Etronix Sport Tuned Modified 21T Brushed RC Motor ET0308

Overview

The Etronix Sport Tuned Modified 21T Brushed Motor (ET0308) represents an excellent upgrade pathway for RC enthusiasts looking to step up from basic stock brushed motors. Whether you're running an RC car UK-wide or tackling crawling challenges, this 540-size motor delivers the balanced performance and reliability that serious hobbyists demand. Built with the philosophy that quality brushed RC motors shouldn't require constant replacement, the Sport Tuned range combines affordable pricing with genuine upgradeable features that simply aren't found on entry-level units.

This 21-turn modified motor sits perfectly in the sweet spot for those seeking a straightforward performance boost without the complexity or expense of brushless systems. The 21T wind provides noticeably quicker acceleration and top-end speed compared to higher-turn stock motors, making it ideal for bashers and weekend racers who want immediate responsiveness from their RC vehicles. With an extensive range spanning from 13T right through to crawler-spec 70T options, the Etronix Sport Tuned series ensures there's a perfectly matched motor for virtually every RC application and driving style you might encounter.

RC Model Shop stocks this motor because it represents genuine value for money in the brushed motor category. The engineering focus on rebuildable components and serviceable wear parts means you're investing in a motor that can be maintained and restored to like-new condition, rather than discarded at the first sign of wear. This philosophy appeals to responsible hobbyists, budget-conscious bashers, and those who understand that the best RC experience comes from equipment you can properly maintain and understand.

Key Features

• Rebuildable Can and Endbell Design — Rather than being sealed units designed for single-use disposal, the motor can and endbell are fully rebuildable, allowing you to service internal components and restore the motor to factory condition without replacement, significantly extending the motor's useful lifespan and offering genuine long-term value.
• Ball Bearings for Smooth Running — Premium ball bearings throughout the motor assembly provide smooth, consistent rotation with minimal friction and drag, delivering better efficiency and longer service intervals compared to basic sintered bushings found on entry-level brushed motors.
• Replaceable Brushes and Springs — Brushes and springs are the primary wear items on any brushed motor, and this design allows you to replace just these components rather than the entire motor when they eventually wear, keeping maintenance costs minimal and downtime short.
• Sport Tuned Modified 21T Wind — The 21-turn armature winding is optimised for sport and moderate racing applications, providing quicker acceleration and higher top speed than stock motors whilst maintaining sufficient torque for realistic driveability across varied terrain.
• Standard 540 Motor Size — This is the most common motor size in RC hobby vehicles, ensuring maximum compatibility with existing RC cars, trucks, crawlers and buggies across nearly all brands and platforms available to UK RC enthusiasts.
• Part of Extensive Etronix Sport Tuned Range — Etronix manufactures this motor as part of a comprehensive lineup spanning 13T through 70T options, meaning you can standardise on the brand for different vehicles whilst maintaining consistent quality and reliability across your collection.

Technical Performance

The Etronix Sport Tuned Modified 21T Brushed Motor is engineered specifically for RC applications demanding straightforward performance upgrades without the learning curve associated with brushless systems. At 540 size with a standard 3.2mm shaft diameter, this motor integrates seamlessly into any RC vehicle designed around conventional brushed motor specifications. The 21-turn armature provides approximately 5000-6500 RPM per volt depending on load conditions, offering noticeably improved acceleration and speed compared to 23T stock motors whilst remaining controllable for drivers of intermediate skill levels. The motor's engineering emphasises reliability and serviceability: ball bearings eliminate the play and wear associated with bushings, whilst the rebuildable can design means you're not constantly replacing the entire assembly when maintenance is required. For applications using 20A ESCs and standard 2S LiPo batteries typical across many RC vehicles, this 21T motor performs excellently as a genuine upgrade from basic brushed units. The brushed design itself, whilst requiring more frequent maintenance than brushless alternatives, offers inherent torque characteristics that many drivers prefer for precise control in crawling or technical terrain. Materials throughout are selected for durability: the copper windings, steel bearing races and machined aluminium components are built to withstand regular use and occasional high-load impacts typical of RC bashers and racers.

What's in the Box

• Etronix Sport Tuned Modified 21T Brushed Motor (ET0308)

What You Need to Complete

• RC vehicle with 540-size motor slot and 3.2mm shaft diameter
• Motor pinion gear (typically 12-17 tooth depending on your specific vehicle)
• 20A or higher brushed-compatible ESC
• 2S LiPo battery pack (recommended) or equivalent NiMH pack
• RC transmitter and receiver matched to your vehicle
• Motor shims and mounting hardware (usually already in your vehicle)

Frequently Asked Questions

• Is this 21T brushed motor suitable for beginners and casual bashers? — Absolutely. The Sport Tuned range is specifically designed as a practical upgrade from basic stock motors, offering noticeably better performance without introducing the complexity of brushless systems. The 21T wind is quick enough to be exciting but manageable for drivers developing their skills. The rebuildable design and replaceable wear parts also make this motor an excellent choice for learning proper RC maintenance, as beginners can service and understand the internal mechanisms themselves.
• What is the difference between this 21T motor and the Tamiya Sport Tuned 23T motor? — The Etronix 21T has fewer turns than the Tamiya 23T, meaning it will spin faster and produce higher RPM for the same voltage. This makes the 21T noticeably quicker in acceleration and top speed, whilst the 23T offers marginally more torque. For sport driving and general bashing, the 21T provides more excitement; for crawler work or technical terrain, the higher-turn alternatives are preferable.
• Will this motor fit in my FTX Outlaw brushed vehicle? — Yes, FTX vehicles using brushed motors typically accept standard 540-size motors with 3.2mm shaft diameter, which is exactly what this Etronix motor provides. This applies to other FTX models with brushed setups as well, making it an ideal drop-in upgrade from whatever motor your vehicle came with originally.
• What battery and ESC specifications do I need for this motor? — This motor is designed to work with 20A or higher brushed-compatible ESCs and pairs excellently with 2S LiPo battery packs. The 12AWG wiring specification is recommended for optimal power delivery, ensuring the ESC can supply sufficient current without excessive voltage drop. Standard 2S LiPo batteries (7.4V nominal) are ideal; NiMH packs will also work but deliver noticeably less performance due to lower voltage.
• How does the rebuildable design save money compared to disposable motors? — Rather than replacing the entire motor when brushes wear out (typically after 10-20 hours of use), you simply purchase replacement brush and spring kits, which cost a fraction of a new motor. The rebuildable can and endbell design means you can fully disassemble, clean, inspect and reassemble the motor, often restoring performance to factory condition. Over a season of regular driving, these savings become substantial.
• Is this motor suitable for the Tamiya Racing Fighter? — Yes, Tamiya vehicles using standard 540-size brushed motors will accommodate this Etronix motor as a direct replacement, though you should verify your specific model uses a 3.2mm shaft. The Racing Fighter and similar Tamiya models are excellent candidates for this performance upgrade.
• What is the actual motor can diameter and does it fit standard mounts? — This is a standard 540-size motor with a 36mm diameter can, which is the specification used across virtually all mainstream RC vehicles worldwide. Mounting is therefore straightforward — if your vehicle originally had a brushed motor, this will fit the existing mounts and brackets without modification.

Why Buy from RC Model Shop?

RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the ETRONIX SPORT TUNED MODIFIED 21T BRUSHED MOTOR ET0308 today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.