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Slovak
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Weight 8.35 kg
Height 105 - 135 cm
Different size? See all models
12"
Foxie 12 3,0 kg • 90 - 100 cm In stock
12"
Foxie 12+ 3,1 kg • 90 - 100 cm In stock
14"
Foxie 14 5,6 kg • 95 - 115 cm In stock
16"
Foxie 16 5,9 kg • 100 - 125 cm In stock
18"
Foxie 18 6,4 kg • 105 - 130 cm In stock
20"
BikeUP 20 8.35 kg • 105 - 135 cm In stock
24"
BikeUP 24 9.6 kg • 125 - 145 cm In stock
Subscription type
More than 10 in stock
Currently making over 400 kids happy

Bike description

BikeUP 20 is a lightweight aluminium bike for children who want to ride farther, faster and handle hills with confidence. Thanks to its 20" wheels, reliable V-brakes and 7-speed Microshift Gripshift derailleur, chosen for BikeUP 20 to make shifting easier and more natural, it is ready for cycle paths, family trips and everyday adventures.

When your child outgrows it, you can swap it for a 24-inch BikeUP 24 bike.

Technical specifications

Wheel size 20"
Weight 8.35 kg
Height 105 - 135 cm
Min. saddle height 560 mm
Age 5-7 years

Color

  • Metallic orange

Frame

  • Lightweight AA 6061 aluminium alloy frame
  • Geometry tailored to 20" wheels
  • Lowered top tube makes getting on and off easier

Handlebar and stem

  • Anodised aluminium handlebar in matte black
  • Handlebar width 540 mm, bar end diameter 22.2 mm, rise 30 mm
  • 40 mm aluminium stem

Fork

  • Anodised aluminium fork in matte black
  • Ready for mudguard mounting

Saddle and seatpost

  • Saddle height from the ground: 560–725 mm
  • Seatpost with a marked minimum insertion line
  • Quick-release clamp for tool-free saddle height adjustment

Brakes

  • Front and rear disc brakes for reliable braking even in the wet

Tyres and wheels

  • Size 20"x1.75"
  • Schrader valves for easy inflation with a regular bike pump
  • Aluminium hubs with sealed bearings
  • Quick-release axles let you remove and fit the wheels without tools

Gears and drivetrain

  • Grip Shift twist shifter changes 7 gears with a turn of the grip
  • Clear gear indicator
  • Single narrow-wide chainring up front for simple operation without a front derailleur

Geometry

The measurements that tell you whether the bike fits your child — and how long it will last them.

ABCDEFGHIJ

Bike measurements

A Wheel size 20"
B Handlebar/grip height 750 mm
C Head tube angle 71°
D Seat tube angle 72°
E Reach 330 mm
F Wheelbase 830 mm
G Minimum saddle height 560 mm
H Maximum saddle height 725 mm
I Crank arm length 127 mm
J Standover height 510 mm

How to tell whether the bike fits

1 If they can't ride yet

The minimum saddle height decides. Seated on the lowest saddle position, the child must reach the ground with both feet flat. Its inseam must therefore be at least the minimum saddle height.

2 If they already ride

The stand-over height decides. Standing over the frame in front of the saddle, both feet must be flat on the ground with at least 2 cm to spare. It no longer needs to reach the ground from the saddle — the saddle goes higher so the leg is almost straight.

— If the size doesn't fit, we swap it free within 7 days — you only pay the courier.

How to measure the inseam

The one number you need. You compare it with the bike's measurements.

How to measure the inseam
inseam
  1. 1

    Stand the child with its back to a wall, in the shoes it will ride in, feet together.

  2. 2

    Put a book, spine up, between its legs and press gently — as if it were sitting on the saddle.

  3. 3

    Measure from the top of the book to the floor. That is the inseam.

Compare it with the bike's measurements

If the child is still learning, the inseam must be at least the minimum saddle height — so it reaches the ground flat-footed from the saddle. If it already rides, it only needs to be at least 2 cm more than the stand-over height.

If the size doesn't fit, we swap it free within 7 days — you only pay the courier.

Reviews

4.9 16 reviews
Only customers who actually had the bike can leave a review.
Lenka
29.09.2026

Both of our kids used BikeUp, and it was absolutely fantastic. When it was time to upgrade to a bigger bike, the exchange went off without a hitch. The bikes are great.

Obě naše děti využívali bikeup a naprostá paráda. Když bylo čas na větší kolo , výměna proběhla jako po másle . Kola jsou skvělá .

Michaela
25.08.2026
Gabriela
11.08.2026
Show all 16 reviews →
BikeUP 20 from €15.89 / monthly
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