Overview
The ARRMA Input Shaft Cup Safe-D (ARA310977) is an essential replacement transmission component for ARRMA RC vehicles. This high-quality drivetrain part has been engineered to provide reliable performance and durability for a wide range of ARRMA models, from 1/7 scale monster trucks to 1/8 scale buggies and speed trucks. Whether you're a dedicated basher, weekend racer, or serious RC enthusiast in the UK, this input shaft cup is designed to keep your ARRMA RC car or truck running smoothly when the original component needs replacement.
Built with precision engineering and manufactured from strong, durable steel material, this input shaft cup represents ARRMA's commitment to quality spare parts that genuine owners depend on. The Safe-D design philosophy sets this component apart from standard alternatives, offering enhanced reliability and peace of mind during operation. This is an ideal replacement part for your ARRMA vehicle, whether you're maintaining your ready to run RC or restoring a well-used machine to factory specifications.
The Input Shaft Cup Safe-D is compatible with numerous ARRMA models across multiple scales and vehicle types, making it a versatile spare part to have on hand. From the 1/7 Big Rock, Felony, Fireteam, Infraction, Limitless, and Mojave models to the 1/8 Kraton, Notorious, Outcast, Talion, and Typhon variants, this component is recognised as a standard fitting part across ARRMA's brushless 6S lineup. If you own any ARRMA brushless RC car, truck, or buggy in the UK, keeping a spare input shaft cup in your parts box is a smart investment in uninterrupted driving enjoyment.
Key Features
- ARRMA Safe-D Design — The input gear and drive cup key together, ensuring you still have drive in the event of the attachment screw loosening, providing an extra layer of safety and reliability that standard input cups cannot offer.
- Machined Steel Construction — Manufactured from strong and durable steel material, this input shaft cup is engineered to withstand the demands of high-performance RC driving and aggressive bashing without premature wear or failure.
- Precise Screw Threads — Features precise screw threads for safe and secure fit of the securing set screw, ensuring the component remains firmly seated and won't rattle loose during intense driving sessions.
- Compatible with ARA310976 — Requires the Input Shaft Cup Sleeve (4pcs) model ARA310976 to complete the assembly, allowing for a full drivetrain solution when combined with the appropriate matched input gear.
- Matched Gear System — Designed to be matched with your main differential gear and suitable Safe-D compatible input gear, ensuring optimal meshing and performance characteristics across the transmission system.
- Complete Package Included — Comes with not just the input shaft cup itself, but also a set screw M4 x 6mm, providing everything you need for installation without having to source additional fasteners separately.
Technical Performance
The Input Shaft Cup Safe-D represents ARRMA's engineering excellence in transmission components for their brushless RC lineup. Machined from strong and durable steel, this component has been precision-engineered to deliver consistent performance across the full range of ARRMA 6S models, including their 1/7 scale monster trucks and desert trucks, as well as 1/8 scale speed trucks, stunt trucks, and competition buggies. The safe-D design philosophy is particularly notable, as it creates a mechanical bond between the input gear and drive cup through keying, meaning that even if the attachment screw loosens during operation—something that can happen with vibration and aggressive driving—the gear train will continue to transmit drive to the vehicle. This design feature alone sets the ARRMA Safe-D system apart from conventional input cups found on many other RC vehicles. The precise screw threads ensure the M4 x 6mm set screw seats properly without stripping, maintaining a secure connection that won't come loose over time. As part of ARRMA's transmission system, this input shaft cup works in concert with the input gear and main differential gear, and the component is designed to be matched with these parts for optimal performance. The steel construction provides the durability needed for both casual weekend bashing and more demanding competitive driving in the UK RC community.
