Effective Gear Ratio Calculator

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Driveline

Front Axle and Steering

Race Car Vehicle Dynamics

Suspension Geometry

Vehicle Collision

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Driveline Angular Velocity

Driveline Torque

✖Old Tire Diameter is defined as the original diameter of the tire before replacing it with a newer one.ⓘ Old Tire Diameter [D_old]			+10% -10%
✖New Tire Diameter is defined as the diameter of the tire which replaces the old tire of the vehicle.ⓘ New Tire Diameter [D_new]			+10% -10%
✖Gear Ratio of Transmission is the ratio between the revolutions of the engine crankshaft and the revolutions of the shaft which comes out of the gearbox.ⓘ Gear Ratio of Transmission [i_g]			+10% -10%

✖Effective Gear Ratio is defined as ratio of old tire size to the new tire size and as a result it incorporates the tire size.ⓘ Effective Gear Ratio [Gr_eff]

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Formula

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Effective Gear Ratio

Formula

`"Gr"_{"eff"} = "D"_{"old"}/"D"_{"new"}*"i"_{"g"}`

Example

`"2.743182"="0.710m"/"0.660m"*"2.55"`

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Effective Gear Ratio Solution

STEP 0: Pre-Calculation Summary

Formula Used

Effective Gear Ratio = Old Tire Diameter/New Tire Diameter*Gear Ratio of Transmission
Gr_eff = D_old/D_new*i_g
This formula uses 4 Variables

Variables Used

Effective Gear Ratio - Effective Gear Ratio is defined as ratio of old tire size to the new tire size and as a result it incorporates the tire size.
Old Tire Diameter - (Measured in Meter) - Old Tire Diameter is defined as the original diameter of the tire before replacing it with a newer one.
New Tire Diameter - (Measured in Meter) - New Tire Diameter is defined as the diameter of the tire which replaces the old tire of the vehicle.
Gear Ratio of Transmission - Gear Ratio of Transmission is the ratio between the revolutions of the engine crankshaft and the revolutions of the shaft which comes out of the gearbox.

STEP 1: Convert Input(s) to Base Unit

Old Tire Diameter: 0.71 Meter --> 0.71 Meter No Conversion Required
New Tire Diameter: 0.66 Meter --> 0.66 Meter No Conversion Required
Gear Ratio of Transmission: 2.55 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

Gr_eff = D_old/D_new*i_g --> 0.71/0.66*2.55

Evaluating ... ...

Gr_eff = 2.74318181818182

STEP 3: Convert Result to Output's Unit

2.74318181818182 --> No Conversion Required

FINAL ANSWER

2.74318181818182 ≈ 2.743182 <-- Effective Gear Ratio

(Calculation completed in 00.004 seconds)

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Credits

Created by Syed Adnan

Ramaiah University of Applied Sciences (RUAS), bangalore

Syed Adnan has created this Calculator and 200+ more calculators!

Verified by Anshika Arya

National Institute Of Technology (NIT), Hamirpur

Anshika Arya has verified this Calculator and 2500+ more calculators!

< 14 Driveline Calculators

Angular Acceleration of Driven Shaft

Go Angular Acceleration of Driven Shaft = -Angular Velocity of Driven Shaft^2*cos(Angle between Driving and Driven Shafts)*sin(Angle between Driving and Driven Shafts)^2*sin(2*Angle Rotated by Driven Shaft)/((1-cos(Angle Rotated by Driven Shaft)^2*sin(Angle between Driving and Driven Shafts)^2)^2)

Velocity Ratio of Hooke's Joint

Go Velocity Ratio = cos(Angle between Driving and Driven Shafts)/(1-(cos(Angle Rotated by Driving Shaft))^2*(sin(Angle between Driving and Driven Shafts))^2)

Percentage Gradeability of Vehicle

Go Gradeability of Vehicle = (10200*Torque Generated*Overall Gear Reduction)/(Rolling Radius of Loaded Driving Tire*Gross Vehicle Weight)-Percentage Rolling Resistance

