-Higher sprocket ratio = The rear sprocket has many more teeth than the front sprocket

• Increased Torque: More pulling power, ideal for low-speed applications
• Reduced Top Speed: Higher engine RPM is needed to maintain the same speed, limiting maximum speed.

-Lower sprocket ratio = The rear sprocket has fewer teeth relative to the front sprocket.

• Increased Top Speed: Lower engine RPM at higher speeds, which can achieve faster travel.
• Reduced Torque: Less pulling power, making it harder to climb hills or carry heavy loads

Key Difference

Aspect	Higher Ratio	Lower Ratio
Performance	Torque(Acceleration,Climbing)	Speed (Highway, Racing)
Engine Strain	Higher RPM for a given speed	Lower RPM for a given speed
Terrain Suitability	Steep, uneven, or off-road	Flat, smooth, or highways
Fuel Efficiency	Typically lower (more RPMs needed)	Typically higher (fewer RPMs needed)

Important: Decreasing the ratio too much will cause the bike to loose power and unable to reach top speed, it is not recommended for most bikes to lower the ratio more than the equivalent of -2 teeth at the rear or +1 teeth at the front.