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EXPLORE 4 20in Bike - Kids'
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Lightweight, geared, and trail-ready. The woom EXPLORE 4 is built for real kids
What Our Gearhead® Experts Are Saying:
"This is the bike you hand a kid when you want them to actually love riding. It's built like woom means it, light enough that a six-year-old can maneuver it confidently and spec'd so well it won't hold them back as they get faster and bolder."
woom has been engineering kids' bikes from the ground up since 2013, not shrinking adult designs, but building from a child's actual proportions and strength. The EXPLORE 4 is that philosophy made real: hydraulic disc brakes that stop reliably without a white-knuckle squeeze, a Shimano 7-speed drivetrain kids can shift intuitively, and Schwalbe all-terrain tires that handle pavement, gravel, and dirt trails with equal confidence. The adjustable stem and ABC fit guide take the guesswork out of sizing as your rider grows.
Heads up - We do our best to keep bike specs and images current, but occasional component changes can happen without warning-and sometimes the photos might not show the exact build you'll receive. If you want to double-check the details, our Gearheads are always here to help.
Details
- Hydraulic disc brakes stop safely without a strong squeeze
- Shimano 7-speed lets kids shift up and back intuitively
- Schwalbe Billy Bonkers tires grip pavement, gravel, and dirt
- Adjustable stem grows with the rider, no new bike needed yet
- Child-specific crank length protects knees on every pedal stroke
- Ergonomic grips reduce hand fatigue on long rides
- LEGGIE kickstand included, easy to park and go
- woom's 10-year frame warranty backs every ride ahead
- Item #WOO0006
- Frame Material
- AA 6061 aluminum
- Suspension
- hardtail
- Fork
- aluminum
- Headset
- integrated 1in
- Shifters
- Shimano SL RV300 Revoshift
- Rear Derailleur
- Shimano
- Crankset
- forged aluminum
- Chainring Sizes
- 28t
- Crank Arm Length
- 110mm
- Cassette Range
- 11 - 28t
- Brakeset
- hydraulic disc
- Brake Type
- hydraulic disc
- Rotors
- 140mm
- Handlebar
- aluminum riser
- Handlebar Width
- 550mm
- Stem
- aluminum (adjustable)
- Saddle
- ergonomic (developed with Selle Royal)
- Seatpost
- aluminum
- Wheelset
- aluminum
- Front Axle
- quick release
- Rear Axle
- bolt-on
- Tires
- Schwalbe Billy Bonkers Performance Line
- Tire Size
- 20 x 1.5in
- Pedals
- platform
- Extras
- LEGGIE kickstand
- Claimed Weight
- 18lb (8.16kg)
- Activity
- trail
- Manufacturer Warranty
- [registered] 10 years
Explore On Any Terrain
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Built For Confident Riding
Disc Brakes
Powerful disc brakes with adjustable levers provide strong, reliable stopping in all conditions with less hand effort
Twist Shifting
A twist shifter lets kids change gears easily with a simple motion for smooth, controlled riding
All-Terrain Tires
Grippy tires with fast-rolling tread provide traction on pavement and dirt without slowing riders down
Child-Specific Frame
Kid-specific geometry with a slightly extended riding position improves comfort, stability, and control on longer rides
Dialed Fit System
ABC markings on the stem and seatpost make it easy to adjust and maintain the correct fit as kids grow
Find The Right Size
6–8 years
20" wheels
7–11 years
24" wheels
10–14 years
26" wheels
Geometry & Size Chart
Complete Your Setup
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READY Helmet - Kids'
5 colors
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VIENNA Bike Bell - Kids'
1 color
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POP Bike Basket - Kids'
4 colors
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LOKKI Bike Lock - Kids'
1 color
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PICKUP Rack
1 color
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POP Ons Bike Basket Charms
1 color
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LEGGIE Kickstand
1 color
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WARM TENS Bike Glove - Kids'
1 color
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SURFBOARD Footrest
1 color
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SNAP Click-On Fender
1 color
+2
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TENS Bike Glove - Kids'
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BING Bike Bell - Kids'
1 color
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BUTLER Bike Bag - Kids'
1 color
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GLUG Stainless Steel Bike Bottle - Kids'
1 color
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AMIKO Active Bag - Kids'
1 color
Made To Grow With Every Ride
woom started in a Vienna garage when two bike‑obsessed dads reimagined kids’ bikes from the ground up, engineering superlight, child‑specific designs that turned first wobbles into real, joyful riding. Today their award‑winning lineup evolves with kids, moving from tiny first bikes to more advanced models that keep pace as skills, confidence, and ride ambitions grow.