About

This is a reference site on Internal gear hubs on e-bikes: how a hub gear works inside the rear wheel, how it differs from derailleur gears, how it pairs with a motor, and what makers' manuals say about shifting, oil, adjustment and wheel removal, kept deliberately narrow.

Facts on these pages come from published sources, such as makers' documentation, official pages and reference works, and each page links to the ones it used. Every page shows when it was last checked.

There are no ads here, and nothing is for sale.

What you read here is general information. Your own equipment's manual comes first, and where safety or the law calls for a qualified tradesperson, use one.