Is Tractive Force Affected by the Width of Tires on a Car?

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In summary, the formula for tractive force can be calculated using wheel torque divided by the rolling radius of the wheel and tire. The wheel torque is determined by the torque from the engine, gearbox drive ratios, and final drive ratio. It is important to measure the radius of the tire while mounted on the car with full fuel and a driver, as it will change from its free state. The type of driving, whether straight or turning at speed, also affects the calculation of tractive force and should be considered.
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skt
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Is the formula for tractive force = wheel torque/tyre radius, or wheel torque x tyre radius?
 
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  • #2
T = F x D
 
  • #3
Basically, do you simply take the diameter of the crown wheel and tyre, then proceed to calculate the ratio between the two; therefore giving a reduction in torque?
 
  • #4
Torque = Force x Distance.
(What I wrote above was kind of ambiguous, sorry)

Rearranging for force gives torque / distance.

So in this case it's wheel torque / the rolling radius (from cenre of wheel to outer egde of tyre).

The wheel torque is the torque from the engine * the drive ratios of geabox * final dive ratio.
 
  • #5
see post below in gen pyshics forumn..
Wider tire giving better traction debate! Old Aug15-09, 04:19 AM

also..you must measure radius of the tire..with mounted on the car, with full fuel, driver...
because it will change from free state

thing 2?? are you going straight or plan on turning at speed..see several posts on centifugal force, tire contact, tire friction etc..
 

FAQ: Is Tractive Force Affected by the Width of Tires on a Car?

What is tractive force?

Tractive force is the force that is exerted by a vehicle's wheels on the ground in order to move forward. It is also known as driving force or propulsive force.

How is tractive force calculated?

Tractive force is calculated by multiplying the coefficient of friction (μ) between the wheels and the ground by the weight (W) of the vehicle. The formula is F = μW, where F is the tractive force in Newtons (N).

What factors affect the calculation of tractive force?

The coefficient of friction, weight of the vehicle, and any external forces acting on the vehicle such as air resistance or inclines will affect the calculation of tractive force. Additionally, the type and condition of the vehicle's tires will also impact tractive force.

Why is tractive force important?

Tractive force is important because it determines the ability of a vehicle to move forward. The greater the tractive force, the more forceful the vehicle can be in overcoming any resistance or obstacles.

How can tractive force be increased?

Tractive force can be increased by increasing the weight of the vehicle, improving the coefficient of friction between the wheels and the ground, and reducing any external forces acting against the vehicle such as air resistance. Additionally, using tires with better traction can also increase tractive force.

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