What's in the Box
- 1 x Input Shaft Cup (Safe-D)
- 1 x Set Screw M4 x 6mm
What You Need to Complete
- ARA310976 — Input Shaft Cup Sleeve (4pcs) — required component for complete assembly
Compatibility
The ARRMA Input Shaft Cup Safe-D is a standard parts component for an extensive range of ARRMA brushless RC models. It is compatible with the 1/7 BIG ROCK 6S 4X4 RTR Brushless Monster Truck, 1/7 FELONY 6S AVC 4X4 RTR Brushless All-Road Street Bash, 1/7 FIRETEAM 6S 4X4 RTR Brushless Buggy, 1/7 INFRACTION 6S AVC 4X4 RTR Brushless All-Road Street Bash, 1/7 LIMITLESS 6S 4X4 Roller Brushless Street Speed in Clear finish, and 1/7 MOJAVE 6S 4X4 RTR Brushless Desert Truck in multiple variants. For 1/8 scale, compatibility extends to the KRATON 6S 4X4 Roller Brushless Speed Truck in Black, KRATON 6S 4X4 RTR Brushless Speed Truck in standard and multiple versions, KRATON 6S EXB AVC 4X4 RTR Brushless Speed Truck in Black, NOTORIOUS 6S 4X4 RTR Brushless Stunt Truck in standard and multiple versions, OUTCAST 6S 4X4 RTR Brushless Stunt Truck in standard and limited edition finishes, OUTCAST 6S EXB AVC 4X4 RTR Brushless Stunt Truck in Black, TALION 6S 4X4 RTR Brushless Speed Truck in Red/Black, TALION 6S EXB AVC 4X4 RTR Brushless Speed Truck in Black, TYPHON 6S 4X4 RTR Brushless Buggy in Black and other finishes, and TYPHON 6S TLR Tuned 4X4 in multiple RTR and Roller variants with various colour schemes including Pink/Purple and Red/Blue options. If you own any of these models, this is a fitting part you should keep in your spare parts collection.
Frequently Asked Questions
- What does the Safe-D design actually do and why is it better than a standard input cup? — The ARRMA Safe-D design creates a mechanical key bond between the input gear and the drive cup. This means that if the attachment screw ever loosens—which can happen with vibration during aggressive driving or bashing—your vehicle will still have drive because the gear and cup are physically keyed together. With a standard input cup that relies solely on the screw for retention, a loose screw could result in complete loss of drive. This makes Safe-D a genuinely safer and more reliable design for serious RC drivers in the UK.
- Is this suitable for beginners? — This is a replacement transmission component rather than a complete vehicle or system, so it's not really aimed at beginners shopping for their first RC car. However, if you're a beginner who already owns an ARRMA brushless RC model and it has damaged or worn transmission components, this is an excellent OEM replacement part that will restore your vehicle to factory specifications. Beginners maintaining their ARRMA RC vehicles will find this part straightforward to install with basic tools and a manual.
- What else do I need to install this input shaft cup? — The Input Shaft Cup Safe-D comes with the cup itself and the mounting set screw M4 x 6mm, so you have the essential fastener. However, to complete a full input shaft assembly, you will also need the ARA310976 Input Shaft Cup Sleeve (4pcs). You'll also want to ensure you have a compatible input gear matched to your main differential gear for proper meshing and performance. A small amount of thread-locking compound may be beneficial for the set screw to prevent loosening.
- What is the difference between this and other ARRMA transmission components? — The key difference in this input shaft cup is the Safe-D design philosophy. While standard input cups rely entirely on a set screw for retention, this ARRMA Safe-D design uses a mechanical key between the input gear and drive cup. This provides drive retention even if the screw loosens, which is a significant advantage for durability and reliability. Additionally, this component is machined from strong steel material with precise screw threads, ensuring it maintains a secure fit and won't strip or loosen over the lifetime of your RC vehicle.
- Which ARRMA models use this input shaft cup? — This is a standard parts component for ARRMA's complete 6S brushless lineup, including 1/7 scale models like Big Rock, Felony, Fireteam, Infraction, Limitless, and Mojave, as well as 1/8 scale models including Kraton, Notorious, Outcast, Talion, and Typhon in their various RTR, roller, EXB, and TLR tuned configurations. If you own any ARRMA 6S brushless vehicle, this is likely a compatible part for your model.
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 Input Shaft Cup Safe-D 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.
