complete wheel with a freewheel hub, and pre-installed tire and tube.

  • The 14" Alpha One is the smallest pedal bike in the Prevelo lineup and fits most 2.5 to 4.5 year olds. It's packed with features to get little riders off to the right start, including:
    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. Lightweight aluminum alloy fork with chromoly steerer.
    4. Tektro front and rear v-brakes with small reach brake levers.
    5. Rear coaster brake (removable with optional freewheel kit).
    6. Front hub with low profile rounded hex bolts and no harsh edged nuts for little legs to knock against.
    7. Three piece crank with squared taper bottom cartridge bearing bottom bracket and ultra narrow Q factor.
    8. Double chain wheel guard.
    9. Custom made cranks. All Prevelo cranks are sized specifically for each model bike, down to the millimeter.
    10. 95% assembled. Just install the handlebar, seatpost and pedals.
  • MEASUREMENT SPECIFICATION
    Weight (including pedals) 14.4 lbs / 6.5 kg (13.45 lbs / 6.1 kg with freewheel kit installed)
    Minimum Saddle Height 15.6 in / 397 mm
    Maximum Saddle Height 17.5 in / 445 mm
    Bottom Bracket Height 6.7 in / 170 mm

What the bicycle media is saying

From the tiny saddle to the custom 85mm-long cranks, everything on the Alpha One has been thought-through with the dedication and passion I normally see reserved for bikes costing thousands more.

- Red Kite Prayer

Components

COMPONENT SPECIFICATION
FRAME 6061 heat treated aluminum alloy custom formed tubing
FORK Aluminum alloy blades with chromoly steerer tube - 35mm rake
SEAT CLAMP Aluminum alloy with toolless adjustment
FRONT BRAKE Tektro aluminum V-brake
REAR BRAKE Tektro aluminum V-brake & coaster brake
FRONT BRAKE LEVER Tektro aluminum short reach
REAR BRAKE LEVER Tektro aluminum short reach
CRANK SET Prevelo anodized alloy 3-piece square taper with 85MM crank length.
SPROCKET 25T with double chain ring guard
BB SET Sealed cartridge
HEAD SET 1 1/8" threadless
RIM Aluminum with grinded sidewalls
FRONT HUB Lightweight alloy 1-piece forged CNC with low profile rounded hex bolts
REAR HUB Steel with integrated coaster brake - 14T cog
TIRE & TUBE Kenda Small Block Eight Pro 14 ×1.5
SADDLE Prevelo small kid saddle
HANDLEBAR Prevelo Aluminum - 470mm wide x 50mm rise - 22.2mm to 19mm taper
HANDLEBAR STEM Aluminum 30mm extension
GRIP Kraton rubber
PEDAL Composite with 9/16 chromoly axle

Geometry

MEASUREMENT SPECIFICATION
A Wheel Size 14"
B Wheelbase 26.3 in / 667 mm
C Effective Top Tube Length 13.7 in / 349 mm
D Head Angle 69°
E Seat Tube Angle 70°
F Chain Stay Length 10.7 in / 271 mm

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