Bike repair is one of the most approachable DIY categories: flats, brake pads, cable tension, chain wear, gear indexing, hub adjustment, and basic tune-ups. Whether you ride a road bike, mountain bike, hybrid, or e-bike, most issues come from wear, poor setup, or a crash that knocked something out of alignment. Identify your bike by brand and model (and motor/system on e-bikes). Brake type (rim vs disc, mechanical vs hydraulic), drivetrain speed, and wheel size change the parts and steps. Keep a basic kit: tire levers, pump or CO2, multi-tool, chain tool, and the correct hex/torx bits. Safe DIY territory includes tubes and tires, brake pad swaps, cable replacements, chain installs, and derailleur indexing. Leave hydraulic brake bleeds, carbon torque-critical builds, and e-bike electrical diagnostics to a shop if you are unsure — wrong torque or a pinched hose can be dangerous. Browse Bike guides by brand and model for step-by-step fixes that match your drivetrain and brake setup.