Velopedia Guides

Bicycle buying, inspection, service, and specification guides

Practical guidance for evaluating used bikes, understanding archived data, solving compatibility questions, and working on modern bicycles.

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Buying & Inspection

Inspecting a Used Bike Bottom Bracket and Frame Shell

A complete bike and a bare frameset expose different evidence. On a complete bike, check for play, rough rotation, a loose crankarm, and movement between the cups and frame. On…

Updated August 15, 2026 Read guide

Buying & Inspection

Checking Drivetrain Wear Before You Buy

A drivetrain can shift neatly on a repair stand and skip as soon as the rider pushes on the pedals. It can also be scrubbed clean the morning of the…

Updated August 15, 2026 Read guide