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WOOM WOOM4 Yellow 20 Pedal Bike The WOOM4 Yellow 20 Pedal Bike is the best all-around 20" bike for your all-terrain rider. It's rugged, sturdy and highly responsive for moderate single-track riding and comfortable enough for urban street riding. Category: Pedal Bike Brand: Pedal Bike Product #: WM4-YE 4.9 stars, based on 59 reviews Regular price: $465.99 $449.00 Available from: Condition: Brand New - Excellent Condition Out of Stock!

WOOM4 Yellow 20 Pedal Bike

Item No.: WM4-YE Brand: WOOM Category: Pedal Bike Rate It: WHAT CUSTOMERS ARE SAYING

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For Today! $449.00 $465.99 MSRP Save $16.99
FREE SHIPPING on all orders over $60. Guaranteed - Shop with Confidence! OUT-OF-STOCKGet Notified by Email


The Perfect All-Terrain Bike

The WOOM4 Yellow 20 Pedal Bike is the best all-around 20" bike for your all-terrain rider. It's rugged, sturdy and highly responsive for moderate single-track riding and comfortable enough for urban street riding. The WOOM4, with its optimized geometry design build, is more than ready for any terrain your rider can throw at it. With 8 gears and light off road tires it is perfect for exploring and an extended usage.

In addition to its unique low center-of-gravity design, the WOOM4’s frame is made of a light and high quality 6061 aluminum tube, comes with 20" KENDRA wheels, super light Soopa-Doopa-Hoops aluminum rims, and front and rear V-brakes (no foot/coaster brake). This bike represents the ideal pedal bike and enables fast learning of the movement process - without the need for training wheels.

WOOM Bikes are perfectly prepared and almost completely assembled when shipped. Only a few small adjustments are necessary to get the bike ready to ride. Assembly instructions and required tools are included.

  • Install the front wheel
  • Attach the head set and tighten the 6mm bolt firmly using the allen wrench
  • Adjust brake
  • Install Pedals
  • Adjust saddle height and ready to go
  • Blown away... This thing is light, well built, with good brakes. But most importantly, great geometry.

  • Great first two-wheeler!!! My son was ready to transition from a balance bike, and after researching the options the WOOM was the clear choice for him.

+ Popular WOOM Accessories

WOOM Cycling Cap
Cycling Cap

Protect and shield their noggin from the elements

WOOM Cycling Cap
Cycling Gloves

Look cool and fashionable with improved overall hand grip.



Key Features & Highlights

  • Top Pick with "Exceptional Rating" from TwoWheelingTots
  • Ideal for kids ages, 6-9 years old.
  • Light weight 6061 aluminum frame
  • 8- Speed Shimano twister shifter (trigger shifter available at no charge)
  • Kickstand already installed
  • Geometry designed with the rider in mind
  • High quality and light weight components: bike weighs only 17lb 8oz
  • Two V-hand reach brakes (front and rear)
  • Tested and certified to be compliant with the strict new federal regulations of the Consumer Product Safety Improvement Act.
  • Certified compliant with California Proposition 65 lead standards.
  • Assembly is a breeze.
  • Guaranteed Warranty from defects in material and workmanship.
  • Free shipping on all WOOM bikes.


WOOM4 Geometry

Wheel / Tire size 20 in Wheelbase 825 mm
Cockpit / Grip height 745 mm Crank length 110 mm
Steering angle 68° Seattube angle 71.5°
Medium standing height 550 mm Minimum Seat Height 19.6 in
Horizontal toptube length 430 mm Maximum Seat Height 27.5 in

WOOM4 Specifications

Frame Material: Light and high quality A-6061 Aluminum - 20" wheel size providing agile yet good natured riding characteristics: low step in height, very low minimum seating position, long wheelbase, very forgiving geometry Set up provides maximum stability, and excellent balance resulting in increased satisfaction - Continuous seat post design allows for maximum saddle height adjustment
light unicrown fork made out of Chro-Moly steel - 1" shaft - designed for ease of steering
semi-integrated 1" headset = sealed ahead set made out of steal and aluminum - integrated ahead clamp
Forged Aluminum - 40mm - +10° - no protruding screws in this fully integrated and proprietary clamp design - we call it the knee-friendly design - the handlebar is connected with two 6mm bolts
wide, ergonomic, and light aluminum handlebar for more control - BMX style with high rise for maximum adjustability - sand blasted and black anodized - Width: 520mm
reduced diameter for extra small hands - free of softeners and pollutants - grippy diamond structure - handle bar ends contain rubber plugs for additional cushioning and safety
Two independent hand brakes (No Coaster Brake) - Mini V-Brake with levers suitable for small hands - brake lever with reach adjustability and ergonomic fit for very small hands - high quality Jagwire bowden cable for low friction and ease of operation
Light forged aluminum cranks with 110mm length and low Q-Factor (low width between both legs) - Beginner ratio: 32T front and 11-32 rear - plastic pedals - molded cartridge chamber - Easy to operate V Hand brakes
1x8 gears - Microshift twister shifter for ease of shifting - Microshift RD-M45S Shifter with short cage
Super light Soopa-Doopa-Hoops Aluminum rims - small Aluminum hubs for extended leg room at the rear wheel - sealed bearing hubs - wheel can be installed and removed with 5mm allen wrench - 20 Niro spokes 1.8 straight spokes
Kenda Small Block 1,5"x20 light weight low profile balloon tires offer great damping, rolling performance and a lot of grip - Schrader valves (car valves) to inflate easily
Age specific and ergonomically designed and molded - Free of pollutant and toxins - side safeguard to lean against wall
Seat post
Anodized aluminum seat post - integrated maximum insertion indicator
Seat post clamp
Aluminum quick release seat clamp with long lever for ease of use and operation - clamp is safely secured against unnecessary movements
Enclosed tools
1x6mm long allen wrench for headset, 15 wrench for pedals
17lb 8oz (7.9kg)
red, blue, green, honey yellow, pink, purple
Shipping dimensions
42" x 9" x 23"


We Make Shipping Easy

Estimated Arrival: Between Wed, 6/28 and Fri, 6/30 (Before 11am EST on 6/24).
*Estimated shipping is based upon our average delivery time. Estimate shipping does not apply to pre-order items.

Free shipping available on all bikes and orders over $60 within the U.S. contiguous 48 states. We do not ship to Alaska and Hawaii.

Most orders will normally ship within 1-2 business days (M-F). We understands that getting your items promptly is important to you, so we make every effort to process your order quickly.

A shipping confirmation will be emailed to you once your order ships. It will include all of your shipping and tracking information. To ensure email delivery, be sure to add our email address,, to your contact list.

At anytime you can track the process of your order. Click on link "My Order" located on the upper right corner of each page. Enter your Order Transaction Number and the email address used during the checkout process.

NOTE: We cannot ship to the following: Hawaii, Alaska, P.O. boxes, APO and FPO, outside of the U.S. contiguous 48 states and/or Internationally. We have a single flat $10 shipping rate on orders $60 and below. Shipping Policy | Returns Policy


The JumpStartBikes Guarantee:

Thank you for giving us the opportunity to earn your business. We take pride in the amount of time we expend helping customers make the best possible buying decision. We will work hard to keep your business and do everything in our power to make sure you get the best service available.

  • To provide the Lowest Prices.
  • Always FREE SHIPPING on bikes and orders over $60.
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  • Responsive White-Glove Customer Service. Email us at with any questions, we'll get right back to you.

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That's right, we offer free shipping on all balance bikes within the U.S. contiguous 48 states. We understands that getting your items quickly is important to you, so we make every effort to process your order quickly. Read more »

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