Overview
The ARRMA Input Shaft Cup 7x18mm is an essential drivetrain component designed for RC enthusiasts who demand precision engineering and reliability in their RC cars. Whether you're running an ARRMA 1/7 scale trophy truck, street basher, or 1/8 scale high-performance buggy or monster truck, this replacement part ensures your transmission operates at peak efficiency. As a direct OEM replacement part, it maintains the exact tolerances and material specifications that ARRMA engineered into their vehicles, making it the perfect choice for UK RC car owners who refuse to compromise on quality.
If you're a weekend basher, competition driver, or serious RC hobbyist in the UK, you'll appreciate that ARRMA has become synonymous with durability and performance in the RC world. The Input Shaft Cup is a critical component within your vehicle's drivetrain, and choosing genuine ARRMA parts ensures compatibility and longevity. This isn't a generic aftermarket part – it's the exact component specified by ARRMA's engineering team for models ranging from the lightning-fast Limitless 8S speed machine to the aggressive Felony street basher and the all-terrain Mojave desert truck. Keep your RC ready to run at its best with this precision-manufactured replacement.
The Input Shaft Cup serves as a crucial interface within your transmission system, supporting the input shaft and ensuring smooth power delivery from motor to wheels. Over time, through aggressive driving, high-speed runs, or simply the wear that comes with regular use, this component may need replacement. Having a genuine ARRMA spare on hand means you can get back on the track or trail quickly, without waiting for postage from overseas or settling for inferior alternatives.
Key Features
- Super-Strong Steel Construction — This Input Shaft Cup is manufactured from premium steel that delivers exceptional durability and resistance to wear, ensuring it can withstand the extreme forces generated by high-performance brushless motors and aggressive driving styles. Steel construction means long-lasting performance and reliable operation across countless runs and races, protecting your investment in your RC vehicle.
- Precision Manufactured — Every Input Shaft Cup is engineered to exact tolerances by ARRMA, guaranteeing perfect fitment with your vehicle's transmission system. Precision manufacturing ensures smooth operation, minimal play, and optimal power transmission from your brushless motor to the wheels, which is essential for both speed runs and competitive racing where consistency matters.
- Set Screw Threads for Secure Fitting — The inclusion of precision-threaded grub screw holes allows for absolutely secure fastening to the input shaft. The set screw design ensures the cup remains firmly in place during high-stress driving conditions, preventing any slippage or movement that could compromise transmission performance or cause damage to surrounding components.
- Complete with Grub Set Screw — ARRMA includes the essential grub set screw with every Input Shaft Cup, so you have everything needed for immediate installation. This attention to detail means you won't be left searching for matching fasteners or risking installation with incompatible hardware that could lead to failures.
- Direct OEM Replacement — This is the genuine ARRMA part, not an aftermarket interpretation or generic substitute. It's the exact component your RC car was designed with, ensuring perfect compatibility and maintaining the performance characteristics ARRMA engineered into your vehicle from the factory.
Technical Performance
The Input Shaft Cup measures precisely 7mm in diameter by 18mm in length, dimensions that have been carefully engineered by ARRMA to work seamlessly within the transmission housings of their high-performance RC vehicles. The 7x18mm specification places this component in the transmission assembly, where it plays a vital role in supporting the input shaft and maintaining proper drivetrain geometry. Whether you're running a massive 1/7 scale Limitless 8S with its 8-cell LiPo setup capable of extreme speeds, or the increasingly popular 1/7 Felony or Infraction models with their 6S brushless powerplants, or stepping down to the ferocious 1/8 scale Kraton, Typhon, Outcast, Talion, and Notorious variants that deliver stunning acceleration and handling, this component is engineered to handle the loads these machines generate. The super-strong steel construction provides rigidity and durability required by brushless motor applications, where power delivery is instant and forces are concentrated. The precision manufacturing ensures that internal transmission geometry remains correct, maintaining the exacting tolerances that allow ARRMA's renowned transmissions to deliver smooth, efficient power transfer with minimal friction loss. For desert truck users with the Mojave 6S, the component withstands the constant impacts and loads of off-road terrain. The set screw threading and included grub screw ensure installation is straightforward and secure, critical for maintaining transmission integrity during high-speed runs, aggressive off-road bashing, or competitive racing applications.
