MXLR POM Spur Gear 64DP/ 72T

CNC-milled, high-precision and smooth-running main gears made of POM - with marking of the number of teeth.

Standard 3-hole mounting - perfect for most 1:12 PanCars and touring cars.

3.0mm width - with the option of a 0.4mm recess for offset mounting.

This gear is particularly interesting for today's stock engines on 1:12 chassis.

The right rollout is no longer a problem.

MAX-12-072 contains:

1x main gear

1️⃣ What is the total reduction ratio?

The total reduction ratio describes how often the motor must rotate so that the wheels rotate once. It results from the interaction of:

• Motor pinion (Pinion Gear): Sits directly on the motor.

• Spur gear: is located on the center shaft or the differential.

• Differential reduction (if available, usually integrated in the gearbox).

The formula is basically:

Total transmission ratio=(main gear motor pinion)×differential reduction ratio\text{Gesamtübersetzung} = \left(\frac{\text{Hauptzahnrad}}{\text{Motorritzel}}\right) \times \text{Differenzialuntersetzung}Totalu¨translation=(Motor pinionMain gear)×Differential reduction

2️⃣ Influence of pinion and main gear

• Larger pinion (more teeth) → less reduction → higher speed, less torque, higher motor temperature.

• Smaller pinion → more reduction → more torque, lower top speed, engine runs cooler.

• Larger main gear → more reduction → more torque.

• Smaller main gear → less reduction → more speed.

3️⃣ Example calculation

• Motor pinion = 20 teeth

• Main gear = 80 teeth

• Differential reduction = 2.6 (assumed)

8020=4\frac{80}{20} = 42080=4 $$4\times 2.6=10.4$$

→ This means: The motor rotates 10.4 times so that the wheels rotate  1time 

4️⃣ Practical effects

• Smaller pinion or larger main gear → better for offroad, crawlers, high torque.

• Larger pinion or smaller main gear → better for on-road, speed runs, high speed.

5️⃣ Important tip

Alwayspay attention to motor and controller temperature when changing pinion/main gear - too little gear reduction (too fast setup) causes the motor to overheat quickly.