{"id":18590,"date":"2026-04-20T11:17:33","date_gmt":"2026-04-20T15:17:33","guid":{"rendered":"https:\/\/blogs.sw.siemens.com\/solidedge\/?p=18590"},"modified":"2026-05-14T17:54:24","modified_gmt":"2026-05-14T21:54:24","slug":"splim-bike-when-chasing-kids-lead-to-a-game-changing-invention","status":"publish","type":"post","link":"https:\/\/blogs.sw.siemens.com\/solidedge\/splim-bike-when-chasing-kids-lead-to-a-game-changing-invention\/","title":{"rendered":"SPLIM Bike: When chasing kids leads to a game-changing invention"},"content":{"rendered":"\n

Every parent knows the moment: your toddler discovers gravity on a balance bike and barrels downhill\u2014while you suddenly realize you\u2019re not nearly as fast as you thought. For Jin Calta, that moment wasn\u2019t just a parenting challenge. It was the start of an engineering solution.<\/p>\n\n\n\n

Calta, a design engineer by trade, first observed the problem while watching his sister. Later, experiencing it himself as a parent, he approached it the way engineers do\u2014by asking whether a technical solution could exist. That question became the foundation of SPLIM, a Czech Republic-based hardware startup developing a balance bike with an integrated speed limiter.<\/p>\n\n\n\n

\u201cMany parents know this problem well,\u201d Calta explains. \u201cI saw parents running after their children, then I had my own child, and I had the same problem. I thought, \u2018there must be a technical solution.\u2019\u201d<\/p>\n\n\n

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SPLIM is redefining the balance bike with a regulated speed system. (Image: SPLIM.)<\/em><\/figcaption><\/figure><\/div>\n\n\n
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Rethinking the balance bike<\/h3>\n\n\n\n

At first glance, the SPLIM bike looks like any modern balance bike: lightweight, minimal, and designed for young riders. But inside the rear wheel sits a mechanical innovation\u2014a speed-limiting system that allows parents to set a maximum pace.<\/p>\n\n\n\n

Once that speed is reached, an integrated braking mechanism automatically engages, preventing further acceleration. The limiter can also be switched off entirely, allowing the bike to function like a conventional model.<\/p>\n\n\n\n

The concept is simple but transformative. Children maintain their independence, while parents regain peace of mind. Instead of sprinting downhill, families can walk comfortably side by side.<\/p>\n\n\n\n

Weighing just 3.3 kilograms, the bike remains competitive with the lightest models on the market. Its frame uses glass fiber\u2013reinforced plastic produced through gas-assisted injection molding (GAIM), combining durability with flexibility. But the real innovation lies in the engineering behind the speed control mechanism.<\/p>\n\n\n\n

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SPLIM bike assembly<\/figcaption><\/figure>\n\n\n\n
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FEM analysis in Solid Edge<\/figcaption><\/figure>\n\n\n\n
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The innovation: a speed-limiting system <\/figcaption><\/figure>\n<\/figure>\n\n\n\n
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Engineering first, everything else second<\/h3>\n\n\n\n

Before founding SPLIM, Calta worked on products ranging from chainsaws to industrial induction heating systems. That background shaped his development philosophy.<\/p>\n\n\n\n

Rather than relying on rapid prototyping and trial-and-error iteration, he began with theory.<\/p>\n\n\n\n

\u201cI made a mathematical model,\u201d he says. \u201cI optimized parameters like spring stiffness and brake forces in an Excel sheet. So, when I built the first prototype, I already knew it would work.\u201d<\/p>\n\n\n\n

This physics-driven approach reduced uncertainty early and accelerated development once prototyping began. Early versions were tested and refined under real-world conditions\u2014often with his own children as riders.<\/p>\n\n\n\n

Like many engineering journeys, however, it wasn\u2019t without improvisation. \u201cI even used duct tape for the first prototype,\u201d Calta admits.<\/p>\n\n\n\n

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Designing with Designcenter X Solid Edge<\/h3>\n\n\n\n

To bring the concept to life, Calta turned to Designcenter X Solid Edge, part of the Siemens Xcelerator portfolio. Already familiar with the software from his professional career, he used it not just for CAD modeling, but as a core engineering tool.<\/p>\n\n\n

