The Ultimate Electric Bike: Size And Power Explained

Electric bikes are a rapidly growing mode of transport, with sales and discounts offered by many brands and dealers. They are a fun and efficient way to commute, ride around town, or mountain bike. When purchasing an electric bike, it is crucial to consider the bike's size to ensure comfort, convenience, and safety. Proper sizing depends on the type of bike, such as mountain, road, or hybrid, and the desired riding style, such as upright or aggressive. Frame size is a critical aspect, and measurements like inseam length can help determine the right fit. Electric bikes vary in size, and proper sizing ensures a more enjoyable and longer-lasting riding experience.

Frame size

When it comes to electric bikes, choosing the right frame size is crucial for comfort, efficiency, and safety. If the frame is too large or too small, it can lead to discomfort, poor handling, and even injury. To determine the ideal frame size, you should consider your height, inseam, and body type.

Height is an important factor in determining the appropriate frame size. Taller riders typically require a larger frame, while shorter riders may need a smaller one. However, it's worth noting that body proportions can vary, even among individuals of similar heights. For example, women often have shorter torsos and narrower shoulders than men, which can impact their ideal frame size. Manufacturers often provide sizing charts or fit guides to help customers choose the right frame size based on their height and body measurements.

Inseam length is another critical measurement when selecting a frame size. It determines the distance between the pedal at its lowest point and your foot. The ideal saddle height allows for a slight bend in your knee when pedalling, providing an efficient and comfortable riding posture. To measure your inseam, stand against a wall, and place a notebook or book between your upper thighs as if you were straddling a bike. Then, measure the distance from the top of the notebook to the floor. This measurement will help you determine the appropriate frame size and saddle height.

Standover height is also an important consideration. It refers to the distance between your body and the bike's top tube when you are standing over the frame. A proper standover height ensures that you can straddle the bike comfortably and safely. When choosing an electric mountain bike (e-MTB), pay attention to the standover height to avoid any discomfort while riding on trails or uneven terrain.

Additionally, the frame size can vary among different manufacturers and bike styles. For example, hybrid bikes might be sized as small, medium, large, or extra-large, while some models use inch measurements. MTBs (mountain bikes) are typically measured from the centre of the bottom bracket to the top of the seat tube. Road bikes may also have varying measurements, depending on whether they measure from the centre or the top of the top tube. Therefore, it is essential to refer to the manufacturer's sizing chart and specifications when selecting the appropriate frame size.

Mountain bikes

Electric mountain bikes are heavier than non-motorized bikes, so it's important to consider suspension travel when making a purchase. The longer the travel, the more cushion you'll get when encountering obstacles. Most full-suspension e-MTBs fall in the 150- to 160mm range, which offers a nice balance of increased comfort and improved control for first-time buyers.

In the United States, there are three electric-assist classes for mountain bikes. Class 1 motors kick in when you pedal and stop helping at 20 mph. Class 2 offers pedal assist up to 20 mph but also has a throttle-powered mode that allows users to engage the motor without pedalling. Class 3 is similar to Class 1 but will assist you until you hit 28 mph. It's worth noting that many countries do not allow e-bikes to assist riders beyond 20 mph.

When it comes to motors, electric mountain bikes typically feature mid-drive or rear hub motors. Mid-drive motors are contained in the frame at the bottom of the bike between the pedals, while rear hub motors are built into the rear wheel. Mid-drive motors offer more power and are easier to handle due to the weight distribution, but they tend to be more expensive.

Safety is an important consideration for electric mountain bikes. You'll want to ensure your e-MTB is UL-compliant for safe charging and storage. Additionally, look for quality components like front and rear shocks, drivetrains, brakes, and wheels designed to withstand the force and weight of an electric mountain bike. Hydraulic disc brakes are a common feature.

When choosing an electric mountain bike, consider the terrain you'll be riding and your personal preferences. If you're riding downhill, you might prefer a full-suspension e-MTB for a smoother ride. On the other hand, some riders might opt for a hardtail for its lightweight feel and simplicity.

Road bikes

Electric road bikes, or 'e-road' bikes, are the newest genre of bicycles, with the first commercially available e-road bike, the Xduro Race, released by Haibike in 2014. Today, e-road bikes are designed to be slim, light, and inconspicuous, with the motor and battery tucked away inside the frame. This means that, to the untrained eye, they are often difficult to distinguish from unassisted bicycles.

