How To Choose The Right Axle Ratio For Your Truck？

Choosing the appropriate rear axle speed ratio is crucial because it significantly impacts a truck's power and fuel economy. This is why truck manufacturers produce vehicles with different rear axle speed ratios.

What is the rear axle speed ratio? It refers to the gear ratio of the main reducer in the truck's driving axle, which is essentially the ratio of the driven gear teeth to the driving gear teeth in the main reducer. For example, if the number of teeth on the driven gear is 43 and the number of teeth on the driving gear is 16, then 43 ÷ 16 = 2.688, resulting in a rear axle speed ratio of 2.688 and a gear ratio of 1/2.688.

Under the same engine speed and gear position, a smaller rear axle speed ratio results in faster vehicle speed, less climbing effort, and lower fuel consumption, while a larger rear axle speed ratio leads to slower speed, greater climbing effort, and higher fuel consumption.

In modern logistics transportation, which primarily involves highways and emphasizes timeliness, trucks equipped with high-horsepower engines can achieve speeds of over 90 km/h on highways with smaller rear axle speed ratios and overdrive gears in the transmission, without needing high engine speeds. On the other hand, trucks frequently operating on mountainous roads may find larger rear axle speed ratios more suitable.

If you still have questions when purchasing a truck, feel free to consult us. Based on your transportation needs, we will recommend the most suitable truck for you.