The front hub is the centre of the front wheel where the rotation mechanism is. The spokes are attached to the hub, and hold the rim of the wheel in place. e-bike front hubs are available in many different versions in variations such as electric motor hubs and standard hubs. These variations are available in versions, with, for example brackets for disc or drum brakes.
Bicycle valves are a subject that tend to cause a certain amount of confusion, so it can be useful to know what type of valve you have before replacing an inner tube. There are three main types. Presta (racer valve), Schrader (car-type valve), Dunlop (Woods valve). Presta valves tend to be used on more advanced road bikes that have a high tyre pressure. They’re also the easiest ones to pump by hand. The valve core can be replaced on some Presta valves. They can be pumped using the same type of pump as for the Dunlop valve. However, they cannot be pumped with normal car pumps, so you can’t simply cycle into a petrol station to inflate your tyres. Adapters are available to solve this problem, but you need to remember to carry one with you. You can change from Presta to Dunlop or Schrader valves if the rims are sufficiently wide to enlarge the hole. The Dunlop valve is the type that used to be used on most bicycles. If you’re old enough, you probably remember the valve rubber that sat over the core – the little piece of rubber hose that tended to dry out and crack after a while. Valve rubbers used to be included in all bicycle repair kits. Then valve cores with valve rubbers were replaced by the maintenance-free type we have today which has a little ball as a non-return valve. The valve core can be replaced. They can be pumped using the same type of pump as for the Presta valve. Schrader valves are the type used on cars, so it’s easy to find a pump if you need one, for example at a petrol station. The valve core can be replaced. These are common on mountain bikes, but also on “normal” bicycles. You can replace a Schrader valve with a Dunlop valve, but if you want to change to a Presta valve you need a small adapter to reduce the size of the hole in the rim.
Bike speed with assistnace
Pedal assist has a maximum speed of 25 km/h, which is in line with EU regulations on e-bikes. Of course you can always cycle faster than 25 km/h, but the motor won’t provide pedal assist.
How an e-bike’s motor provides pedal assist is determined by factors including the type of sensor on the e-bike. Pressure sensors feel how hard you’re pedalling, while cadence sensors keep track of how quickly the pedal spindles are rotating.
Bicycle tyres are available with different sizes, patterns, colours and characteristics. Studded tyres are tyres suitable for winter cycling and have studs in them to increase grip on icy roads.
Bicycle wheels come in many different sizes. Everything from 7 to 29 inches.
The rear hub is the centre of the back wheel where the rotation mechanism is. The spokes are attached to the hub, and hold the rim of the wheel in place. E-bike rear hubs are available in many different versions in variations such as gear hubs, electric motor hubs and standard hubs. All of these variations are available in versions with, for example, a bracket for disc brakes or drum brakes and a bracket for the cassette or freewheel system.
The most common types of e-bike are: standard e-bike, sport e-bike, compact e-bike, folding e-bike, cargo e-bike, and e-mountain bike (e-mtb). Standard e-bikes can vary depending on where in the world you are. On the Nordic market, the term refers to an e-bike with high comfort levels in the form of an upright and comfortable riding position, easily controlled gear system and encapsulated gears, and equipped with components such as a closed chain guard, luggage carrier, basket and lighting. Sport e-bikes tend to have a more angled riding position, with straighter handlebars. The specifications for electric sport bikes generally include characteristics such as externally mounted gear systems and suspension forks. A compact e-bike is an e-bike with smaller wheels and frame, which means that it takes up less storage space. A folding e-bike has a mechanism on the frame allowing it to be folded for storage or transport. Cargo e-bikes are equipped with a large carrying area in the form of a platform or box, making it possible to transport children or large amounts of luggage. E-mountain bikes (e-mtbs) are a development of standard mountain bikes, equipped with an electric motor system. Just like their namesake, they’re used for mountain biking.
Just like normal bikes, e-bikes can be equipped with either a rigid front fork or a front suspension fork. Rigid front forks are often made from materials such as aluminium, steel and carbon fibre. Front suspension forks are available with spring suspension or air suspension.
Bicycle frames are divided into several different categories. High step or diamond frames have the top tube high up. Low step or step-through frames have the top tube low down. There are also bicycles with folding frames. Cycle frames are also divided into whether or not they have suspension. A hardtail frame is one where the rear part of the frame is rigid. A full suspension (FS) frame has suspension in the rear part of the frame.