ADULT BIKES

Pre-Order Dates

We do not open pre-orders for a shipment until we have a good amount of confidence in the ship date.  That being said, the estimated delivery dates listed on our website are based on the best information that we have at the moment.  While we cannot control every variable, we pledge to be honest and transparent about lead times.

- The ship dates that are on the website represent our honest estimate of the date that the bikes will ship on.

- Where information is imprecise (for example, referencing a month or quarter), it is because there are unpredictable factors that make it so we cannot credibly be more precise.

- We will work tirelessly to keep the bikes on schedule. It's part of our company culture to be very involved in our supply chain and to be proactive about addressing issues that could turn into delays.

- If something happens that changes the ship date we will communicate quickly and clearly about the delay.

- You can cancel your pre-order any time before your bike ships.


Pre-date changes

Your pre-order date will be included in your order confirmation. If we learn something that changes that date, we will contact you. You might see the pre-order date change on the website. There are a variety of things that could cause a change in the pre-order date including shipping delays, back logs, or moving through different batches. Just because the date on the website changes, does not mean that the date of a pre-order already placed has changed.  Again, if you place a pre-order and the estimated delivery date changes, we will inform you.


Pre-order payment policy

Your credit card will be charged immediately when you place your pre-order.  Your pre-order is cancelable and fully refundable. If you need to cancel a pre-order contact us and we'll take care of it!

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  • "Top Pick" by Two Wheeling Tots

  • NY Product Design Awards | 2026 Gold Winner

Alpha Four MkIII

170 reviews
$799.00
Color: Speed Silver
Size
Guide Assembly
Options Assembly
Instructions

At a glance

Use
Streets, paths and light trails
Wheel Size
24 in
Age
7 to 11 years
Type
All-purpose Bike
Weight
19.2 lbs(without pedals)
Inseam
23" to 28"

The Prevelo Alpha Four is a 24-inch kids' bike and the step up from the 20-inch Alpha Three, crafted for confident riders ages 7 to 11. At 19.2 pounds it blends trail-ready capability with youth-friendly ergonomics: an 8-speed Microshift Acolyte geared drivetrain with chain retention and hydraulic disc brakes. A Two Wheeling Tots Top Pick, it's equally at home on pavement, bike paths, and light singletrack. Fits inseams 23 to 28 inches.

The Most Advanced 24" All-purpose Bike

Packed with mega smart features

Prevelo Bikes - Alpha Four - Speed Silver
Components
FrameLightweight Triple Butted 6061 Aluminum. Low Center of Gravity, Kid Specific Geometry. Internally routed Cables. 3D Forged Dropouts. Dropper Post Compatible.
ForkBladed Aluminum Legs with 1 1/8" Aluminum Steer tube
Seat ClampAluminum Quick Release
BrakesPromax Hydraulic Disc Brakes
DerailleurMicroshift Acolyte Super Short with Springlock chain retention system
Shifter8 speed Microshift Acolyte Quick Trigger w/ Indicator
Freewheel / Cassette8 speed 11-38t Microshift H083
CrankHEIR Lightweight Aluminum 3 piece. Narrow Width, 130mm length
Chainring28T Narrow Wide with aluminum chain ring guard
Bottom Bracket68x113 Hollow Square Taper with Sealed Cartridge Bearings
Headset1⅛" Integrated Threadless Sealed Cartridge
RimsDoublewall Aluminum, tubeless compatible
Front Hub28h Aluminum Sealed Cartridge with Quick Release Skewer
Rear Hub28h Aluminum Sealed Cartridge with Hex Key Skewer
TiresKenda Small Block Eight 24x1.95 Folding Bead 60 TPI
SaddlePrevelo 1pc Junior
Seat Post⌀31.6mm alloy 1 piece
HandlebarHEIR Riser Lightweight Aluminum 31.8 clamp, 19mm grip 580mm wide, 25mm rise
StemLightweight Aluminum 31.8, 35mm Extension
Grips110mm Black Rubber 19mm diameter Lock-On
PedalsComposite Big Kid, 9/16 LONG Crmo Spindle
VersionMK III
Measurements
Weight19.2 lbs
Recommended Inseam23" to 28"
Minimum Saddle Height26.1 in / 665mm
Maximum Saddle Height31.5 in / 800mm
Gain Ratio1.79 - 6.18
Max Tire Width2.2 in
Geometry
Wheel Diameter24 in
Wheelbase38.38 in / 975 mm
Chain Stay Length15.94in / 405 mm
Head Angle68°
Seat Tube Angle73°
Seat Tube Length12.59 in / 320 mm
Effective Top Tube19.88 in / 505 mm
Bottom Bracket Height9.9 in / 252 mm
Bottom Bracket Drop1.7 in / 43 mm
Stack18.7 in / 475 mm
Standover20.07 in / 510 mm
Q Factor146mm
Reach14.13 in / 359 mm
Shipping Weights & Dimensions
Box Dimensions51.0 in x 8.3 in x 26.9 in
Shipping Weight27.8 lb

