E-bike Conversion

Chapter 1: The Conversion Blueprint: What You Need to Know Before You Buy Anything

Every e-bike conversion starts the same way: with a perfectly good bicycle that's about to become something better. You've got a frame you trust, wheels that roll true, and a drivetrain that's carried you through thousands of miles. Now you're going to bolt a motor to it and a battery to that, and you're going to double—maybe triple—the distance you can cover before your legs give out.

But here's the thing that separates a conversion that lasts five years from one that lasts five weeks: the decisions you make before you open your wallet. Not after. Before.

I've been doing this since 2013, when the best option was a 350W geared hub motor from a Chinese vendor with a 30-day shipping window and a manual that read like it was translated from Mandarin through German and then back to English. I've melted connectors, cooked battery packs, and snapped torque arms. I've watched a 72V 20Ah pack turn into a smoking, hissing brick on my workbench because I didn't check the BMS balance leads before the first charge. I made these mistakes so you don't have to.

This chapter is the blueprint. It's the mental model you need before you buy anything—before you add that 1,500W mid-drive kit to your cart, before you convince yourself that a 72V 30Ah battery is "future-proofing," before you discover that your frame's bottom bracket is 73mm when the motor you ordered