Wattage doesn’t tell you how a motor climbs — torque does. Here’s why a mid-drive kit outclimbs a same-rated hub motor, how to match a kit to your gradient (using Caerphilly Mountain as a real benchmark), and what gearing and battery choices actually matter on hills.
Guides • Bafang • Error Code Reference Bafang Display Error Codes Explained: Troubleshooting Guide By George — Qualified Mechanic & eBike Specialist, All4eBikes Cardiff •
68mm or 73mm BSA isn’t the whole story. A full compatibility check covering common UK bike brands, press-fit adapters, e-MTB suspension clearance, and exactly how to measure your own bottom bracket.
A throttle that works above 3.7mph makes your e-bike a motor vehicle in the eyes of UK law. Here’s the exact EAPC rule, the one narrow legal exception, and how we verify it before handover.
Forget torque and efficiency for a moment — here’s the pure money question: what a mid drive vs hub motor conversion actually costs over three years once drivetrain wear and fitting are factored in.
From a £300 hub motor commuter build to a £1,300+ performance rig — a full breakdown of what an e-bike conversion actually costs in the UK, including the fitting and battery costs most guides leave out.
3–5 years or 500–800 cycles is the textbook answer — but the real question is knowing when yours is actually done. How we test remaining capacity on the bench, and when to replace vs repair.
Intermittent cutout, a display error code, a knocking rear wheel — a symptom-to-cause diagnostic reference for the faults that actually come across our workbench most often.
DIY or book it in? The real difference isn’t just price — it’s the install warranty, realistic turnaround time, and what happens if you get partway through a self-fit and get stuck.
Thinking of unlocking the extra power on a Bafang kit you already ride on the road? Here’s what actually changes legally, what UK cycle insurers say, and why we won’t do it for a bike that’s staying on public roads.
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