SpeedBox 1.5 for Bosch SX (Smart System + Rim Magnet)
- For Bosch Performance Line SX (Gen4) motors
- Removes the 25 km/h speed restriction
- Simple plug-in installation:
The SpeedBox 1.5 for Bosch SX (Smart System + Rim Magnet) unlocks your e-bike’s full performance by removing the factory speed limiter. Designed for Bosch Performance Line SX Gen4 motors, it delivers unrestricted assistance while maintaining smooth, reliable power. Engineered with precision for models using the rim magnet setup, it ensures accurate operation and seamless integration with your bike’s smart system.
Key Features and Benefits:
- Advanced tuning module for Bosch Performance Line SX (Gen4) motors: Removes the 25 km/h speed restriction, allowing the motor to perform at its full potential. The outcome is unrestricted assistance that matches your riding ability without compromising motor reliability.
- Precision-engineered for Smart System + Rim Magnet setup: Built for motors with the rim-based speed sensor, ensuring flawless compatibility and stable data transmission. This results in consistent performance across every ride.
- Simple plug-in installation: The compact module connects directly to the motor system using the existing wiring harness. This design makes installation fast and secure, reducing setup time and ensuring correct function from the start.
- Automatic activation system: Once installed, the SpeedBox activates itself each time the bike is powered on, meaning there’s no need for extra buttons or switches. The benefit is effortless operation with no manual setup required.
- Accurate riding data support when paired with the B.Tuning version: Riders seeking real-time data can upgrade to the SpeedBox 1.5 B.Tuning and view true values via the SpeedBox App. This helps monitor performance metrics precisely on a connected smartphone.
- Durable and motor-safe design: Built with high-quality components tested for Bosch systems, the SpeedBox 1.5 prevents error codes or damage to electronics. The outcome is long-term reliability and worry-free performance.
The SpeedBox 1.5 is made for riders who want full control of their e-bike’s power without unnecessary limits. By working seamlessly with Bosch’s Gen4 SX system, it delivers natural assistance beyond standard restrictions while keeping your ride smooth, consistent, and precise. Its design reflects deep integration with Bosch technology, ensuring both performance and protection remain uncompromised.
Enjoy the freedom of unrestricted support and precise performance tuning with the SpeedBox 1.5 for Bosch SX. Perfect for cyclists who want to unlock their motor’s full potential with a reliable, plug-and-play solution built for modern e-bike systems.
Designed for:
- Performance Line SX motors of 4. Gen
- (Motor Models BDU3144)
- (Motor Models BDU3145)
- Mounted with 2 diagonal screws
Not compatible with:
- Standard magnet
- ABS system
- SpeedBox App
| Brand | SpeedBox |
| MPN | SB15-B |
Our Payment Options
Online we currently accept payment from the methods listed above including a wide range of finance options. In store we also accept payment in the form of cash and gift vouchers.
Finance Options
In order to get the kit you want, when you need it, we offer a highly flexible range of finance options to help you get the best products on your bike now rather than at the end of the season when you've saved up the cash to make the purchase. There are even interest free options which effectively spread the cost without costing you any extra.
D.T.(Automotives) Limited T/A Tweeks Cycles is authorised and regulated by the Financial Conduct Authority and is the broker and not the lender. Our FCA registration number is 689896. D.T.(Automotives) Limited offers credit products from Secure Trust Bank PLC trading as V12 Retail Finance, Klarna and Clearpay. Credit is provided subject to affordability, age and status. Minimum spend applies. Not all products offered by Secure Trust Bank PLC are regulated by the Financial Conduct Authority. Klarna is unregulated credit. Clearpay is unregulated credit, use responsibly, T&Cs & late fees apply.
Our Finance Providers
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D.T.(Automotives)Limited trading as Tweeks Cycles offer interest free and interest-bearing credit on purchases £300 and over which is provided by V12 Retail Finance.
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We also offer Klarna, pay now, pay in 30 days or pay in 3 equal instalments.
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We also offer Clearpay pay in 4 instalments.
UK Mainland Delivery Prices
| Delivery Type | Cost | Estimated Delivery Time |
| Standard Delivery for orders under £49.99 | from £1.33 | 2-3 working days from day of despatch(Excludes weekends and Bank Holidays) |
| Standard Delivery for orders over £49.99 | Free | |
| Bike Delivery | Free | 3-5 working days from day of despatch *(Excludes weekends and Bank Holidays) |
| Express Delivery | from £1.68 | 1-2 working days from day of despatch(Excludes weekends and Bank Holidays) |
| Special Delivery | from £12.54 | For any next working day delivery order before 4.30pm Monday to Thursday. For any weekend delivery order before 4.30pm Friday |
* Bike Delivery Info
A bike has to go though a Pre Delivery Inspection (PDI Check) prior to despatch, ensuring the bike is thoroughly checked and set up prior to you receiving. This also means an express delivery service is unavailable. We strive to despatch bikes within 3-5 working days. Please note this may change over school holidays and the festive season (November/December). For more information on the process please visit our pre-build page.
For international shipping please visit our delivery page.
For information about returning an item please visit our returns page.