E-Bike / Cycling Glossary

Welcome to the Savvy Cycling glossary page. If you know of terms we have missed please contact us.

Aero HelmetAn aerodynamic helmet to reduce wind drag. Often used in time trials.
AmpsA unit of electrical currents
ATBAll terrain bicycle
Bikeways A bicycle lane or path
Bosch Active LineA Bosch created motor system that powers the bike
Bosch PurionAn onboard computer system that is attached to the handlebars of the bike. The Purion shows the display and provides the assistance required when riding
Bottom bracket (BB)This is bearing assembly which allows the crank to rotate relative to the frame. There are various types of bottom brackets.
BPMBeats per minute. Refers to heart rate.
Brushless MotorOld motors had "brushes" to make physical electrical connections to the windings that produce the electro-magnetic fields which make the motor turn. These are inefficient and prone to wear! Modern "brushless" motors use positional sensors that signal when to switch winding circuits.
CadenceThe number of pedal strokes per minute.
CampagnoloItalian manufacturer of components and wheelsets.
Clipless PedalsPedals with a locking mechanism for cleats. There are different types of clipless pedals including Look, Shimano SPD etc.
CompressionCompression settings allow you to adjust the sensitivity of your fork or rear shock.
Continuous PowerThe ability of the motor to output its power continuously for a certain period of time
Crank DriveSome electric bikes have their motor in the centre of the bike, driving the crank. They can be noisey, being attached to the hollow frame which can act as a "sound box".
Deep CycleA rechargeable battery that was fully discharged
DisplayThe display is attached to the handlebars of the bike and shows you useful information about your electric bike while it is being used
Dropper SeatpostA dropper seatpost can be adjusted in height via a remote on the handlebar.
E-bikesA shortened term to describe electric bikes
Gear RangeThe gear range is the difference between the highest and lowest available gears.
Gear RatioThe gear ratio refers to the ratio between the front chainring and rear sprocket.
Hub MotorWhen the motor is located in the front or rear hub on the electric bike
Integrated BatteryWhen the battery used to power the electric bike is fully hidden (integrated) within the frame
LiFePO4Lithium phosphate battery
Motor SystemThe motor system is what gives an electric bike its power. Motor systems can be front-wheel, rear-wheel or mid-mount systems
Newton Meters (NM)The torque (or power) output of the motor
Pedal SensorSo the controller knows when the pedals are being turned a small sensor is used, attached to the crank. This sends a signal to the controller which starts the motor
Pedelec (Pedal Electric Cycle)A Pedelec is a bicycle with electric pedal assistance up to speeds of 25 km/h
PowerpackPowerpack can be another term for battery when talking about electric bikes
Power DensityPower capacity of a battery in relation to it’s weight
Rebound DampingThe rebound damping allows you to adjust the speed at which your fork or shock extend after being compressed.
SagAlso known as “negative travel,” the sag is the amount a fork or rear shock compresses under your body weight whilst sitting still on the bike.
Semi-Integrated BatteryWhen the battery used to power the electric bike is partly hidden (integrated) within the frame
Support LevelsA term used to describe the difference power assistance levels provided by the electric bike system
TandemA bicycle for 2 riders.
ThrottleA twist grip on the right side of the handle bar that provides instant power to the motor - great for setting off into traffic
Top TubeThe part of the frame that attaches the head tube to the seat tube
TorqueTorque is measured in Newton meters (Nm) and describes the rotational power of the motor
TransXTransX are an electric bike motor system manufacturer that provide the motor, display, and components for bikes
TravelTravel is the amount your fork or rear suspension can compress and extend.
VoltsThe standard unit used to measure how strong an electrical current is that is sent around an electrical system
Walk FunctionProvides you assistance when pushing your bike up to 6mph
Watt Hours (WH)The watt-hours signify the capacity of the battery that comes with the bike. The watt-hours of the battery are calculated by Volts x Amps
WattThe law limits the nominal power of an eMTB motor to 250 W.