Dein Fahrrad Lexikon: Kläre Begriffe mit Hilfe treffender Definitionen und entdecke interessante Aspekte aus allen Bereichen des Velosports
An Allen key, also known as a hexagon wrench or hex key, is a tool used to tighten or loosen screws or bolts with a hexagonal recess (hexagon socket). These special screw heads require a correspondingly shaped wrench to operate...
Anti-squat is a suspension parameter for full-suspension mountain bikes ( full-suspension bikes) that describes how strongly the rear suspension reacts to pedaling force. More precisely, anti-squat indicates the degree to which the bike compresses into the suspension or "works" against...
Das Assist-Level (deutsch: Unterstützungsstufe) legt fest, wie stark der Motor eines Pedelecs Deine Tretleistung verstärkt. Die Stufe wird am Display oder an der Bedieneinheit am Lenker gewählt und bestimmt zusammen mit Deiner Pedalkraft, wie viel Strom der Akku an den Motor abgibt.
Das Battery Management System (BMS) ist die elektronische Schutz- und Steuereinheit, die in jedem E-Bike-Akku verbaut ist. Es überwacht permanent alle relevanten Parameter der Lithium-Ionen-Zellen und greift ein, bevor kritische Zustände eintreten. Ohne BMS wäre der sichere Betrieb eines Lithium-Ionen-Akkus nicht möglich.
In the context of bicycles and e-bikes , "big bike" refers to particularly large, robust bicycles designed for heavy loads, heavier riders, or challenging terrain . While not a standardized technical term, it is frequently used in trade and marketing...
Bikepacking is a form of bicycle touring where luggage is attached directly to the frame, handlebars, and saddle – without traditional racks and panniers. The term is a combination of "bike" and "backpacking" : lightweight, off-road travel by bicycle with minimal luggage, often on unpaved or remote routes.
The Bosch Active Line Plus is a versatile and harmoniously tuned e-bike motor, particularly well-suited for city, trekking, and everyday bikes . Part of Bosch's Active Line series, it is characterized by a natural, quiet riding experience and balanced power...
Die Drive Unit BDU3360 von Bosch ist eine Mittelmotoreinheit der Performance Line Serie im „Smart System“. Sie liefert ein maximales Drehmoment von 75 Nm, unterstützt mit bis zu 340 % der eingesetzten Tretkraft und ist für Pedelecs mit einer Maximalgeschwindigkeit von 25 km/h ausgelegt.
The Bosch Drive Unit BDU38 , better known as the Performance Line CX Gen5 , is the fifth generation of Bosch's performance-oriented drive system and is aimed at sporty e-mountain bikes and demanding sporty e-bike categories. The unit combines strong...
The Bosch Hub Line is a rear hub motor from Bosch eBike Systems, which is slated for installation in electric bicycles starting in 2027. With the Hub Line, Bosch is expanding its existing motor portfolio – which until now has consisted exclusively of mid-drive motors – to include, for the first time, a hub motor system developed in-house.
A brake disc straightening tool (also brake disc straightener or disc brake straightening tool ) is a special bicycle tool used to realign slightly warped brake discs (disc brakes). A brake disc straightening tool is a handheld metal tool specifically...
On a bicycle, clamping areas are those zones where components are fixed and clamped by screw connections. These areas are particularly important for safety, as forces are transmitted here and incorrect tightening can lead to material damage or component failure....
Cleats sind die Schuhplatten, mit denen Du in Klickpedale einrastest. Hier erfährst Du, welche Cleat-Systeme es gibt, was Float bedeutet, wie Du Cleats richtig montierst und wann sie gewechselt werden müssen.
A crank puller is a special tool needed to remove the crank arms of a bicycle or e-bike from the bottom bracket axle . Because the crank arms are pressed tightly onto the axle, they usually cannot be removed without...
A crimping tool is a hand tool that permanently joins two metal parts together through plastic deformation—without screws, soldering, or gluing. The term "crimping" describes precisely this process: The tool squeezes a metal element (the crimp sleeve) around a cable or wire in such a way that a positive-locking, tensile-resistant connection is created.
Current , measured in amperes (A) , describes how much electric charge flows through a conductor per second. It is one of the central quantities in electrical engineering and also plays a crucial role in e-bikes . What does ampere...
In the context of bicycles and e-bikes, gear ratio describes the distance a bicycle travels in one complete crank revolution . It is usually given in meters per pedal revolution (m/rev) . Simply put: 👉 The unfolding shows how "far"...
