GEPRC SPEEDX2 2105.5 2650KV/3450KV Motor for FPV Drone

Lightweight Cinewhoop and Toothpick FPV Motor Design

At only 21.0g, the SPEEDX2 2105.5 works well as a lightweight FPV motor for cinewhoop and toothpick builds where every gram matters. The flat motor profile and hollow-out rotor design improve heat dissipation, helping the motor stay cooler during extended flights, fast throttle changes, and tight cinematic maneuvers.

N52H Magnet and 12N14P High-Quality Motor Build

Built with N52H arc magnets and a 12N14P configuration, the GEPRC SPEEDX2 2105.5 delivers stable power output, strong magnetic force, and smooth handling for FPV freestyle, cinematic, and long-range flying. The reinforced CNC-machined structure helps improve crash resistance while keeping the motor responsive and efficient.

2650KV and 3450KV FPV Motor Options

Available in 2650KV and 3450KV variants, the motor caters to different flying styles.

- 2650KV: Choose the 2650KV FPV motor option for smoother power delivery, better efficiency, and lightweight 4-5 inch long-range FPV builds.

- 3450KV: Choose the 3450KV FPV motor option for quicker throttle response on 3-4 inch cinewhoops, toothpick drones, and agile short-range FPV setups.

Durable Replacement Motor for 3-5 Inch FPV Drones

The SPEEDX2 2105.5 can be used as a replacement FPV drone motor when the KV, shaft size, mounting pattern, voltage, and propeller size match your existing build. Its 1.5mm shaft and durable motor structure make it a practical choice for many 3 inch, 4 inch, and lightweight 5 inch FPV drones using compatible propellers.

Size and Weight

Specifications

Data Test

Package Include

1x GEPRC SPEEDX2 2105.5 Motor

Buying Guide: GEPRC SPEEDX2 2105.5 2650KV/3450KV Motor 

Lightweight Power for 3–5 Inch FPV Builds

The GEPRC SPEEDX2 2105.5 is a lightweight 21g brushless motor designed for pilots who want a responsive, efficient setup without adding unnecessary weight. With 2650KV and 3450KV options, it covers a wide range of 3–5 inch FPV builds, from compact freestyle and cinewhoops to toothpick and long-range quads. GEPRC specifies the 2650KV version for 2–6S LiPo setups and the 3450KV version for 3–4S.

Its 21mm × 5.5mm stator, N52H ARC magnets, hollow-out bell and high-strength construction are designed to balance fast throttle response, smooth power delivery, heat dissipation and durability.

What Makes the SPEEDX2 2105.5 Different?

The biggest advantage is its low weight-to-performance ratio.

At only 21g per motor, the SPEEDX2 2105.5 is considerably lighter than the larger 2107.5, which weighs 29.5g. That makes it particularly attractive for pilots building lightweight 3–4 inch quads or trying to keep a 4–5 inch long-range build as light as possible.

The motor also uses a hollow-out rotor design to improve airflow around the motor, while the N52H ARC magnets and 12N14P configuration are designed to provide strong and stable power output.

Key Specifications

SPEEDX2 2105.5 has received positive feedback from pilots using it on compact FPV builds.

One verified user running the motor on a 3.5-inch cinewhoop described it as surprisingly smooth and powerful, specifically praising its quiet, smooth running characteristics. Another pilot reported that the motor delivered so much power on a 3.5-inch freestyle build that they reduced the throttle limit to around 60% to gain more usable throttle resolution.

There are also user reports specifically around the 2650KV version on new builds. One pilot noticed vibration and a grinding-like sound from a motor during early bench testing; the discussion highlights an important point for FPV builders: motor behavior should be evaluated after the complete build is assembled and properly configured rather than judging a motor solely from unrestricted bench testing.

What does this mean in the air?

The 2105.5 is best understood as a lightweight, responsive motor rather than a maximum-torque motor. Its lower rotating mass and compact stator make it particularly appealing when agility and overall aircraft weight matter.

2650KV vs. 3450KV: Which One Should You Buy?

This is the most important decision when buying the SPEEDX2 2105.5.

SPEEDX2 2105.5 2650KV

Best for: 4S–6S lightweight builds, long range and balanced performance

The 2650KV version offers a wider battery range and is the more flexible option if you're building different types of FPV quads.

Choose 2650KV if you want:

● More flexibility in battery selection

● A balanced throttle response

● Lightweight 3–4 inch builds

● 4–5 inch toothpick or long-range setups

● A more efficiency-oriented setup

GEPRC officially lists the 2650KV motor for 2–6S LiPo and recommends it for 3–4 inch whoops, 4–5 inch toothpicks and long-range FPV quads.

SPEEDX2 2105.5 3450KV

Best for: 3S–4S lightweight freestyle and high-RPM builds

The 3450KV version is the higher-KV option and is better suited to pilots who want a more aggressive response from a smaller quad.

Choose 3450KV if you want:

● Faster motor RPM

● Snappier throttle response

● 3–4S builds

● Lightweight freestyle

● Compact high-RPM FPV quads

GEPRC specifies the 3450KV version for 3–4S LiPo applications

SPEEDX2 2105.5 vs. SPEEDX2 2107.5 1960KV

If you're deciding between these two motors, don't simply look at the motor size. They are aimed at noticeably different builds.

The 2107.5 weighs 29.5g and has a taller 7.5mm stator. GEPRC positions it specifically for 5-inch freestyle and racing, with 1960KV and 2450KV versions and a recommended 6S 1050–1550mAh LiPo.

GEPRC also describes the 2107.5 as providing smooth throttle control, high efficiency, good heat dissipation and strong durability.

Simply put:

Choose the 2105.5 if weight and agility are your priority.

Choose the 2107.5 1960KV if you're building a conventional 5-inch 6S quad and want more stator volume and torque.

A recent FPV community discussion comparing the 2107.5 with a 2207 also points out that the practical difference between nearby motor sizes can be relatively small once the complete aircraft setup is considered; overall takeoff weight, propeller choice and throttle management can have a major effect on flight characteristics. 

Which SPEEDX2 2105.5 Setup Is Right for You?

Final Verdict: Who Should Buy the SPEEDX2 2105.5?

The GEPRC SPEEDX2 2105.5 is a strong choice for pilots who care about low weight, fast response and efficient power delivery rather than simply chasing the largest motor available.

The 2650KV version is the safer all-around choice if you're building a lightweight 3–4 inch quad, toothpick or long-range setup.

The 3450KV version makes more sense when running 3–4S and looking for a quicker, more aggressive response from a compact build.

If your priority is a traditional 5-inch 6S freestyle quad with more torque and a heavier payload, the SPEEDX2 2107.5 1960KV is the better match.

Recommendations