The speed of an electric motor is determined by its voltage and the size of the wheels and tires. For a 48-volt bike a fully charged 54-volt motor will spin fast enough to reach a top speed of about 35 miles per hour. A 60-volt system for example would be needed for a top speed of 42 miles per hour. Therefore if a 36-volt bike can only reach 25 miles per hour it should be driven at that speed. Remember that top speed also depends on the current voltage of the battery. A bike might be able to reach 35 miles per hour with a fully charged 48-volt battery at 54.6 volts but when the voltage drops to 50 effectively 48 volts it will only reach 30 miles per hour. If your 48-volt bike can only reach 20 miles per hour its worth asking if you can adjust the speed. Finally one more thing to keep in mind: modern electric bikes dont have magic wires that can be cut or removed. Everything depends on the display settings and parameters and whether the manufacturer allows users to change these settings is up to you.
Too many people ask how to drive fast… Ive never seen anyone ask how to stop safely Joking aside if you want to scratch an itch thats fine but make sure your brake system is functioning properly. If youre unsure keep researching until you are.
There seems to be a common misconception that electric bikes have speed limiters meaning that if they can be disengaged they can go much faster. However this is generally incorrect. Manufacturers who sell electric bikes at US Class II legal speed limits are required to limit the top speed to 20 mph 32 kmh which is why speed limiters are installed. However since most electric bikes are never driven faster than 20 mph 32 kmh theres no point in installing a system that allows them to go 30 mph 48 kmh. Manufacturers will likely install batteries controllers and motors that allow smaller riders to ride at 20 mph 32 kmh on flat surfaces.
Everyone who rides an electric bike wants to go 30-40 miles per hour 48-64 kmh but the fastest I can go on a road bike on flat ground is 25 miles per hour 40 kmh… Miles 60-64 kmh is really scary… Its really dangerous to be protected only by a foam helmet and a Lycra helmet with a contact area of 14 inch 6.3 cm by 2 inches 5 cm with the road. The idea of electric bikes is great but I agree with classifying them as motorcycles and mopeds. Im investigating electric doping and motor doping in competitive cycling.
This is generally correct but the mechanism you describe is a bit questionable. The limiting factor for a particular motor is its current handling capacity. A particular motor and wire size have a maximum current capacity. Exceeding this capacity will cause the motor to overheat burn out. Power equals voltage × current. In other words if the maximum current is 10 amps a 36V battery would have a maximum output of 360 watts and a 48V battery would have a maximum output of 480 watts. However nothing prevents a motor with a current rating of 20 amps from delivering twice as much power at any given voltage. The larger the current capacitance the larger the windings the more heat the motor will dissipate and ultimately the larger the motor becomes. However I dont necessarily agree with the statement You need a 60V system to drive 42 mph about 64 kmh.
Unless you have a custom controller with a weak field function top speed is almost always limited by the battery voltage. At 48V its typically limited to about 35 mph and sometimes even higher.
Most of the people asking this question have no experience with electric bikes and what youre saying is completely incomprehensible to them. They dont care and have no desire to learn.
Just tell them to add a turbo and a blow-off valve gg ez
Exactly. I have a 1000-watt 48-volt bike and its top speed is about 35 miles per hour. I cant expect it to go any faster than that.
If you want to go fast buy a moped.
The rotational speed of an electric motor depends on the motor voltage and the size of the wheels and tires. Think about it however you want. The rotational speed is determined by the motors structure the input power voltage and frequency and the load.
The top speed of an electric bike is around 25 miles per hour. Anything above that is like a moped.
This makes absolutely no electrical sense. Theres no inherent speed limiter based on voltage. The limitation is mechanicalphysical. Top speed is limited by the systems gear ratio bike and wind resistance and tire resistance. Theres also a very high software limit controllers have a programmed top-speed cutoff and motor assistance stops when a threshold is exceeded. However voltage plays no role in this. Changing gear ratios increases speed. Switching to slick tires increases speed. Sitting in a more aerodynamic position increases speed. Resetting the bikes firmware increases speed. Its astonishing how little people here know about basic electric motors. Its even more absurd that they spout such inaccurate and completely illogicalnonsensical statements. Im still scratching my head at the thought of voltage limiting top speed. Lower power which is the product of voltage and amperage so looking at voltage alone only gives you half the answer obviously slows down speed but beyond that its meaningless. Most electric motors are voltage-regulated. Its true. You can slow down by lowering the voltage. Youll certainly get more power at full charge. However how fast you can go at full speed isnt necessarily related to voltage. Its easy to see examples of 36V e-bikes being faster than 48V ones. The main kick is actually the amperage. Higher voltage designs typically produce the same power at lower amperage. For example when running its the amperage not the voltage that kills you. The PAS level is controlled by amperage not voltage. At lower PAS levels the amperage cutoff will limit the amperage to a lower amperage than the higher PAS setting but the voltage remains the same. My 48V bike allows you to adjust the maximum amperage in the firmware settings. The default is 22A 1000W strong but you can increase it up to 36A. That would almost double the output to around 1700W. However motorcycles have physical limitations. The motors rated power isnt very high and while it might initially be more powerful it will almost certainly overheat and fail. The chain could snap and the battery could be damaged. Still if the top speed limit were removed until everything breaks down the top speed would certainly be higher than the current 50 kmh. However my system remains a 48V system. Anyway I recommend ignoring the ridiculous talk and learning the basics of electricity.