FAQ'S

With minimum effort you should get 40km on a 15Ah Battery and 60km on a 20Ah.The actual distance travelled is dependent on various factors and can be up to 100km

  • The weight of the Bicycle
  • The weight of the cyclist
  • The weight of the goods being carried
  • Your pedalling assistance level
  • The Battery capacity

The range provided was based on minimum effort a 63year old 95Kg male with a bicycle weight of 25Kg and a backpack of 5Kg.

The main reason for using Mid-mount motors and not Hub motors is their ability to leverage the bicycles gears and the different ratios they provide. The effective use of the motors power through the gears ensures optimum battery usage and uphill power.

The Future of E-Bikes is Mid-mount Motors

The amount of energy available is stated in Wh (Watt Hours)

  • 48V 15Ah has 720Wh 
  • 48V 20Ah has 960Wh
  • 36V15 Ah has 540Wh
  • 36V 20Ah has 720Wh

So, a 20Ah 36V Battery has the same energy storage as a 15AH 48V Battery. Dc motors perform better at higher voltages 

The 48V battery is by far a better choice. 48V = more power and distance at the same number of amps

The amount of power provided by the motor is stated in Watts (W)

  • The 250W 36V motor provides 250W at seven amps.(36V*7A)
  • The 500W 48V Motor provides 336W at seven amps. (48V*7A)

It stands to reason the higher the power output the more the energy imparted to the rear wheel = less effort on the uphill’s

Not all bicycles are suitable for conversion to E-BIKES

  • The battery requires a straight mounting bar some curved frames might not be suitable for a frame mounted battery 
  • Standard Mid-mount motors fit through the pedal hole in the frame that is 68mm wide 
  • Hydraulic brakes require modification to fit the brake cut-off switches

We are there to provide you with solutions please E-mail your bicycle picture to info@circulaominuto.com. We will evaluate and advise. 

The gear shift sensor is an essential part of the mid-mount E-Bike conversion

  • Its purpose is to cut the power to the drivetrain during shifts removing the tension on the gears and provide a smooth change over

Your drivetrain can be seriously damaged if the motor is powering the bicycle during shifting

The safety of a Life PO4 battery is better however storage capacity of the cell’s vs the size, affect the weight and size of your Battery

  • The nominal voltage of a Life PO4 cell is 3.3 V The nominal voltage of a Li-ion cell is 3.6V
  • You need 60 X 5A Life PO4 cells to create a 20Ah 49.5V battery vs 52 X 5A Li-Ion cells to create a 46.8V Battery
  • 60X (LiFe Po4) Lithium-ion 5A Phosphate 32mm Diameter cell 70mm weighs 8.4Kg 
  • 52 X lithium-ion cell 4.9A 22mm diameter by 70mm weighs only 3.64Kg
  • A 49.5V Life PO4 battery (cells only no casing bms etc) measures 128mm X 480mm if double stacked it measures 128mm X 256mm  
  • A Li-ion 46.8V Battery (cells only no casing bms etc) measures only 88mm X 286mm 

It’s a no brainer build the safety into the Battery using Li-ion Cells, fuses and a battery management system.

The torque sensor in the motor Requires a predetermined pressure on the pedals to induce power from the battery to the motor. The cadence sensor in the motor depends on the rotation of the pedals to do the same.

  • Some people like the torque sensor and others like the cadence it’s a much of a much it really does not make a significant difference they both have the same objective but the Torque costs more.
  • Our Bafang motors has a cadence sensor
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