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The stock plastic horn on your SG90 strips the moment you hit something solid, leaving you with a servo that spins freely and a car that won’t steer. Switching to a 25-tooth (25T) metal arm is the single most effective upgrade you can make, and this guide breaks down the five best options built for that exact spline pattern. You’ll see which ones clamp tight, which ones fit a standard 1/10 chassis, and which budget sets are worth your time.
I’m Min — the founder and writer behind Gadgets Feed. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
You want an arm with sg90 that won’t strip or flex under hard driving, so focus on three things: the material, how it mounts, and how aggressively you plan to run your rig.
Our Picks at a Glance
How To Choose The Best Arm With SG90
Your SG90 uses a 25-tooth output spline, so any arm you buy must match that 25T pattern to grip properly. Beyond that, the choice is about material strength, how the arm locks onto the spline, and the length you need for your steering geometry.
Material: Plastic vs. Aluminum
Plastic arms are cheap and flex under load, which can save your servo gears in a crash but also means sloppy steering feel. Aluminum arms like these are stiffer and transfer every input directly, but they transfer impact force to your servo gears, so they are best paired with a metal-gear servo.
Clamping Style: Single Screw vs. Double Clamp
A standard single-screw horn presses against one flat side of the spline. A double clamping design pinches the arm from both sides around the spline, which spreads the load and resists stripping better under hard steering. For a high-torque setup, the double clamp is the safer bet.
Arm Length and Hole Options
Longer arms give you more steering travel but reduce the servo’s mechanical advantage, meaning the servo works harder. Some kits include arms with multiple mounting holes, like a 16mm and 20mm option, so you can tune the geometry to your chassis and driving style.
Quick Comparison
| Model | Best For | Material | Mounting Style | Weight | Amazon |
|---|---|---|---|---|---|
| REEFS RC V2 25T HD Horn★ Best Overall | High-torque steering durability | Hardened Aluminum | 3-Position Double Clamp | 9.07 g | Amazon |
| Team Associated FT Aluminum Clamping HornPremium Pick | Precision racing fit | Aluminum | Clamping | 4.54 g | Amazon |
| ShareGoo 3Pcs Metal 25T Servo Horn | Multi-position tuning on a budget | Aluminum Alloy | Single Screw | 0.317 oz | Amazon |
| 4PCS Aluminum 25T Servo Arms (TCRC) | Extra-long travel for aircraft | Aluminum | Single Screw | 0.04 kg | Amazon |
| uxcell Plastic Servo Arms 25T | Flexible, gear-saving basher use | Plastic | Single Screw | 0.81 oz | Amazon |
In‑Depth Reviews
1. REEFS RC V2 25T HD Horn Black
Our pick — over 4★ from 50+ verified ratings; the strongest balance of quality and price.
The crash-proof clamp that keeps high-torque steering locked to the spline.
This is the pick for anyone running a beefier servo in a truck or crawler, because the 3-position double clamping design grips the 25T spline from both sides instead of just pressing on one flat. That extra purchase means the arm resists stripping even when you bounce off a rock at full lock. It spans a total length of 29.7mm, giving you a solid lever arm for steering without going overboard on travel.
This REEFS horn survives hard impacts because it is made from hardened aluminum, and the weight proves it — at 9.07 g it is exactly twice as heavy as the Team Associated horn below, so there is substantially more material holding things together. Buyers report the fit is perfect for front and rear applications, and the crowd consensus is that the build quality justifies the price. The universal fit listing covers ATV, Motorcycle, Passenger Car, Truck, and UTV, so you can move it between different chassis without buying a new horn.
You do give up a little weight savings for that ruggedness, and the stiffness means impact energy goes straight into your servo gears rather than flexing. That is the trade-off for any metal arm, but the double clamp does the best job here of keeping the connection solid. The recurring criticism is that a specific unit can feel fragile — treat the clamping screws with care during install and it will hold up.
Why It Holds
- Double clamping spreads load across the spline to resist stripping
- Hardened aluminum rated for high-torque servos
- Universal fit for trucks, crawlers, and cars
The Trade-Off
- Heavier than slim racing horns at 9.07 g
- Stiff metal sends crash force to servo gears
Reach for this if: you run a high-torque servo in a basher or crawler and want maximum clamping grip on the 25T spline.
Look elsewhere if: you are shaving every gram for a light race car — this horn is built heavy on purpose.
2. Team Associated FT Aluminum Clamping Servo Horn 25T
A race-bred clamping horn that weighs almost nothing and fits like factory.
For track days where every ounce of rotating mass matters, this Team Associated horn is the lightweight pick — at 4.54 g it is exactly half the weight of the REEFS horn above, yet it still uses a secure clamping design around the 25T spline (the standard spline size for most servos). The 15.5mm length is a compact, short lever that keeps steering responsive and direct without exaggerating travel, so you get precise turn-in on tight corners. Its dimensions are 3.2 x 2 x 0.36 inches, about 28% more compact than the bulkier REEFS unit, so it tucks neatly into tight chassis layouts where space is scarce.
This is genuine Team Associated factory team (FT) hardware, built to the tolerances racers expect from the brand. It is listed as adjustable and lightweight, and the clamping mechanism means you can position it at any angle before locking down — a real advantage for fine-tuning your steering linkage. For a 1/10 scale electric car or truck, this is the precision-oriented choice.
One honest catch from the fitment side: the horn is not threaded for the ball stud, so you will need to supply your own ball or link hardware. That is a minor step for most builders but worth knowing before you start. The ultra-light weight also means it is not the toughest option for a hard basher, though for its intended purpose it is excellent.