Specifications and components are subject to variations and change without notice.

Promax Hydraulic Disc Brakes

Promax hydraulic disc brakes provide young riders with smooth, consistent, and reliable stopping power. Whether navigating steep descents or threading through technical trails, these brakes offer excellent modulation and control, helping kids ride with greater confidence and composure. Designed to perform in a wide range of conditions, they inspire trust in both riders and parents by delivering powerful braking performance when it matters most.

Hill Conquering Gear Range

The Microshift Acolyte Super Short Derailleur allows the Alpha Series bikes to use an 11-38t cassette. This gives 90% more gear range than other comparable bikes. The clutched cage helps keep the chain from dropping over even the roughest terrain. 

Tubeless Capable Double Wall Rims

Durable double wall rims provide a strong, stable platform for young riders tackling rough terrain. Tubeless-ready design allows for lower tire pressures, better traction, and fewer flats—ideal for confident riding on trails and beyond.

Confidence Inspiring Geometry

Low standover allowing young riders to get on a bigger wheel earlier. Bigger wheels roll faster, offer more traction, and roll over obstacles with less effort. Upright seating position with just enough weight over the front of the bike to maintain control and balance. A low center of gravity that's designed to keep the riders weight "in" the bike, rather than on top. Short chainstays keep the bike agile, while a slack front end keeps things stable at all speeds. 

Protected Flat Mount Rear Caliper

The flat mount rear brake caliper is positioned snugly between the seat stay and chain stay, shielding it from trail hazards and accidental bumps. This low-profile placement keeps the caliper protected without compromising performance, delivering reliable braking while preserving the clean lines of the frame.

Kid Sized Control Center

Short stems, handlebars sized to match shoulder width, easy-to-reach brakes, and a kid-friendly shifter. All features that give the rider control of their steed. 

Kid Friendly Shifting

Microshift builds some of the most thoughtfully engineered shifters for young riders. With compact, easy-to-reach triggers and exceptionally light actuation, this system is designed specifically with smaller hands in mind. The result is a smooth, intuitive shifting experience that empowers kids to ride with confidence and control. By prioritizing ergonomics and usability for youth riders, Microshift delivers a drivetrain interface that feels natural from the very first ride—no awkward reaches, no excessive force, just seamless gear changes tailored to growing cyclists.

Rider Supply Pod Ready

The Alpha Four features built-in top tube mounting points for securely attaching the Rider Supply Pod. This convenient location keeps essentials like snacks or tools within easy reach for young riders. The mounts provide a clean, strap-free setup that keeps the bag stable and out of the way. Installation requires standard hex bolts for a solid, rattle-free fit. It's a thoughtful detail designed for real-world adventures.

A glimpse of the future.

What the Press Says about the Alpha Four

Exceptional - 5 Stars

The perfect mix of road warrior and basic all-terrain cruiser, the Alpha Four is built with kid-specific geometry for a precise, comfortable fit.....The Prevelo Alpha series is an exceptional line of bikes for eager young riders. Lightweight with a low-center-of-gravity, the Alphas are fun and easy to ride.

Two Wheeling Tots

The Alpha Series from Prevelo are neighborhood bikes that punch above their intended use. The geometry lends itself to ripping up trails as much as it does flying around the cul-de-sac. Everything is spot on from the tires, to the brakes to the handlebars.

