Frog 43 Kids Bike
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Frog 43 Kids BikeFrog 43 Kids Bike
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Code: FROG-40
Frog 40 Kids Bike For 3-4 years

The first pedal lightweight Frog 40 is best suited to children aged 3-4 years old with an average inside leg measurement of 40cm. This bike is a great confidence booster and can be used as a balance bike for taller child by removing the pedals. With Child freindly components such as easy reach brake levers for smaller hands and shorterned cranks to make those first pedals easyier. 

  • Frame: Aluminium (7")
  • Fork: Aluminium
  • Wheel Size: 14"
  • Tyres: Kenda 14"x1.75"
  • Chainset: Frog Bikes Patented 89mm - 32T
  • Speed: Single Speed
  • Pedals: Plastic Platform
  • Saddle: Frog Bikes
  • Handlebars: Frog Bikes
  • Stem: Frog Bikes
  • Brake calipers: Tektro Easy Reach
Supplied With:
  • Bell
  • Reflectors
  • Weight: 6.46kg
Please Note: All of our bikes are built to order and our current build time is approximately 7 working days.

How to choose a Child's Bike

In contrast to many children's bikes, Frog bikes are sized by the length rather than age, as this is the most reliable way of getting the right size of bike for each child. Age alone isn't a reliable measure as there is a large spread of "normal" leg lengths & heights for age.

Please take the time to measure the rider's inside leg. It's easy to measure:

  1. Stand the child in socks against wall
  2. Place a small book between their legs, as high as is comfortable
  3. Ask the child to move away and measure from the top of the book to the floor

Once you have measured the inside leg, use this table to find the right size bike for your child. Note we give the MINIMUM inside leg length for each bike, with the saddle at it's lowest setting. At this height, the child will safely be able to get their feet to the ground. Don't worry - Frog Bikes have long seat posts, so the saddle can be raised a long way as the rider grows.

 BikeMinimum inside
leg (cm)
Approx ageWheel SizeFrame Size
Frog 43433-414″9″
Frog 48484-516″9.5″
Frog 52525-620″10″
Frog 55556-720″11″
Frog 62628-1024″12″
Frog 696910-1226″14″
Frog 737312-1426″16″
Frog Road 58586-720″11″
Frog Road 67678-1224″14″
Frog Road 707011-1426″17″

Of course all children have different length arms and torsos too, so to ensure a comfortable riding position, the handlebar height can be tailored, and saddles can be slid back and forwards on their rails.(These adjustments are easy to do and just need an allen key; instructions are in the manual that comes with each bike.

Mr Raymond Perfect first kids pedal bike. Light weight and easy to use my daughter took to it straight away. Colour and size as described. Arrived in good time.
Mr Powell Great little bike, well packed, easy to set up, my grandson loves it.
Mrs Martin Excellent, riding without assistance on the same afternoon that it arrived age 3 3/4.
Gareth I was very impressed by the quality of the bike, the riding position is ideal for my little boy whilst learning
Mr Kosinskis Light and colourful bike, easy to set up my nephew love it :) Thanks
Mr Denby Excellent Christmas present for my son, who had turned 4 in October. Well built and solid. Very pleased with my purchase!
Mr Maclean Fab wee bike for starting to ride on. Light weight, easy to put together. My girl is going to love it.
JS Bike received over international delivery in good shape. Chain guard seems to require special tool for crank extraction and installation is not described in online manual. I couldn't find any information for chain guard installation. Brakes had to be readjusted but that's not a problem if you're familiar with basic bike technics. Rims seem to spin a bit unevenly/wobbly and need to be adjusted after a while like any other bike with brakes that touch the rim.
P Very good and beautiful bike. My daughter has learned to ride it without training wheels in one day!! It weighs very little, it is very easy to ride and the design is super! It comes with two spare tyres and plenty of accessories. I highly recommend it!! Very good price in Merlin Cycles.
Packer This is a lovely bike, bright orange, with reflector and bell (which seem to be priorities when you're 3!). We took the pedals off and lowered the seat. After a few days of scooting about, he has managed really well with the pedals and I'm hoping will take off in no time. Thank you, prompt delivery and communications too.