Built for precision: this clamping horn delivers race-grade fit in a package half the weight of the rugged REEFS pick, at the cost of needing your own ball stud.
3. ShareGoo 3Pcs Metal 25T Servo Horn
A three-pack of tunable aluminum horns that give you options for every chassis.
This set gives you three separate 25T aluminum horns with two different hole-center distances to choose from — 16mm and 20mm — so you can adjust your steering geometry to match your car or truck. The M3 threads on the linkage holes mean standard hardware bolts right in, and the aluminum alloy construction is CNC machined for precise sizing. It is a genuinely flexible kit for a 1/8 or 1/10 scale crawler, drift car, or off-road truck.
Compatibility is the strong suit here, with the listing covering Futaba, Savox, Power HD, HSP, and most standard servo motors, including the MG995 and MG996R. At just 0.317 ounces, it is the featherweight of the metal group — a 2.6x gap versus the uxcell plastic set below. Owners found it held up even to a hard hit to the front of the car, which is the real-world test that matters.
The honest limitation is the single-screw mounting and the aluminum softness. A recurring note is that the clamping screw is small and can strip before you get a tight fit, and the soft aluminum can develop play over time. For a temporary repair or a basher that is not raced hard, this is a great value; for aggressive racing, the double-clamp REEFS is the sturdier route.
What You Get
- Three horns with 16mm and 20mm hole options for tuning
- Ultra-light at 0.317 oz for minimal rotating mass
- Broad compatibility with most standard 25T servos
Keep In Mind
- Small clamping screw can strip if over-tightened
- Soft aluminum may develop play in hard racing use
Best for: the budget builder who wants spare horns and adjustable hole positions across multiple vehicles.
Think twice if: you race competitively — the soft metal and small screw are not built for sustained abuse.
4. 4PCS Aluminum 25T Servo Arms (TCRC)
The long-arm set that open up extra aileron and rudder travel for aircraft.
This four-pack of CNC-machined aluminum horns is the one to grab if you are working on a plane or boat and need more throw than your stock arm provides. Owners specifically noted that the extra length delivered more travel than needed for ailerons and rudder, which is exactly what you want when the stock setup feels limited. The 25T spline fits the standard servo motors used across buggies, cars, trucks, and truggies.
At 0.04 kg for the set, these are lightweight and durable, with a fine finish that speaks to the CNC machining. Having four in the pack means you can outfit multiple servos or keep spares on hand for the inevitable crash. It is a solid, no-nonsense value for general RC use.
The weak point reported is the machining tolerance on the spline bore. Some units connect very shallowly with the servo output spline and do not seat all the way down, which raises a question about holding strength under heavy load. For light aircraft control surfaces it works great, but for a high-torque steering application you would want the tighter fit of a clamping horn.
Built for travel: the long arms are perfect for getting maximum aileron and rudder throw, but check the spline fit before trusting it with high torque.
5. uxcell Plastic Servo Arms 25T White
The flexible plastic kit that flexes instead of snapping your servo gears.
Sometimes you do not want the stiffest arm — you want one that gives a little and protects your servo gears in a crash. This uxcell set is exactly that, with 25-tooth spline plastic arms in four different styles so you can match the steering geometry you need. The head holes are 3mm in diameter, fitting the standard linkage hardware on a Futaba-style servo.
At 0.81 ounces, this set is the heaviest of the group — a 2.6x gap versus the featherweight ShareGoo metal horns above — but that mass is plastic, and the trade-off is deliberate. Owners mention these are larger and thicker than the OEM control arms that ship with servos, so you get a more substantial feel than the stock part. They are a solid upgrade for a basher where you would rather replace a cheap arm than a servo.
The obvious limitation is that plastic cannot match the precision feel of aluminum, so you will notice a touch more flex under hard steering. If you are running a high-torque setup, the play can feel sloppy. But for a budget build or a child’s first RC car, this kit is a smart, forgiving choice that keeps your servo alive longer.
The forgiving choice: thick plastic that flexes to absorb crashes and protect servo gears, at the cost of some steering precision.
Understanding the Specs
The 25T Spline
The “25T” refers to the 25 teeth on the servo’s output shaft. Your SG90 and most standard servos use this pattern, so a 25T arm is the universal fit. Always match this number — a 23T or 24T arm will not grip correctly and can slip under load.
Clamping vs. Single Screw
A single-screw horn presses against one side of the spline. A clamping horn wraps around the spline with screws on both sides, distributing force more evenly. For high-torque servos, clamping designs resist stripping far better because the load is spread across more surface area.
FAQ
Will a 25T servo arm fit my SG90 servo?
What is the difference between a servo horn and a servo arm?
Why does my servo arm keep stripping or slipping?
Is aluminum or plastic better for a servo arm?
How do I know which hole to use on a multi-position arm?
Will a 1/10 scale servo arm fit my 1/8 scale car?
Why does my new metal arm have play or wobble?
Can I use a longer servo arm to get more steering travel?
Final Thoughts: The Verdict
Across the board, the arm with sg90 winner is the REEFS RC V2 25T HD Horn because its double clamping design gives you the strongest grip on the spline, which is the whole point of upgrading from plastic. If you want a featherweight racing part, grab the Team Associated FT at half the weight. And for budget builders who want spares and tuning options, the ShareGoo 3-pack is the one to reach for.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of August 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
As an Amazon Associate, Gadgets Feed earns from qualifying purchases. This does not affect which products we feature.