The Dunlop valve , also known as a Blitz valve , is a true classic and particularly widespread in Europe. It is frequently used on traditional bicycles, city bikes, and older models. The Dunlop valve is named after the British...
EQP, kurz für Equipped, kennzeichnet Fahrräder und E-Bikes, die bereits ab Werk mit Alltagsausstattung wie Beleuchtung, Schutzblechen und teils Gepäckträger ausgeliefert werden – im Gegensatz zu sportlich orientierten Modellen, die als reines Sportgerät ohne diese Anbauteile verkauft werden.
Flat-Pedals sind breite Plattformpedale mit Pins – ganz ohne Klickmechanismus. Hier erfährst Du, wie Flat-Pedals aufgebaut sind, für wen sie sich eignen, worauf Du beim Kauf achten solltest und wie sie im Vergleich zu Klickpedalen abschneiden.
The freehub body , also known as a cassette freehub , is a key component of the rear-wheel drive on a bicycle. It connects the rear hub to the cassette and allows the wheel to continue turning even when the...
Ein Gabelschlüssel ist ein Schraubenschlüssel mit offenem, U-förmigem Maul, das eine Sechskantschraube oder -mutter von der Seite umgreift. Er ist damit das Gegenstück zum geschlossenen Ringschlüssel und eines der ältesten und meistgenutzten Werkzeuge in der Fahrradwerkstatt.
Cycling is one of the most effective and joint-friendly endurance sports available. Whether commuting to work, enjoying a Sunday ride, or cruising through the city on an e-bike, regular cycling is an active investment in your health. This article summarizes...
Heated grips on an e-bike keep your hands warm in cold temperatures, increasing comfort and safety when riding in autumn and winter. They are a particularly useful addition for commuters or frequent riders, allowing them to continue cycling even in...
Linkglide ist eine von Shimano entwickelte Antriebstechnologie für Kassette, Kette und Schaltwerk, die gezielt auf hohe Haltbarkeit und ruhiges Schaltverhalten statt auf minimales Gewicht ausgelegt ist. Sie bildet die technische Basis vieler Shimano CUES-Komponenten und richtet sich vor allem an E-Bikes, Trekkingräder und Alltagsfahrräder mit hoher Kilometerleistung.
A lithium-ion battery (Li-ion battery) is a rechargeable battery used in many modern devices – from smartphones and laptops to e-bikes. Due to its high energy density, low self-discharge, and long lifespan, it is now considered the standard in mobile...
Ohm's law is a fundamental law of electrical engineering. It describes the relationship between voltage , current, and resistance – and is also relevant for understanding e-bike electronics . The formula of Ohm's law Ohm's law states: U = R...
Structure and Function In a classic headset, the fork is guided in the frame via a tapered bearing area. The Overdrive headset expands on this principle: The upper bearing is usually larger in diameter (often from 1 1/8 inches to...
Pedal-by-Wire bezeichnet einen E-Bike-Antrieb ohne mechanische Verbindung zwischen Pedalen und Hinterrad. Statt Kette oder Riemen überträgt ein Kabel die Energie: Du trittst in einen Generator im Tretlager, der Strom erzeugt, und ein Nabenmotor im Hinterrad wandelt diesen Strom wieder in Vortrieb um. Fachlich korrekt heißt dieses Prinzip serieller Hybridantrieb; im Marketing findest Du auch die Begriffe „Bike-by-Wire" oder „kettenloser Antrieb".
A quick-release skewer is a practical locking mechanism on bicycles that allows wheels or seatposts to be attached and detached without tools . The system consists of an axle with a lever, a clamping nut, and an eccentric clamping mechanism...
A reversing ratchet (also called a freewheel ratchet or part of the freewheel mechanism ) is a central component in the rear wheel hub of bicycles. It allows the rear wheel to rotate freely without the pedals turning, while simultaneously...
The car valve , also known as a Schrader valve , is one of the most commonly used valves in the bicycle sector – especially on city bikes, trekking bikes, and many e-bikes. It owes its name to its identical...
Shimano CUES ist eine seit 2023 eingeführte Schaltgruppen-Plattform von Shimano, die mehrere bisher getrennte Einsteiger- und Mittelklasse-Serien – darunter Altus, Acera, Alivio sowie Teile der unteren Deore-Reihe – zu einem einheitlichen System zusammenfasst. Der Name steht für „Contriving Unique Cycling Experience through Synergy" und beschreibt den Grundgedanken: Statt vieler einzelner Serien gibt es nun ein durchgängiges Baukastensystem mit klar abgestuften Ausstattungsniveaus.
