# He Needed a Bike For His Rescue Dogs—So I Built One!

Source: https://www.youtube.com/watch?v=ZOSUEDeQ0FM
Recap page: https://rapidrecap.app/video/ZOSUEDeQ0FM
Generated: 2025-09-21T12:33:47.591+00:00

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## Quick Overview

The creator successfully converted a Surly Timberjack mountain bike into a single-speed commuter e-bike, overcoming challenges with component compatibility and installation to create a functional and practical electric bicycle.

**Key Points:**
- The project involved converting a Surly Timberjack mountain bike into a single-speed e-bike suitable for commuting and towing.
- The conversion utilized a Bafang BBS02 mid-drive motor kit, an 11-speed cassette, and a 48V 10.5Ah battery.
- Challenges included the motor's BCD not being compatible with the stock chainring, requiring a custom adapter and a different chainring.
- The original handlebars were too narrow for the e-bike components, necessitating a handlebar swap.
- The bike's existing suspension fork was retained, providing comfort and capability for varied terrain.
- After the conversion, the bike weighed 40 lbs 2 oz (18.2 kg) and performed well in testing, achieving speeds of up to 20 mph with pedal assist.

![Screenshot at 00:41: The creator demonstrates installing the Bafang BBS02 mid-drive motor onto the Surly Timberjack bicycle frame, showcasing a key step in the e-bike conversion process.](https://ss.rapidrecap.app/screens/ZOSUEDeQ0FM/00-00-41.png)

**Context:** The video documents a DIY project to transform a standard mountain bike into a more practical electric commuter bike, suitable for everyday use and even light hauling with a trailer. The creator details the challenges and solutions encountered during the build, highlighting the process of integrating an electric mid-drive motor, battery, and associated components.

## Detailed Analysis

The creator details the process of converting a Surly Timberjack mountain bike into a single-speed e-bike, emphasizing its suitability for commuting and towing. The build utilizes a Bafang BBS02 mid-drive motor, which required a custom adapter to fit the stock chainring due to BCD incompatibility. The creator also encountered issues with narrow handlebars not accommodating the new e-bike controls, necessitating a handlebar replacement. The project involved installing a 48V 10.5Ah battery, an 11-speed cassette, and various other components to complete the e-bike system. The finished product weighed 40 lbs 2 oz (18.2 kg). Testing revealed the bike could reach speeds of up to 20 mph with pedal assist, demonstrating the effectiveness of the conversion. The creator also addressed minor issues like a broken spoke nipple and the need for a better cable management solution, showcasing a practical approach to problem-solving during the build.

### E-bike Conversion

- Installation of Bafang BBS02 mid-drive motor
- Swapping narrow handlebars for wider ones
- Integrating a 48V 10.5Ah battery
- Replacing a broken spoke nipple
- Cable management solutions

### Testing and Performance

- Bike weighed 40 lbs 2 oz
- Achieved 20 mph with pedal assist
- Smooth gear shifting with 11-speed cassette
- Functional brakes with ample stopping power

### Challenges Encountered

- BCD incompatibility requiring custom adapter
- Narrow handlebars unsuitable for e-bike controls
- Broken spoke nipple
- Cable management issues

### Customization and Upgrades

- 3D printed battery mount
- Cable routing shroud
- Upgraded handlebars for better component fit

![Screenshot at 00:41: Installation of the Bafang BBS02 mid-drive motor onto the bicycle frame.](https://ss.rapidrecap.app/screens/ZOSUEDeQ0FM/00-00-41.png)
![Screenshot at 00:50: Close-up of the chain and crankset during the e-bike conversion.](https://ss.rapidrecap.app/screens/ZOSUEDeQ0FM/00-00-50.png)
![Screenshot at 01:01: The creator rides the converted bike up a ramp, testing its climbing ability.](https://ss.rapidrecap.app/screens/ZOSUEDeQ0FM/00-01-01.png)
![Screenshot at 01:14: Detail shot of the dropper seatpost, highlighting its functionality.](https://ss.rapidrecap.app/screens/ZOSUEDeQ0FM/00-01-14.png)
![Screenshot at 01:50: View of the rear cassette and derailleur system on the e-bike.](https://ss.rapidrecap.app/screens/ZOSUEDeQ0FM/00-01-50.png)
![Screenshot at 02:08: The creator holds up the Bafang mid-drive motor, explaining its features.](https://ss.rapidrecap.app/screens/ZOSUEDeQ0FM/00-02-08.png)
![Screenshot at 02:27: Components laid out for the build: cassette, chain, brake rotors.](https://ss.rapidrecap.app/screens/ZOSUEDeQ0FM/00-02-27.png)
![Screenshot at 03:02: The creator demonstrates fitting the mid-drive motor into the bike frame.](https://ss.rapidrecap.app/screens/ZOSUEDeQ0FM/00-03-02.png)
![Screenshot at 03:56: Various bike parts and tools organized in storage bins.](https://ss.rapidrecap.app/screens/ZOSUEDeQ0FM/00-03-56.png)
![Screenshot at 04:46: Close-up of the motor's wiring harness, showing connectors for the display and throttle.](https://ss.rapidrecap.app/screens/ZOSUEDeQ0FM/00-04-46.png)