The Bike Dads

9.8

Prevelo Alpha is a masterclass in kids' biking, offers a lightweight, durable design with thoughtful features, making it an ideal choice for young riders taking their first pedal strokes.

Cyclist Authority

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Common questions

How can I teach my child how to shift?

Reach our article on Teaching Children to Shift Gears

How do I adjust my derailleur?

See our derailleur adjustment video here: Derailleur Adjustment

How do I adjust reach on Promax Hydraulic Disc Brake Levers

See the article here: Adjusting Reach on Promax Hydraulic Brake Levers

How much assembly is required?

Prevelo bikes come almost fully assembled. Here are the complete assembly requirements for each bike:


BikeAssembly steps
Alpha Zero(1) attach handlebar to steerer tube, (2) adjust seat height
Alpha One and Alpha Two(1) attach handlebar to steerer tube, (2) attach pedals, (3) adjust seat height
Zulu One(1) attach handlebar to stem, (2) attach pedals, (3) adjust seat height
Alpha Three(1) attach handlebar to steerer tube, (2) attach front wheel, (3) attach pedals, (4) adjust seat height
Zulu Two, Alpha Four, Alpha Five, Zulu Three, Zulu Four, Zulu Five(1) attach handlebar to stem, (2) attach front wheel, (3) attach pedals, (4) adjust seat height


You can view assembly instructions for all bikes here: Assembly Instructions

How quickly do bikes ship?

Each bike's product page shows its expected ship date. In-stock bikes ship promptly from our warehouse, and if a bike is on pre-order, the product page shows the pre-order ship date as well. At checkout you can choose flat-rate ground shipping or expedited 2-day or 1-day express delivery (for Contiguous US).

Full details: Shipping Terms.

Which size bike fits my rider?

Sizing is based primarily on your child's inseam (inner-leg measurement), which is more reliable than age. When a rider falls between two sizes, the smaller wheel is easier to handle and the larger gives more room to grow.

Recommended inseam ranges differ by model, and we keep them current per bike, so use the Bike Chooser for an exact, up-to-date recommendation matched to your child's inseam.

See the Bike Chooser.

What is Prevelo Bikes' return policy?

All Prevelo bikes come with a 30 day Money Back Guarantee. Try it out the bike on a dry surface and if for any reason you don't love it, you can return it to us within 30 days.

Just make sure to hold onto the original packaging until you know it's right.

To learn more about the 30 Day Money Back Guarantee or to return an item, go here: Returns

What is Prevelo Bikes' Warranty?

Every Prevelo comes with the Prevelo Bikes Five Year Limited Warranty. The frame and rigid fork are warranted against defects in material or workmanship for five years from the original date of purchase, to the original owner. Paint finish and all other original components are warranted for one year. Normal wear, and damage from crashes, misuse, neglect, or improper assembly, are not covered.

See the full terms: Prevelo Bikes Five Year Limited Warranty.

More in our Knowledge Base
Prevelo Bikes - Alpha Four - Speed Silver

Alpha Four

$799.00

The Prevelo Alpha Four is a 24-inch kids' bike and the step up from the 20-inch Alpha Three, crafted for confident riders ages 7 to 11. At 19.2 pounds it blends trail-ready capability with youth-friendly ergonomics: an 8-speed Microshift Acolyte geared drivetrain with chain retention and hydraulic disc brakes. A Two Wheeling Tots Top Pick, it's equally at home on pavement, bike paths, and light singletrack. Fits inseams 23 to 28 inches.

Color

  • Speed Silver
  • Braap Blue
  • Party Pink

Wheel Size

24 in

Type

All-purpose Bike

Use

Paved, dirt paths

Speeds

8

Weight

19.2 lbs

Min Saddle Height

26.1 in / 665mm

Max Saddle Height

31.5 in / 800mm

Wheelbase

38.38 in / 975 mm

Tires

Kenda Small Block Eight 24x1.95 Folding Bead 60 TPI

Saddle

Prevelo 1pc Junior

Derailleur

Microshift Acolyte Super Short with Springlock chain retention system

Cassette

8 speed 11-38t Microshift H083

Crank

HEIR Lightweight Aluminum 3 piece. Narrow Width, 130mm length

Brakes

Promax Hydraulic Disc Brakes
View product