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Calta used his professional design-engineering experience and background with <\/em>
Designcenter X Solid Edge to develop a way to control the speed of a child\u2019s bike. (Image: SPLIM.)<\/em><\/figcaption><\/figure><\/div>\n\n\n

One of the biggest challenges was ensuring structural integrity under real-world stress. Inside the speed limiter, plastic gears transfer braking forces. Under heavy loads\u2014such as downhill riding\u2014these components risk deformation, which can lead to gear skipping.<\/p>\n\n\n\n

Using integrated finite element method (FEM) analysis within Solid Edge, Calta identified and resolved the issue.<\/p>\n\n\n\n

\u201cI used FEM to optimize the geometry and increase stiffness,\u201d he explains. \u201cThe deformation was too high, so I adjusted the design to make it more rigid.\u201d<\/p>\n\n\n\n

This was not abstract simulation\u2014it directly addressed a failure mode observed during testing. The result: a robust mechanism capable of handling dynamic loads without compromising performance.<\/p>\n\n\n\n

Beyond engineering, Solid Edge also supported SPLIM\u2019s early go-to-market efforts. Integrated rendering tools enabled the creation of high-quality visuals for the website and promotional materials\u2014long before mass production or professional photography were feasible.<\/p>\n\n\n

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Jin Calta, founder, inventor, and CEO of SPLIM bike. (Image: SPLIM.)<\/em><\/figcaption><\/figure><\/div>\n\n\n
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From prototype to production<\/h3>\n\n\n\n

Today, SPLIM is transitioning from development to scaling. Around 20 working prototypes have been produced, combining off-the-shelf components with custom-designed parts\u2014many manufactured via 3D printing.<\/p>\n\n\n\n

Approximately 10 components are printed using ASA material, selected for its durability and UV resistance. While the design is largely finalized, scaling production presents the next major challenge.<\/p>\n\n\n\n

Injection molding requires significant upfront investment in tooling. Without it, production remains limited to small batches.<\/p>\n\n\n\n

\u201cScaling production requires significant investment in tooling, which is why I\u2019m currently looking for an investor or a strategic partner,\u201d Calta says.<\/p>\n\n\n\n

In the meantime, SPLIM is following a phased strategy: producing smaller quantities, validating demand, and reinvesting revenue to support growth.<\/p>\n\n\n\n

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The reality of building a hardware startup<\/h3>\n\n\n\n

SPLIM\u2019s journey underscores a fundamental truth: building physical products is very different from building software. Development cycles are longer, costs are higher, and every design decision carries lasting implications.<\/p>\n\n\n\n

Despite these challenges, early signals are promising. Initial prototype runs sold out through pre-sales, demonstrating strong interest from parents.<\/p>\n\n\n\n

\u201cIt\u2019s a new product,\u201d Calta notes. \u201cBut parents understand it immediately\u2014they know the situation where their child rides away too quickly.\u201d<\/p>\n\n\n\n

As Calta transitions from engineer to entrepreneur, he gains direct access to customer feedback\u2014insights that continue to refine the product. This blend of technical rigor and market awareness is a defining strength at this stage.<\/p>\n\n\n\n

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Engineering precision applied to real life<\/h3>\n\n\n\n

SPLIM\u2019s ambition is not rapid disruption, but focused excellence. The goal is clear: build one product that works exceptionally well.<\/p>\n\n\n\n

\u201cEverything looks pretty promising at the moment,\u201d Calta says. \u201cSPLIM could become a company selling tens of thousands of bikes per year.\u201d<\/p>\n\n\n\n

This is not innovation for its own sake. It is engineering applied to a real-world problem\u2014a child\u2019s bike, a parent\u2019s concern, and a better way to balance both.<\/p>\n\n\n\n

By combining disciplined engineering, practical tools like Designcenter X Solid Edge, and a deep understanding of user needs, SPLIM demonstrates how thoughtful design can transform even the simplest everyday experiences.<\/p>\n\n\n\n

To learn more, visit Siemens.<\/p>\n","protected":false},"excerpt":{"rendered":"

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