What is the speed ratio between the engine and the tires?

1 Answers
LeahMarie
07/30/25 12:32am
The engine speed is transmitted to the drive wheels at a 1:1 ratio, the vehicle speed would be too fast with very little torque, making it impossible to drive on the road. The main reduction ratio i is approximately (i=7-8). Engine speed ratio: Idle speed is between 750-950 rpm. For manual transmission city driving, it is generally controlled between 1500-2000 rpm. The engine speed ranges from 1000 to 3500 rpm, with maximum torque output around 3000 rpm, after which it becomes inversely proportional to the speed. The engine speed can be monitored via the tachometer on the vehicle dashboard. Normal driving usually stays below 2000 rpm, depending on the specific vehicle model. Tire speed ratio: Tire specifications include markings such as 205/55R1691V, where "V" represents the tire speed rating.
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