BadassBox 5 Tuning Kit for Bosch Rim Magnet eBikes - Gen4 CX

Name: BadassBox 5 Tuning Kit for Bosch Rim Magnet eBikes - Gen4 CX
Rating: 5.0 (3 reviews)

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£229.00GBP

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New for Spring 2025. Built specifically for Bosch Gen4 CX eBikes with a Rim Magnet sensor (mounted on the rear wheel valve).

This tuning kit removes the 15mph or 20mph factory speed limit, giving you the freedom to ride faster, further, and without restriction.

DIY Install. No motor removal.

Installation is completely non-invasive — simply clip the box to your bike's frame and attach the coil to the motor. No need to remove the motor or touch any of your bike’s internals. Download Instructions here (PDF)

You can also connect it to your smartphone via the free Boost Buddy app (available on iOS & Android) for enhanced control and data visibility.

Important to know:

As this tuning kit works externally, your eBike’s onboard display won’t show accurate speed or distance once installed. When riding above the speed limit, your bike will continue recording distance at a fixed 23–24 km/h (15mph) for consistency.

⚠️ For off-road use only. Not legal on public roads. Read full legal disclaimer .

Product Benefits

Why choose this product:

Easy to install, no specialist tools or skills required
Permanently overrides 25kmh factory speed limit once fitted
AAA battery for range in excess of 7,000km
Designed & manufactured in Germany
Boost Buddy App for your correct speed on iOS and Android
30 day money-back guarantee

Compatibility

eBikes fitted with a Bosch Performance Line CX Gen4 motor only
eBike must also have a Rim Magnet sensor (located on rear wheel valve)

Firmware Updates

Updating your eBike’s motor firmware may block or disable your tuning kit.

We recommend avoiding firmware updates—especially through service centres—unless absolutely necessary. Most updates are optional, and a working eBike doesn’t usually need one.

Keep in mind:

✔ Firmware upgrades can remove tuning compatibility

✔ Tuning is only guaranteed to work with the firmware version available at time of purchase

✔ A blocked tuning kit due to a firmware update is not covered under warranty

If you’re unsure, reach out before updating. We’re here to help you keep your ride running exactly how you like it.

Shipping & Returns

We ship fast and free to the UK, USA, Australia & Canada. All orders are fully tracked and dispatched from our UK warehouse.

✅ Tariff-free shipping to the USA & Australia.

❌ Note: Orders to Canada may incur customs charges. Free shipping doesn’t apply to EU/EEA countries.

Changed your mind? No problem. We offer 30-day returns — no hassle, no stress.

If something’s not right, we’ll sort it.

🔍 See full Shipping & Returns info here

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BadassBox vs Other Brands

Discover why this tuning kit is right for you

Easy to fit, no specialist tools needed

Pairs with Boost Buddy App

Customise to suit your needs

30 Day Money Back Guarantee

Badass Box 5

Other Tuning Kits

Removes 15/20mph speed limit

No tools required

Pairs with phone

Easy to install

Activation within app

Easy installation. Just be careful with the holder part. It's kind of weak as it's a 3D printed part.

I was tired of hitting the 19 mph wall on my '23 Wild so decided to take the plunge as this looked like a clean install. The package arrived quickly and was indeed easy to get setup on the bike, took maybe 45 minutes going real slow and carefully. Once installed, jumped on the bike and it worked immediately. First time on the trail the bike felt like it was designed to work. Rarely hit the speed limit but when I did it felt like a normal bike, not the 50 pound brick it is. On tight trails you don't know it's there, but open fire roads or the ride home it's great to go a bit faster and the bike feels much more natural. Highly recommend!

Took some fine adjustment to get the strip that fits up & behind the motor to work on my Haibike Trekking 8 but having now ridden 20 miles I’m very pleased with the results. It’s transformed my daily commute now the restriction does not kick in and take all the momentum away, highly recommended.

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BadassBox 5 Tuning Kit for Bosch Rim Magnet eBikes - Gen4 CX