Smooth welding refers to a special welding and post-processing technique in bicycle frame construction, in which weld seams are ground and smoothed after the actual welding process. The aim is to make the transitions between the individual frame tubes virtually...
The standing pedal stroke , or "standing pedal stroke," is a cycling technique where the rider stands up from the saddle and pedals while standing. This involves actively using body weight to generate more power at the cranks . The...
Starrlauf bezeichnet einen Fahrradantrieb ohne Freilauf: Das Ritzel ist starr mit der Hinterradnabe verbunden. Solange sich das Hinterrad dreht, drehen sich auch Kette, Kurbel und Pedale mit – ausrollen mit stehenden Pedalen ist unmöglich. Gebräuchlich sind auch die Begriffe starrer Gang, Starrnabe und das englische Fixed Gear; ein Rad mit Starrlauf heißt umgangssprachlich Fixie. Früher war der Ausdruck Ewigtreter verbreitet.
Strava is a globally popular online platform and app for recording, analyzing, and sharing athletic activities such as cycling, running, hiking, or rowing. Strava has become a standard tool, especially among cyclists, for documenting training progress, comparing performances, and connecting...
A Torx key is a tool for tightening and loosening screws with a star-shaped internal profile, the so-called six-lobe drive (ISO 10664). The profile consists of six evenly rounded points that resemble the cross-section of a star – hence the common name T-Star.
Tubeless heißt auf Deutsch schlauchlos: Der Reifen dichtet direkt auf der Felge ab, eine Dichtmilch verschließt kleine Einstiche von selbst. Dieser Eintrag erklärt Bedeutung, Aufbau, die Kürzel TLR und UST, wie Du einen Tubeless-Reifen erkennst und für wen sich das System lohnt.
Ein Ventilkernentferner ist ein kleines Werkzeug, mit dem sich der Ventilkern – also der innere Verschlussmechanismus eines Fahrradventils – herausschrauben lässt. Er ist vor allem bei Tubeless-Systemen unverzichtbar, weil dort Dichtmilch durch das offene Ventil eingefüllt wird, ohne den Reifen zu demontieren.
The walk mode (also known as push assist) is a feature on e-bikes that activates the motor when pushing the bike at a slow speed. Instead of pushing the e-bike – which weighs between 17 and 28 kg depending on the model – without assistance, the motor takes over some of the pushing work. The bike then moves independently at a controlled walking speed, typically a maximum of 6 km/h .
The chainring is a central component of the bicycle drivetrain. It is the sprocket that is directly connected to the crank arms and transmits the rider's power to the rear wheel via the bicycle chain. Chainrings are available in various...
The crank is a central component of the bicycle drivetrain and, together with the pedals and bottom bracket, forms the connection between human muscle power and the bicycle's drive system. The crank converts the applied force into a rotational movement...
Efficiency describes how efficiently energy is converted. It indicates what proportion of the energy input is actually available as usable power . Definition of efficiency Efficiency is expressed as a ratio: Efficiency = Useful energy ÷ Energy input It is...
Ein Nabendynamo sitzt in der Vorderradnabe und erzeugt beim Fahren Strom für das Licht. Dieser Artikel erklärt Funktion, Vor- und Nachteile, den Vergleich mit dem Seitenläuferdynamo, Standlicht, USB-Laden und die Nachrüstung.
The kilowatt-hour (kWh) is a unit of measurement for energy . It indicates how much electrical energy is consumed or stored when a power output of one kilowatt (kW) is used for one hour . What exactly does kilowatt-hour mean?...
The pedal axle is the load-bearing connecting element between the pedal and the crank. It transmits the pedaling force, enables the rotation of the pedal, and is a central safety-relevant component in the bicycle drivetrain. The pedal axle connects the...
Pedal force refers to the force that a rider transfers via the pedals to the crank of a bicycle or e-bike. It is the key factor for propulsion , as it is directly converted into torque at the crank and...
A spoke magnet is a small component that is attached to the spoke of a bicycle and is primarily used in combination with bicycle computers or e-bike displays to measure speed and cadence . How it works The spoke magnet...
A spring washer is a mechanical locking element used in bolted connections to prevent loosening due to vibrations, dynamic loads, or settling. It belongs to the group of locking washers and is frequently used in mechanical engineering, electrical engineering, and...
