Serea: Transforming Your Smartphone into a Bicycle Key

Serea is revolutionizing bicycle security with its innovative approach—introducing the Bold and Swift, two smart bike locks that eliminate the need for traditional keys and batteries. Instead, users can unlock their locks using the free Serea app on their smartphones. This technology primarily targets cyclists who frequently use e-bikes, cargo bikes, or city bikes and wish to share their locking mechanism with others effortlessly.

A Keyless Solution

A bicycle key may be a small item, but its tendency to go missing or be left at home is all too common. With Serea’s chain locks, your smartphone completely replaces the need for a physical key. This means no bulky keyring to carry, and no worrying about battery life.

Unlocking via NFC

To access the lock, simply launch the Serea app and hold your smartphone near the lock. Using Near Field Communication (NFC), your phone sends a small energy pulse to unlock the mechanism. The lock itself is battery-free, requiring no charging whatsoever.

When manually locked, kinetic energy is stored in a spring. The smartphone’s NFC pulse is sufficient to release the mechanism again. According to Serea, each digital key is tied to a user’s personal profile, secured by cryptographic technology similar to that used in mobile payments. The robust casing also protects the mechanism from water and dust.

This battery-free design marks a significant distinction from many other smart locks, removing the need to check charge levels or replace batteries over time. As long as your smartphone has NFC capabilities and enough battery life to run the app, you’re good to go.

A Shareable Digital Key

The digital system offers remarkable benefits for those sharing a bike. Administrators can grant others access through the app and revoke it when needed—a handy feature for partners, families, coworkers, or employees sharing a bike or cargo bike.

The app also logs who used the lock and when, making it easier to track usage when multiple individuals have access. Even if your smartphone is charging or you’re using a different device temporarily, you can log in with your account. The customer service is readily available via the app should you have questions.

Serea Bold: Designed for E-Bikes and Cargo Bikes

The Serea Bold stands out as the more robust option among the two models. Featuring an 8mm thick pewag chain, it comes in lengths of 100 cm and 125 cm and weighs either 2.2 or 2.7 kg, depending on the length. The locking mechanism housing is machined from a single block of hardened steel.

With a security rating of 13 out of 15, Serea positions the Bold as an ideal choice for more valuable bicycles, including e-bikes and cargo bikes. It has received both the British Sold Secure Pedal Cycle Silver certification and the Dutch ART 2 quality mark.

An ART 2 lock is specifically designed for bicycles and offers considerable protection against theft, making it a requirement for many bike insurance policies. The ART foundation advises securing a bike with a secondary lock to an immovable object, like a bike rack, for added security.

Serea Swift: Lightweight and Flexible

For those in search of a lighter and more manageable chain lock, the Serea Swift is the answer. This model features a 6mm thick pewag chain and is also available in lengths of 100 cm and 125 cm, weighing just 1.4 and 1.6 kg respectively. Beyond the classic black, the Swift also comes in an eye-catching orange variant.

Within Serea’s rating system, the Swift scores a 9 out of 15 and carries the Sold Secure Pedal Cycle Bronze certification. This model is primarily aimed at everyday use, where flexibility and low weight are essential.

The Swift’s battery-free design, digital access control, and relatively light weight earned it a Design & Innovation Award 2026 in the Urban category, recognized for features such as the ability to share digital access temporarily or permanently and the integrated usage history, complete with location data.

Backed by Pewag’s Expertise

Serea is a member of the Austrian Pewag Group, a well-established manufacturer with a long tradition of chain production. The name Serea itself is derived from the English words “secure,” “reliable,” and “easy,” summarizing the brand’s commitment to creating smart bike locks.

The Bold and Swift models combine a traditional hardened chain with modern digital access via a smartphone. For maximum protection, the heavier Bold is your best bet, while the Swift offers a practical solution for daily urban commuting without sacrificing convenience.

Sources

• Recent articles from 2026 on smart bike locks and their features.
• Industry reports discussing security standards and certifications for bicycle locks.