How to Size a Child for a Frog Bike | Kids’ Bike Fitting Guide in Derby
Sizing Up a Frog Bike: When it comes to choosing the right bike for your child this Frog Bike Size Guide might help. Frog Bikes stand out from the crowd. Unlike many other children’s bike brands, Frog sizes their bikes by leg length rather than age — and for good reason!
Kids grow at different rates, and age alone isn’t a reliable indicator of size. Measuring your child’s inside leg length ensures a safe, comfortable, and confidence-building fit.
At Cyclo Monster in Derby we’re proud to be local Frog Bike specialists — helping families across Derbyshire, Nottinghamshire, Leicestershire and Staffordshire find the perfect fit every time.
🧍♂️ How to Measure Your Child’s Inside Leg for a Frog Bike
Follow these simple steps using our Frog Bike Size Guide:
- Have your child stand in socks against a wall.
- Place a small book snugly between their legs, as high as is comfortable.
- Ask them to step away carefully.
- Measure from the top of the book straight down to the floor.
That’s your child’s inside leg measurement.
📏 Use the Frog Bike Size Chart
Once you’ve got your measurement, compare it to the Frog Bike Size Chart (available in-store or on our website).
Each bike size shows the average inside leg length with the saddle set to its lowest height. This means your child will be able to sit comfortably with both feet on the ground — perfect for confidence and safety.
As your child grows, Frog’s long seat posts allow plenty of room for adjustment, so their bike will last for years.
🚲 Between Sizes? Here’s Our Expert Tip
If your child is between two Frog bike sizes, we recommend sizing up. This ensures the bike lasts longer and grows with your child.
👋 Visit Us in [Your Town/City] for a Free Sizing & Safety Check
While this guide is a great starting point, the best way to get the perfect fit is to visit our shop. Our friendly team will:
- Professionally size your child for the ideal Frog bike.
- Build and safety-check your new bike before collection.
- Offer a free 6-week check-over to make sure everything stays running smoothly.
- Provide ongoing local support for adjustments and advice.
Drop by Cyclo Monster, your local Frog Bike dealer in Derbyshire, and let’s get your child riding safely and confidently!
Frog Bikes Available
| Average Inside Leg in cm | Approx Age (yr) | Wheel Size | Frame Size | |
| Tadpole Mini | 24cm | 1-2 | 10″ | – |
| Tadpole | 31cm | 2-3 | 12″ | – |
| Tadpole Plus | 38cm | 3-4 | 14″ | – |
| Frog 38 | 36-41cm | 3-4 | 14″ | |
| Frog 40 (old model) | 40-53cm | 4-5 | 14″ | 9″ |
| Frog 44 | 40-53cm | 4-5 | 16″ | 9.5″ |
| Frog 47 | 43-59cm | 4-6 | 18″ | |
| Frog 52S (single Speed) | 52cm | 5-6 | 20″ | 10″ |
| Frog 53 (old model) | 52cm | 5-8 | 20″ | 10″ |
| Frog 61 | 57-74cm | 8-10 | 24″ | |
| Frog 74 | 69-91cm | 12-14 | 26″ | |
| Frog 62 (old model) | 62cm | 8-10 | 24″ | 12″ |
| Frog 69 (old model) | 69cm | 10-12 | 26″ | 14″ |
| Frog 73 (old model) | 73cm | 12-14 | 26″ | 16″ |
| Frog 78 (old model) | 78cm | 13+ | 26″ | 18″ |
| Frog Road/Track 58 | 58cm | 6-7 | 20″ | 11″ |
| Frog Road/Track 67 | 67cm | 8-12 | 24″ | 14″ |
| Frog Road/Track 70 | 70cm | 11-14 | 26″ | 17″ |
| Frog MTB 62 | 62cm (24″) | 8-10 | 24″ | 12.5″ |
| Frog MTB 69 | 69cm (27″) | 10-12 | 26″ | 15″ |
| Frog MTB 72 | 72cm (28″) | 13+ | 26″ | 16″ |
Check out some of our kids bikes here. Call instore to find out about other bikes that we can order
Dont forget to add a Frog Kick stand to the bike, its a great way to keep the bike safe from scratches and store neatly in the garage.
Frequently asked questions about frog bikes
Where are Frog Bikes Made?
Frog Bikes are manufactured in the UK (Pontypool factory in South Wales).
Originally they were made in China but production was moved to the UK in 2016.
Are frog bikes worth the money?