When choosing an e-road bike, it is important to consider the weight of the bike, as heavier bikes can be challenging to transport and sluggish on the pavement. For example, the Aventure.2, which weighs 77 pounds, is considered bulky and difficult to transport. On the other hand, the lightweight Ride1Up CF Racer 1, weighing just 28 lbs, is a great budget option at $2,195. The Trek Domane+ SLR 6 Pro is another lightweight option, weighing just 27.5 lbs, and offers a sleek look with its battery tucked into the frame.

The power of the motor is another important consideration when choosing an e-road bike. The S-Works Turbo Creo SL, for example, has a peak output of 240W, which is not as powerful as some other e-bikes but is still impressive given its lightweight frame of just 12.3kg. The Bianchi Impulso E-Road has a punchy motor with an impressive range, while the Specialized Turbo Creo 2 Comp provides smooth assistance with up to 50Nm of torque, making climbs and fast rides effortless.

Finally, it is worth considering the range of the e-road bike, or how far it can travel on a single charge. The Lectric XP 3.0 is a fun and affordable option, offering a range of 37.17 miles on a single charge. The Radster Road is another impressive option, with a range of over 30 miles, and comes with a ton of features at a reasonable price.

Battery size

The battery size of an electric bike is an important consideration when purchasing one, as it can impact the overall performance and versatility of the bike. The battery size is typically measured in watt-hours (Wh) and ampere-hours (Ah). Watt-hours represent the total energy a battery can store, while ampere-hours indicate the battery's capacity to provide a certain amount of current. A higher Ah rating generally means a longer ride per charge, but this can also depend on motor usage, road conditions, and weather conditions.

The size of the battery on an electric bike can vary depending on the motor size and the type of riding the bike is used for. For example, a 250-watt motor will typically have a smaller battery than a 500-watt motor. Additionally, if the bike is used for off-road riding or commuting, the battery size may need to be larger to accommodate the extra power required for these activities.

The range of an electric bike is also an important factor to consider when choosing the right battery size. A higher-capacity battery will store more energy and result in extended riding distances on a single charge. Conversely, a lower-capacity battery may limit the range of the bike. The voltage of the battery also plays a role in the range, with a higher voltage generally resulting in more Wh packed into the same size battery.

The weight of the battery is another consideration when choosing the right battery size. Bigger batteries tend to weigh more, which can affect the overall weight and agility of the bike. The design of the bike can also play a role in battery selection, as the placement of the battery can impact the aesthetics and handling of the bike.

When choosing the right battery size for an electric bike, it's important to consider the range, weight, cost, and power requirements that suit your needs. A larger battery can provide more range but may also increase the weight and cost of the bike. Additionally, the charging infrastructure available to the rider can impact the ideal battery size. If a rider has access to a dedicated outlet for charging, a smaller battery may suffice. However, if charging options are limited, a larger battery with an extended range may be more suitable.

Motor wattage

There are several common wattage options available for electric bike motors, including 250 watts, 350 watts, 500 watts, and 750 watts. 250-watt motors are typically found on entry-level electric bikes, offering relatively low power that is efficient in terms of battery consumption. However, these motors may struggle on challenging terrain, such as steep hills or when carrying heavy loads. If you live in a flat area, a 250-watt motor might be sufficient, but if you plan to ride on hilly routes or carry cargo, a higher wattage motor is recommended.

350-watt motors strike a balance between power and efficiency. They provide adequate power for most riders and situations without consuming excessive energy, resulting in longer battery life. 500-watt motors offer more power and can handle steeper hills and heavier loads with ease, but they also consume more energy, and their legality may vary depending on your region. It's important to check the regulatory limitations in your area before opting for a higher wattage motor.

If you're looking for even more power and performance, 750-watt motors are a significant upgrade. These motors deliver ample power to tackle various riding conditions and can be found on electric bikes like the Radster Road and the RadRover 6 Plus. However, it's worth noting that higher wattage motors, such as those above 750 watts, may have stricter regulatory requirements or require special permits in certain regions.

It's important to remember that the wattage rating of an electric bike motor is just one factor influencing its performance. Other factors, such as the controller, battery, drivetrain, and rider's needs, also play a significant role in the overall riding experience. When choosing an electric bike, consider factors like who will be riding it, the intended use, and your budget to determine the ideal motor wattage that suits your specific requirements.

Frequently asked questions