A custom-made bicycle for people with achondroplasia.

When Rosa walked into our workshop with her parents, her wish was crystal clear:
A bike just like her friends'. Same color. Same shape. A basket on the front.
No exceptions, no “special solution.” Just a cool kids’ bike — in her size.

Rosa has achondroplasia — a form of dwarfism that results in different body proportions, especially shorter arms and legs. And that makes finding a suitable bike very difficult.

Because most searches end with a kind of balance bike with short crank arms.
Which is fine — if that’s what you want.
But what if you simply want to blend in with your classmates, not stand out?

At Astonic, we believe everyone deserves a bike that truly fits.
That’s why we build fully custom-made bicycles for people with achondroplasia — with complete attention to proportions, seating position, and style.

And in Rosa’s case?
It became one of the smallest bikes we’ve ever built — and one of the biggest challenges we've ever taken on.

1. Orientation & Initial Measurements
We always begin with a no-obligation consultation. Rosa came by with her parents to discuss her wishes.
We carefully measure the body — not just overall height, but also inseam and outseam, arm length, hands, and fingers. This helps us determine which frame type and proportions are needed. Based on this, we create a tailored design and a quote, which can also be used to apply for PGB funding from the municipality.

2. Building the Custom Frame
Once the quote is approved and the deposit is received, we start building a fully custom frame.
This is based on one of our existing models — such as our rugged bikes with wider tires or a lightweight, low-step model. Everything is possible, even using a picture you bring yourself as inspiration.
We order all required components — and return just as many if needed to get it exactly right. Rosa’s bike truly became a puzzle. But one we solved with love.

3. Second Fitting – Fine-tuning the Ergonomics
Once the frame is built and we’ve done a preliminary assembly, we schedule a second fitting.
Together, we choose the saddle, handlebars, and grips. We adjust the seating position, check the ergonomics, and make modifications where necessary.

4. Third Fitting – Final Adjustments & Details
Now it’s time for the final 10%. Think brake lever reach, handlebar distance, saddle height, and overall balance.
We make sure everything feels just right, so you can ride with confidence and joy.

5. Delivery & Instruction
Finally, we deliver the bike fully assembled and road-ready.
If needed, we make last-minute adjustments to the saddle or handlebars, and provide a thorough walkthrough and riding instructions — all to ensure a smooth and enjoyable start.

Cycling means freedom.
Going to school or work independently, riding to gym class with friends, taking a loop through the village — without needing help.

For children, teens, and adults with achondroplasia, that freedom often feels out of reach.
At Astonic, we bring that dream within reach.

No matter your age, height, or wishes —
we build the perfect bike, just for you.