Cyclo Monster has been retailing Frog Bikes since they first became available, their quality vs price was exactly the sort of child’s bike we were looking for to stock after we first opened. We have been selling them ever since and we feel they are one of the best brands around to start your children riding. Our staff’s kids all ride Frog Bikes.
Why are frog bikes so expensive?
Frog Bikes are certainly more expensive than some basic bikes. However, if you compare the weights and specifications it will soon become apparent why it’s worth spending extra to buy a Frog Bike. Weight is one of the most important elements when choosing a children’s bike.
It could be the difference between your child loving or hating the cycling experience.
You wouldn’t strap a rucksack full of weights to your child’s back before sending them out for a bike ride and expect them to ride very far. That’s why we believe it’s worth spending a little extra on a bike. Frog Bikes hold up very well in the second-hand market and they are very easy to sell privately and often for a very good price.
What is the smallest frog bike?
The smallest frog bike available is the 40, this is suitable for children with an inside leg measurement of around 40cm, typically suitable for kids aged 3-6, which is equivalent to around a 14-inch bike. This bike is very light and very easy for a small child to ride. It could also be used as a balance bike by removing the pedals until they have learned to balance properly on the bike.
What is a frog bike paint plaster?
When you buy a new frog bike you usually get a pack of stickers in the same colour as the bike, these can be used to stick over any scratches should your little one decided not to be as careful with the bike as you might like.
Do frog bikes come with 2 sets of tyres
Frog bikes no longer come with 2 sets of tyres, instead, they now come with a general-purpose tyre suitable for most types of riding on or off-road.
Are there any alternatives to Frog Bikes
There are some alternatives to Frog Bikes including Squish Bikes, Cuda Bikes, Raleigh, Cube and Scott
We hope our Frog Bike Size Guide article was helpful, please get in touch with any questions
About Frog Bikes
Frog Bikes are a British company that designs and manufactures children’s bicycles. Founded in 2012 by Jerry Lawson, a former professional cyclist and father of two, the company’s mission is to create bikes that are lightweight, easy to ride, and fun for kids.
One of the key features of Frog Bikes is their lightweight design. Traditional children’s bikes can weigh up to twice as much as adult bikes, making them difficult for kids to maneuver and control. Frog Bikes, on the other hand, use lightweight aluminum frames and components, making them much easier for kids to handle. This not only makes riding more enjoyable for kids, but it also helps to improve their balance and control, which is crucial for their safety.
Another important aspect of Frog Bikes is their attention to detail. The company takes great care to ensure that their bikes are designed and built to the highest standards, with a focus on safety, durability, and performance. This includes things like using high-quality materials, such as lightweight aluminum, and incorporating features like v-brakes and suspension forks to improve the bike’s handling and stability.
Frog Bikes also offer a wide range of models to suit different ages and riding styles. They have balance bikes for toddlers, pedal bikes for young children, and even hybrid bikes for older kids. This allows parents to choose the perfect bike for their child, whether they are just learning to ride or are ready for more advanced terrain.
One of the most popular models from Frog Bikes is the Frog 53. This bike is designed for children between the ages of 5 and 8, and is the perfect choice for kids who are just learning to ride. It features a lightweight aluminum frame, v-brakes, and a simple, easy-to-use single speed drivetrain. The bike also comes with a kickstand, a bell, and a set of reflectors, making it safe and easy for kids to ride.
For older kids, the Frog 62 is another good option. This bike is designed for children between the ages of 9 and 12, and features a lightweight aluminum frame, suspension fork, and 8-speed Shimano gears. It also comes with a kickstand, a bell, and a set of reflectors, making it safe and easy for kids to ride.
For older kids, the Frog Hybrid is a perfect option. This bike is designed for children between the ages of 12 and 16, and features a lightweight aluminum frame, suspension fork, and 8-speed Shimano gears. It also comes with a kickstand, a bell, and a set of reflectors, making it safe and easy for kids to ride.
Frog Bikes also offer a wide range of accessories to help make riding even more fun and enjoyable for kids. These include things like water bottles, bags, and even a special light that attaches to the bike’s handlebars. This helps to make riding even more fun and enjoyable for kids, and also helps to encourage them to ride more often.
Frog Bike Size Guide conclusion: Frog Bikes are a great choice for parents who want to give their kids the best possible start when it comes to cycling. With their lightweight design, high-quality materials, and attention to detail, these bikes are not only fun and easy for kids to ride, but they are also safe and durable.
Interested in a Hoy Bike instead, have a look here