Axial Force of Multiplate Clutch using Uniform Wear Theory

Go Total Axial Load = pi*Pressure of Intensity*Inner Diameter of Friction Disc*(Outer Diameter of Friction Disc-Inner Diameter of Friction Disc)*0.5

Aerodynamic Resistance

Go Aerodynamic Resistance of Vehicle = 0.5*Density of Air*Frontal Area of Vehicle*Cruising Speed of Vehicle^2*Coefficient of Drag Exerted by Flow

Drawbar Pull

Go Drawbar Pull = (Torque Generated*Overall Gear Reduction*1000)/Rolling Radius of Loaded Driving Tire-Rolling Resistance at Wheel

Power Required to Propel Vehicle

Go Power required to Propel a Vehicle = (Total Resistance on Vehicle*Speed of Vehicle in Meter per Second)/Transmission Efficiency of Vehicle

Weight on Rear Axle

Go Weight on Rear Axle = (Total Weight being Distributed of Vehicle*CG Distance from Front Axle)/Wheelbase of Vehicle

Total Resistance on Vehicle

Go Total Resistance on Vehicle = Aerodynamic Resistance of Vehicle+Rolling Resistance at Wheel+Gradient Resistance

Effective Gear Ratio

Go Effective Gear Ratio = Old Tire Diameter/New Tire Diameter*Gear Ratio of Transmission

Weight on Front Axle

Go Weight on Front Axle = Total Weight being Distributed of Vehicle-Weight on Rear Axle

Engine Torque

Go Engine Torque = (9.55*Power required to Propel a Vehicle)/Engine Speed in rpm

Gear Step

Go Gear Step = Preceding Lower Gear Ratio Number/Gear Ratio Number

Final Drive Ratio

Go Final Drive Ratio = Rear Gear Ratio*Overdrive Ratio

Effective Gear Ratio Formula

Effective Gear Ratio = Old Tire Diameter/New Tire Diameter*Gear Ratio of Transmission
Gr_eff = D_old/D_new*i_g

What is gear Ratio?

Gear ratio refers to the ratio of the number of teeth on two interlocking gears. It's a fundamental concept in mechanics and engineering, specifically in the context of gears, which are toothed mechanical components used to transmit motion and power between rotating shafts.

How to Calculate Effective Gear Ratio?

Effective Gear Ratio calculator uses Effective Gear Ratio = Old Tire Diameter/New Tire Diameter*Gear Ratio of Transmission to calculate the Effective Gear Ratio, The Effective gear ratio formula is defined as the ratio of old tire size to the new tire size and as a result it incorporates the tire size. Effective Gear Ratio is denoted by Gr_eff symbol.

How to calculate Effective Gear Ratio using this online calculator? To use this online calculator for Effective Gear Ratio, enter Old Tire Diameter (D_old), New Tire Diameter (D_new) & Gear Ratio of Transmission (i_g) and hit the calculate button. Here is how the Effective Gear Ratio calculation can be explained with given input values -> 2.743182 = 0.71/0.66*2.55.

FAQ

What is Effective Gear Ratio?

The Effective gear ratio formula is defined as the ratio of old tire size to the new tire size and as a result it incorporates the tire size and is represented as Gr_eff = D_old/D_new*i_g or Effective Gear Ratio = Old Tire Diameter/New Tire Diameter*Gear Ratio of Transmission. Old Tire Diameter is defined as the original diameter of the tire before replacing it with a newer one, New Tire Diameter is defined as the diameter of the tire which replaces the old tire of the vehicle & Gear Ratio of Transmission is the ratio between the revolutions of the engine crankshaft and the revolutions of the shaft which comes out of the gearbox.

How to calculate Effective Gear Ratio?

The Effective gear ratio formula is defined as the ratio of old tire size to the new tire size and as a result it incorporates the tire size is calculated using Effective Gear Ratio = Old Tire Diameter/New Tire Diameter*Gear Ratio of Transmission. To calculate Effective Gear Ratio, you need Old Tire Diameter (D_old), New Tire Diameter (D_new) & Gear Ratio of Transmission (i_g). With our tool, you need to enter the respective value for Old Tire Diameter, New Tire Diameter & Gear Ratio of Transmission and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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