Gear 8 Teeth vs Gear 16 Teeth: Which One Do You Need?

Quick answer

Choose the 8-tooth gear (#10928) when you need more speed and less torque, or when you're working in a tight space. Choose the 16-tooth gear (#94925) when you need more torque and slower, more controlled motion. If you're unsure, get one of each and experiment—they're inexpensive and work together in the same builds.

The core trade-off: speed vs torque

In any gear setup, the size of the gear affects how power is delivered. A smaller gear (8 teeth) turns faster but with less turning force, while a larger gear (16 teeth) turns slower but with more force. This is the fundamental trade-off you're choosing between.

Think of it like a bicycle: a small front sprocket makes it easier to pedal uphill but you go slower, while a large front sprocket gives you more speed on flat ground but requires more effort. The same principle applies to the 8-tooth and 16-tooth gears. The 8-tooth gear is your speed gear; the 16-tooth gear is your torque gear.

When to use the 8-tooth gear (#10928)

The 8-tooth gear is ideal for builds where you want faster motion or where space is limited. Because it's smaller, it can fit into tighter spots and can be used to increase the speed of a mechanism when paired with a larger gear.

For example, if you're building a fan or a fast-spinning wheel, the 8-tooth gear can help you achieve higher RPMs. It's also a good choice for driving a larger gear to create a speed increase.

When to use the 16-tooth gear (#94925)

The 16-tooth gear is better for applications that need more torque or slower, more deliberate motion. It's often used to drive wheels or lift mechanisms where you need force rather than speed.

If you're building a vehicle that needs to climb a slope or a crane that lifts a load, the 16-tooth gear will give you the extra torque you need. It can also be used to slow down a fast motor for more controlled movement.

Using them together

The real power comes from combining both gears. By meshing an 8-tooth gear with a 16-tooth gear, you create a gear ratio of 2:1 (or 1:2, depending on which is driving). This lets you trade speed for torque or vice versa.

For example, if the 8-tooth gear drives the 16-tooth gear, the 16-tooth gear will turn at half the speed but with twice the torque. This is useful for driving heavy wheels or lifting objects. Conversely, if the 16-tooth gear drives the 8-tooth gear, the 8-tooth gear will spin twice as fast but with half the torque.

Trade-offs at a glance

• Speed: 8-tooth gear turns faster; 16-tooth gear turns slower. Pick 8-tooth for speed.
• Torque: 16-tooth gear delivers more turning force; 8-tooth gear delivers less. Pick 16-tooth for power.
• Size: 8-tooth gear is smaller and fits tight spaces; 16-tooth gear is larger and may not fit everywhere. Check your build's clearance.

Product facts

• Gear - 16 Teeth - #94925: This replacement part is a 16-tooth gear, identified by part number #94925. It is listed in the Parts category and is supplied as a single gear. The 16-tooth gear provides more torque, making it suitable for heavy-duty or slow-moving builds.
• Gear - 8 Teeth - #10928: Gear - 8 Teeth - #10928 is a replacement part from Circuit Cubes | Tenka Inc. It is listed in the Parts category and is intended for use with compatible builds. The 8-tooth gear is smaller and faster, ideal for speed-focused or space-constrained builds.

Which gear is right for you?

Best for

• Builders who need faster motion (e.g., fans, fast wheels)
• Projects with limited space where a smaller gear is required
• Combining with a 16-tooth gear for a speed increase

Not for

• Applications requiring high torque (e.g., climbing, lifting)
• Builds where you need slow, controlled movement
• Situations where a larger gear is necessary for the mechanism