E-Bike Time trial – Transition Bikes PBJ
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Buying advice for an Race & Triathlon Triathlon Time trial
Frame material
Choosing the right frame material for an e-bike time trial bike depends on various factors, including the budget, the desired performance and the rider's personal preferences. Aluminium frames are a cheaper option compared to carbon and still offer good stiffness and strength. They are slightly heavier than carbon frames, but offer solid performance for riders looking to keep a budget in mind. Carbon fibre is the most commonly used frame material for high-end time trial bikes and offers an optimal combination of low weight, high stiffness and excellent vibration damping. Carbon frames often allow for aerodynamic frame geometry and are ideal for riders seeking maximum performance and speed. Titanium frames are a luxury option for time trial bikes due to their unique properties, including high strength, corrosion resistance and a smooth ride feel.
Suspension
E-bike time trial bikes or Time Trial (TT) bikes usually do not have a conventional chassis, as is common on mountain bikes or even road bikes. This is because time trial races and triathlons, for which these bikes were developed, focus on aerodynamics, speed and efficiency. Instead, e-bike time trial bikes concentrate on designing a stiff and light frame. The fork of a time trial bike plays a role in the steering precision and aerodynamic design of the bike. It should be stiff and enable precise steering in order to control the bike well at high speeds.
Wheels
The rims of e-bike time trial bikes often have a special aerodynamic profile that helps to minimise drag and maximise speed. These profiles can be deep and aerodynamically shaped to improve airflow around the bike and reduce drag. Rim width can vary depending on the model, but narrow rims are often used on time trial bikes to minimise drag. Spokes on e-bike time trial bikes can be thin and aerodynamically shaped to further reduce drag. Some models even use special spoke configurations to optimise aerodynamics and maximise stiffness.
Tyres
The tyre size for e-bike time trial bikes usually corresponds to the standard size for road bikes, namely 700 C. This size offers a good balance between rolling resistance, weight and aerodynamics and is ideal for high speeds on flat routes. The tyre width can vary depending on personal preference and the specific requirements of the race. Narrow tyres are often preferred for time trials and triathlons as they can minimise rolling resistance and maximise speed. Tyres with a width between 23 mm and 28 mm are typical for e-bike time trial bikes. The tread of the tyres is usually smooth or slightly profiled to minimise rolling resistance and increase aerodynamic efficiency.
Brakes
As e-bike time trial bikes are designed for maximum aerodynamics, the brakes are often positioned in such a way that they minimise air resistance. Direct mount rim brakes are often found on e-bike time trial bikes as they offer good braking performance and can be designed to be aerodynamic at the same time. They use a cantilever mechanism to press the brake pads onto the rim surface. Although they are less common, disc brakes are also used on some e-bike time trial bikes. They offer excellent braking performance and are effective regardless of the weather conditions.
Battery motor
The Zeitvelo e-bike is equipped with a powerful motor that can provide a typical output of 250 to 750 watts, depending on the model type. These motors are designed to provide adequate support and acceleration for journeys at different time and speed levels. Together with a reliable battery, they provide a constant power supply for longer journeys and optimised performance throughout use.