What's in the Box
- 1x Input Shaft Cup – 7x18mm diameter and length specification
- 1x Grub Set Screw – precision-manufactured fastener for secure installation
Compatibility
The ARRMA Input Shaft Cup 7x18mm is specified as original equipment for an extensive range of ARRMA models, covering both 1/7 scale and 1/8 scale vehicles across multiple categories and performance tiers. Compatible models include the 1/7 Felony 6S AVC 4WD RTR Brushless All-Road Street Bash vehicle, the 1/7 Infraction 6S and Infraction 6S AVC variants designed for street bashing, the 1/7 Limitless 120 8S AVC and Limitless 6S models which represent the pinnacle of speed-focused RC design, and the 1/7 Mojave 6S 4WD RTR Brushless Desert Truck for off-road enthusiasts. In 1/8 scale, it fits the Kraton 6S, Notorious 6S, Outcast 6S and Limited Edition Outcast 6S, the legendary Talion 6S, and the Typhon 6S, covering stunt trucks, speed trucks, and buggies. Always confirm your specific model year and variant before ordering to ensure perfect compatibility.
Why Use a Genuine ARRMA Part?
The drivetrain is the heart of any RC vehicle, and the Input Shaft Cup is a precision component within that system. Choosing genuine ARRMA replacement parts ensures you're installing components engineered and tested by ARRMA's team to work perfectly with your vehicle. Using non-genuine parts risks misalignment, premature wear, reduced efficiency, and potential transmission failure. Genuine ARRMA parts maintain your vehicle's resale value, preserve warranty coverage where applicable, and most importantly, keep your RC performing as intended. For UK RC car owners who've invested in an ARRMA vehicle, using genuine spares is simply the smart choice.
Frequently Asked Questions
- Is the ARRMA Input Shaft Cup 7x18mm a direct replacement for my vehicle? — Yes, this is a genuine ARRMA OEM component designed as a direct replacement for your kit item. Verify compatibility with your specific model by checking the fitment list, which covers 1/7 scale Felony, Infraction, Limitless, and Mojave models as well as 1/8 scale Kraton, Notorious, Outcast, Talion, and Typhon variants. If your model is listed in the compatibility section, it's the perfect match.
- What does the Input Shaft Cup do in my RC transmission? — The Input Shaft Cup is a precision-engineered component that supports the input shaft within your transmission assembly, ensuring proper alignment and smooth power delivery from the motor to the wheels. It maintains critical drivetrain geometry and ensures efficient power transmission, essential for both high-speed performance and durability under load.
- When should I replace my Input Shaft Cup? — You should replace the Input Shaft Cup if you notice excessive backlash in the transmission, grinding noises during acceleration, loss of power delivery efficiency, or if you're performing a transmission rebuild or major service. For competition drivers, some prefer to replace wear items preventatively before major events.
- Can I install the Input Shaft Cup myself? — Installation requires transmission disassembly and reassembly with proper attention to torque specifications and component arrangement. If you're experienced with RC transmission work, you can perform the installation; otherwise, it's recommended to have a qualified RC technician or hobby shop handle the work. The included grub set screw ensures secure fastening once installed.
- Is this suitable for beginners? — The Input Shaft Cup itself is straightforward as a replacement part, but installation requires transmission knowledge and proper tools. Beginners may prefer to purchase this as part of a pre-assembled transmission from an authorised ARRMA dealer or have an experienced hobbyist perform the installation. It's an essential spare to keep on hand, though, as it's easier to learn transmission maintenance than to be stranded during a weekend bashing session.
- Will a genuine ARRMA Input Shaft Cup improve my RC's performance? — As a replacement part for a worn component, it will restore your RC to its original performance specification rather than improve beyond that. However, having a worn Input Shaft Cup replaced with a genuine new one will eliminate transmission drag, improve power delivery efficiency, and restore the handling and acceleration characteristics you experienced when your vehicle was new.
- What material is the Input Shaft Cup made from? — The Input Shaft Cup is manufactured from super-strong steel, chosen for its durability, strength, and resistance to wear. Steel provides the rigidity necessary to maintain precise drivetrain geometry even under the extreme forces generated by brushless motors in high-performance RC vehicles.
- How long does the Input Shaft Cup last? — The lifespan depends on driving style, frequency of use, and maintenance. Aggressive driving, high-speed running, and off-road bashing will wear components faster than casual low-speed driving. Regular maintenance, proper lubrication of the transmission, and avoiding extreme loads will extend the life of all transmission components including the Input Shaft Cup.
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 ARRMA Input Shaft Cup 7x18mm Z-AR310432 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.
