Shark 21.5 EVO Motor 21.9K

Measured performance and racing character: this is the NSR Shark 21.5 EVO

The Shark 21.5 EVO (reference NSR3041) is NSR's reference motor for regulated classes around the 21.5 winding. With 21,900 rpm and 164 g·cm of torque at 12V, it offers a very balanced power curve: enough push from low speeds and a progressive delivery that facilitates both learning and lap consistency in open or club classes.

Main features

• No-load speed: 21,900 rpm at 12V
• Torque: 164 g·cm at 12V
• Format: Short can
• Winding: 21.5 (regulated class)
• Brand: NSR (reference NSR3041)

Recommended applications

The short can format makes it especially versatile for NSR chassis in sidewinder configuration —motor parallel to the rear axle— and inline —motor in line with the axle, lowering the centre of gravity—. Its 21.5 winding makes it the natural choice for competing in championships that set this standard, from the most common club groups to federated rounds where engine equality ensures that the difference is made by the driver and the car's setup.

It is also interesting for those looking to transition from softer motors without yet reaching the pure competition windings with higher torque. The power delivery is manageable and allows for fine-tuning —braid pressure, tyre hardness, gear ratio— without the motor masking setup errors.

Behaviour and performance

The Shark EVO stands out within the NSR family for its linear character. It is not an explosive motor with a harsh start: it responds well to voltage changes and maintains a controlled operating temperature during long sessions, which extends the lifespan of the braids and reduces the need for frequent interventions. For plastic tracks with medium-wide radius curves, where traction is everything, this balance between torque and speed is especially valued.

Usage recommendations

• Perform an initial run-in at reduced voltage (8-9V) for the first few minutes to properly settle the braids.
• Check the alignment of the pinion with the crown gear before assembly: a misaligned transmission consumes torque and generates unnecessary heat.
• Combine this motor with NSR pinions and crown gears of the appropriate pitch to make the most of its working range.
• If you compete in a regulated class, confirm with the championship organiser that the NSR3041 is homologated in your specific category.

Frequently asked questions

What motor position is the Shark 21.5 EVO compatible with?

As a standard short can motor, it fits both sidewinder and inline configurations, depending on the NSR chassis you use. Check your chassis specifications to confirm the recommended position.

What is the difference between the Shark 21.5 EVO and other NSR motors with higher windings?

Higher winding motors (such as the Shark 46 or similar) offer more torque but are also more demanding on electronics and the track. The 21.5 EVO represents the ideal balance for entering regulated competition or for championships seeking equality among participants.

Are the braids included with the motor?

Yes, the motor comes factory-mounted with its braids. However, having spare NSR braids is a good practice before any race day.

Can I use it on universal track systems (Scalextric, Ninco)?

The motor itself is compatible with any system as long as it is mounted on an appropriate chassis. Compatibility with the track depends on the chassis and the car's guide, not the motor.

What gear ratio does it work best with?

NSR recommends adjusting the pinion/crown gear ratio based on the length and type of track. For circuits with many slow corners, a shorter ratio makes better use of the torque; on fast tracks with long straights, a longer ratio takes advantage of the 21,900 rpm.

The NSR Shark 21.5 EVO motor (NSR3041) is a short can slot car motor delivering 21,900 rpm and 164 g·cm torque at 12V, designed for 21.5 regulated class racing. Compatible with NSR sidewinder and inline chassis configurations, it offers a smooth, consistent power delivery ideal for club racing and championship events. A reliable choice for competitive slot car enthusiasts seeking balance between performance and durability.