E-bike Project: Finding Torque for 25 kmph Vehicle with 120 kg Gross Weight

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anas@pibeam
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This is my requirement for one of my projects on E-bike.
front wheel drive three wheeler with brushless DC geared motor.
vehicle speed = 25 kmph
Gross weight = 120 kg
front wheel dia = 30 cm
whether 250 Watts motor can able to achieve this requirement?
What equations has to be used to find out the torque required to drive the vehicle on flat road?
someone please help me out..
 
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i have tried some basic formula to find whether the motor suits my requirements..but the answer is not coming
first i tried to find out the motor speed from velocity using
v=2*pi*r*N/60
then with that speed i found out the torque
p=2*pi*N*T/60
then i compared this one with
T=TE*r*RF
TE-Tractive effort
RF-Resistance factor
and P=F*v
F= mu*m*g
i am not sure where i had done the mistake
 
Do you need to use maths?

How much power can a racing cyclist generate? Google it.
 
Here's i given some specification-
  • Spoke to center (STC) technology allows better flex and traction on trails
  • Modern design with super slim profile
  • Industry-leading power-to-weight ratio
  • Power – 500W / 1000W
  • Torque – 25/50 Nm (18/37 lb-ft)
  • Weight – 3.9 kg (8.6 lb)