Monocoque Frame
Summary A monocoque frame is a bicycle frame design in which structural loads are carried primarily by the outer shell rather than an internal skeleton. Most commonly associated…
Velopedia Entries
An evolving encyclopedia of cycling brands, technologies, components, and history.
Void Content
Summary Void content refers to the proportion of microscopic air pockets or empty spaces trapped within a composite material, most commonly carbon fiber reinforced polymer. In bicycle frames…
Clutch Derailleur
Summary A clutch derailleur is a rear derailleur equipped with a chain-stabilizing mechanism that increases cage resistance to uncontrolled movement. By reducing chain slap and limiting derailleur bounce…
Derailleur Hanger
Summary A derailleur hanger is a small, replaceable frame component that mounts the rear derailleur to the bicycle frame. Designed to bend or break under impact, it serves…
Derailleur
Summary A derailleur is a bicycle drivetrain component that moves the chain between gears to change the effective gear ratio. By guiding the chain across sprockets or chainrings,…
Bosch
Summary Bosch is a German engineering company whose eBike Systems division has played a central role in shaping the modern electric bicycle. Known for tightly integrated mid-drive motors,…
Hub Spacing
Summary Hub spacing refers to the distance between the outer faces of a bicycle hub’s axle, measured where it interfaces with the frame or fork dropouts. It defines…
Hub Flange Spacing
Summary Hub flange spacing describes the lateral distance between the left and right spoke flanges on a bicycle hub. It is a critical structural parameter that influences spoke…
Wheel Dish
Summary Wheel dish refers to the lateral centering of a bicycle wheel’s rim relative to the hub and frame. A properly dished wheel places the rim equidistant between…
Firmware
Summary Firmware is the embedded software that controls how electronic hardware behaves at a fundamental level. In modern cycling systems—particularly electronic drivetrains and e-bikes—firmware governs motor response, shifting…
Controller
Summary A controller is the electronic control unit that manages how an electric bicycle motor delivers power. Acting as the system’s central decision-maker, the controller interprets sensor data,…
DJI Avinox
Summary DJI Avinox is a lightweight, high-power mid-drive e-bike motor system developed by DJI for performance-oriented electric mountain bikes. Designed to combine low system weight with high peak…