Stepping up from brushed bashing to brushless brilliance, the ARRMA® Big Rock™ 4×4 3S BLX monster truck in 1/10 scale delivers an adrenaline-pumping experience. This ready-to-run (RTR) powerhouse combines legendary ARRMA® toughness with aggressive street truck styling and blistering 50+ mph speed potential. For enthusiasts seeking robust performance and thrilling action, the Arrma Big Rock stands out as an exceptional choice.
Built upon the proven 4×4 BLX platform, the ARRMA Big Rock is engineered with precision aluminum, durable steel, and high-strength composite materials. This combination creates a vehicle design that is both incredibly tough and remarkably easy to maintain. Recent upgrades further enhance its already impressive performance and durability, solidifying the ARRMA Big Rock‘s position as a leader in its class.
DESIGNED FAST and DESIGNED TOUGH, the ARRMA Big Rock 4×4 3S BLX is purpose-built for high-speed bashing and extreme all-terrain adventures. New features amplify its unstoppable nature, including a strengthened chassis and hinge pin plates that are now retained for even greater resilience during hard landings and impacts. The steering system has been refined with increased clearance to prevent stones from hindering performance, ensuring smooth and responsive control even in gravel and rocky terrains. A castellated slipper pad and sliding gear mesh contribute to more reliable power delivery and drivetrain efficiency. Furthermore, longer suspension arms extend the truck’s width by 1.10 inches, enhancing stability and cornering prowess. To minimize friction and maximize durability, rubber-shielded bearings are now incorporated throughout the vehicle, ensuring smooth operation and extended lifespan of critical components.
The ARRMA Big Rock now features the Spektrum™ SLT3™ transmitter and SLR300 receiver, offering a refined and user-friendly control experience. The SLT3™ transmitter is ergonomically sculpted for comfortable, fatigue-free bashing sessions, even during extended use. It boasts a foam-rimmed steering wheel for precise fingertip control, along with an enhanced hand grip and trigger feel, promoting confident and intuitive driving. For new RC enthusiasts, throttle limiting capabilities at 50% or 75% are included, allowing drivers to gradually acclimate to the full speed potential of the ARRMA Big Rock as their skills progress. The versatile SLT3™ transmitter is also compatible with Tactic® SLT™ receivers, enabling operation of other RTR vehicles equipped with this protocol. Adding to its functionality, a third channel is integrated for controlling optional accessories such as lights and winches on compatible models, expanding the customization possibilities of your ARRMA Big Rock.
Powering the ARRMA Big Rock 4×4 3S BLX is a potent brushless system comprised of the ARRMA® BLX100 ESC and the Spektrum™ Firma™ 3200Kv brushless motor. This dynamic pairing delivers explosive torque, rapid acceleration, and impressive top speeds. The drivetrain and chassis are over-engineered to effectively harness and manage the immense power generated by this brushless system, ensuring reliable performance under demanding conditions. The ARRMA Big Rock is built to handle the thrills and spills of high-performance bashing.
ARRMA®’s ingenious modular design philosophy shines in the ARRMA Big Rock, providing unparalleled ease of access to components and simplifying maintenance procedures. The power module, now with improved dirt management features, encapsulates the motor with its ARRMA® heatsink and cooling fan, the motor plate, slipper clutch assembly, and gear cover. This entire power module can be detached from the chassis as a single, integrated unit by removing just a single screw, streamlining maintenance and upgrades. With the power module removed, adjustments to the slipper clutch become readily accessible by simply removing three screws securing the gear cover. Fine-tuning the gear ratio is now more precise than ever, thanks to the power module’s incorporation of a sliding motor mesh design.
The electronics module of the ARRMA Big Rock, a two-piece molding securely screwed to the chassis, houses the waterproof receiver box, servo mount, and ESC tray. The SLR300 receiver is safely enclosed within the receiver box, providing protection from dirt and moisture, ensuring consistent signal integrity and reliable operation in various environments. The compact ESC is conveniently mounted atop the module, granting quick access to the on/off switch, while the servo is mounted to the side. This intelligent design allows for all three components to be removed swiftly and easily as a cohesive unit, further simplifying maintenance and electronic upgrades.
Each differential unit in the ARRMA Big Rock is housed within an innovative yoke design within the differential module. Accessing the front and rear differentials is remarkably straightforward; only eight screws need to be removed to release the front and rear yokes. Subsequently, detaching the power module allows the gearbox cases to be pivoted, providing complete access to the differentials for maintenance, tuning, or upgrades. The ARRMA Big Rock 4×4 3S BLX RTR comes brushless-ready, equipped with robust 37T 1.35mod diffs featuring silicone O-rings for enhanced sealing and performance. The large-diameter gears are engineered to withstand immense torque loads, and internal metal gears have been strategically chosen throughout the drivetrain to ensure unwavering reliability during extreme bashing sessions.
The full-time 4WD transmission of the ARRMA Big Rock utilizes heavy-duty front, rear, and centerline telescopic driveshafts. Unlike traditional dogbones, these driveshafts are designed to remain securely in place even during hard impacts and extreme suspension articulation, preventing loss of drive power and maintaining consistent 4WD performance. A straightforward, dependable, and responsive steering assembly complements the ultra-reliable drive system. This assembly features a servo horn with an integrated servo saver, protecting the servo gears from damage during hard hits and maintaining precise steering response. The ARRMA Big Rock 4×4 3S BLX RTR includes the waterproof Spektrum™ SPMS651 metal-geared digital servo, delivering 15% more torque compared to the ADS-7M servo found in previous versions, resulting in more powerful and responsive steering.
The oil-filled, self-bleeding shocks of the ARRMA Big Rock, now upgraded with silicone O-rings, employ a proven coil-over design for easy maintenance and exceptional handling characteristics across varied terrains. Their innovative rod-end design incorporates a molded-in spring perch, further enhancing overall toughness and impact resistance. Extended height dirt defenders and a closely fitted body effectively minimize the ingress of dirt and debris into the chassis tub, contributing to cleaner operation and reduced maintenance. Robust front and rear bumpers provide crucial defense against impacts, protecting vital components during inevitable collisions and tumbles.
The ARRMA Big Rock 4×4 3S BLX boasts a striking aesthetic, accentuated by matte black front and rear bumpers and wheels. The long, scale Crew Cab body epitomizes street truck style, giving the ARRMA Big Rock a bold and aggressive presence. Equipped with included dBoots® RAGNAROK™ MT tires, the ARRMA Big Rock conquers dirt tracks, trails, and even muddy courses with confidence and grip. An adjustable wheelie bar comes standard, adding another dimension of fun and allowing drivers to execute impressive wheelies and stunts. The ARRMA Big Rock is more than just a monster truck; it’s an invitation to unleash mayhem and experience the thrill of high-performance RC bashing.
