About WattWorks

A free parts database and build configurator for e-bike conversions.

Planning an e-bike conversion means juggling spec sheets across dozens of product pages, trying to figure out which controller works with which motor, whether the connectors match, and if the battery voltage is right. I got tired of doing that in a spreadsheet, so I built WattWorks.

It's a database of e-bike conversion parts: hub motors, mid-drives, batteries, controllers, displays, connectors, and more. Every component has specs, purchase links from multiple sellers, and price history. The build tool lets you pick parts and automatically checks whether they're compatible.

How compatibility checks work

When you add components to a build, the system runs checks automatically:

Voltage matching

Battery, controller, and motor voltage ranges overlap

Connectors

Port connectors match in pin count, type, and gender

Physical fitment

Dropout width, bottom bracket size, wheel size, axle compatibility

Protocols

Display communication protocols match between controller and display

Current ratings

Controller output vs motor rating and battery discharge capacity

Checks are conservative — a warning means something is worth double-checking, not necessarily that parts won't work. See the full methodology for all 36 checks.

Pricing data

Prices are updated regularly and sourced from multiple retailers. Every seller I know about is shown for every product, regardless of affiliate relationships. Nothing is ranked or hidden based on commission.

Data sources

Specs come from manufacturer datasheets, product pages, and manual verification. I do my best to keep things accurate, but if you spot something wrong or missing, let me know.

Support the project

WattWorks is free and I plan to keep it that way. If it saved you some time on your build, here are a couple ways to help keep it running:

Donate on Ko-fi Subscribe on YouTube

Affiliate links

Some product links on WattWorks are affiliate links. If you buy through them, I get a small commission at no extra cost to you. This helps cover hosting and development.

Affiliate links never influence what's shown or how products are ranked. Every seller I know about is listed regardless of whether they have an affiliate program.

Contact

Have a question, spotted incorrect data, or want to help with data entry? Reach out at [email protected]. I'm one person so responses may take a bit.

To report inappropriate content or images, email [email protected].