Overview
Ready to obliterate every speed limit you've ever respected? The 1/7 scale ARRMA® LIMITLESS™ 120 8S BLX doesn't just break records, it shatters them, sweeps up the pieces, and asks what's next. This isn't your casual weekend basher—this king of the speed demons targets drivers who think 100 mph is just the warm-up lap. If you're searching for the fastest production-spec ready to run RC car available in the UK, you've found it.
Straight out of the box, this ready-to-run RC car comes locked and loaded with everything you need to dominate asphalt, embarrass supercars, and leave tyre marks on your memory. Just drop in your choice of 6S or 8S hardcase LiPo and add a charger, and you're holding the keys to officially the fastest production RC ever built. Now you're ready to unleash peak ARRMA speed potential. This latest LIMITLESS evolution doesn't just go fast—it gives you three different ways to send it, making it one of the most versatile high-performance brushless RC cars available for UK enthusiasts.
Factory-assembled with an EXB centre differential and gearing that'll blast you past 70 mph for epic all-road chaos, the LIMITLESS 120 offers genuine flexibility. Want more? Swap in the included high-speed pinion and watch this beast crank past 100 mph like it's cruising to the grocery store. Ready to make physics cry? Install that high-speed pinion with the supplied centre spool and the trim aero package to prepare for face-melting 120+ mph speed runs that'll make you feel bad for all the rest.
Key Features
- 120+ mph top speed capability — This is officially the fastest production-spec ready-to-run RC car on the planet, capable of sustained high-speed running with proper tuning, making it the ultimate choice for speed enthusiasts across the UK.
- Factory-installed Spektrum electronics package — The complete Spektrum ecosystem includes a DX3 2.4GHz transmitter, SR6200A DSMR receiver with AVC technology, Firma 160A Smart V2 ESC, and Firma 4685 1450Kv brushless motor, all factory-assembled and calibrated for immediate performance.
- Waterproof construction throughout — The motor, ESC, and servo are all waterproof-rated, meaning you can blast through wet conditions, puddles, and damp grass without worrying about electronic failure or expensive repairs.
- Three tuning configurations included — The kit ships with optional gears and spool settings that let you dial in 70 mph, 100+ mph, or 120+ mph running, giving you total control over the performance envelope without purchasing additional parts.
- Tunable low-drag aero package — Adjustable wing trim lines let you balance downforce and drag, while the full-width front splitter and large rear diffuser with tuneable inserts give you aerodynamic control that serious speed runners demand.
- Heavy-duty drivetrain engineered for 8S power — EXB differentials, all-metal diff outdrives, and reinforced gearbox internals won't flinch when the throttle hits the floor, keeping this speed machine reliable even under extreme punishment.
- Spektrum Firma 1450Kv motor with dual cooling fans — The high-revving brushless motor produces insane top speeds whilst the heatsink and twin 35mm cooling fans manage heat generation during extended speed runs, extending motor lifespan.
- Spektrum S665 digital steering servo with 277.75 oz-in torque — Metal gear construction and 0.12-second response time at 7.4V ensures sharp, precise steering control even at extreme speeds, with all-steel gears and a 25T output spline for durability.
- 3mm thick 6061-T6 anodised aluminium chassis — The rigid platform provides a solid foundation for high-speed stability, whilst the centre brace adds structural integrity and prevents flex when running at maximum velocity.
- Big bore oil-filled shocks with 4mm diameter shafts — Mounted on black-anodised towers, these suspension components deliver consistent handling and increased durability compared to standard shock designs, absorbing impacts across all road surfaces.
- dBoots Hoons all-road tyres with speed wheels — Specifically designed for extreme all-road action, these 100mm diameter tyres glue to asphalt, short grass, and loose gravel, providing the grip necessary for confident high-speed running.
- AVC (Active Vector Control) technology — The integrated Spektrum AVC system automatically adjusts control inputs to keep the LIMITLESS tracking straight and stable at extreme speeds, preventing unwanted drift and ensuring predictable handling.
- Large battery trays accommodating up to 180×55×70mm — This generous space lets you fit larger capacity batteries whilst maintaining proper weight distribution, supporting extended running times and optimal centre of gravity.
- Safe-D output shaft with 8mm diameter — The pinion safety feature prevents damage to drivetrain components during hard crashes, whilst the larger 8mm shaft diameter adds durability and longevity under extreme driving conditions.
- Throttle limiting feature on DX3 transmitter — Smart drivers can dial power back to 50% or 75% until mastering the beast, providing a progressive learning curve and safer introduction to 120+ mph speeds.
Technical Performance
The ARRMA LIMITLESS 120 represents the pinnacle of production-scale RC speed machine engineering. Powered by the Spektrum Firma 160A Smart V2 ESC rated for both 6S and 8S LiPo batteries, this brushless system delivers the power management necessary for sustained high-speed running. The Spektrum Firma 4685 1450Kv brushless motor is engineered for extreme revolutions, producing the horsepower needed to push past 120 mph with proper gearing and battery configuration. The motor ships with an integrated ARRMA heatsink and dual 35mm cooling fans, ensuring thermal management during extended speed runs. The IC5 connector provides secure power delivery whilst reducing resistance losses. The complete drivetrain features an internal gear ratio of 2.8:1 with a standard spur of 46 teeth and a fitted 21-tooth pinion, delivering a final gear ratio of 6.13:1. The EXB limited slip centre differential uses 42T crown gears and 15T pinion gears in GP9 material, whilst front and rear differentials are filled with silicone oil (front and rear 80k cSt, centre 100k cSt) for optimal performance across varying conditions. The 3mm thick 6061-T6 anodised aluminium chassis provides rigidity without excessive weight, whilst the reinforcing centre brace adds stiffness where it matters. Suspension consists of big bore oil-filled shocks with 4mm diameter shafts and turnbuckles for easy tuning, paired with 6.6 N/mm spring rates front and rear. The Spektrum S665 digital servo delivers 277.75 oz-in (20kg) of torque at 7.4V with full-metal gearing and a lightning-quick 0.12-second response time across 60 degrees. The Spektrum DX3 2.4GHz transmitter operates on DSMR technology with full-range telemetry capabilities and colour-coded decals for easy matching to your vehicle. The SR6200A DSMR receiver integrates AVC technology for active stability control, keeping your speed runs predictable and smooth. Dimensions measure 730mm length, 310mm front width, 312mm rear width, and 165mm height, with a 406mm wheelbase optimised for high-speed stability. Unloaded weight is 5.28kg (11 lbs 10 oz). The entire electronics package is waterproof-rated, protecting against wet conditions without sacrificing performance. This is a true professional-grade, purpose-built speed machine designed for drivers who demand authentic competition-level performance in a ready-to-run package.
What's in the Box
- ARRMA LIMITLESS 120 8S BLX 4×4 Speed Machine RTR (fully assembled and pre-finished)
- Spektrum Firma 160A Smart V2 Waterproof ESC with 6S/8S capability
- Spektrum Firma 4685 1450Kv Brushless Motor
- ARRMA integrated heatsink and dual cooling fans
- Spektrum S665 Waterproof Metal Gear Digital Steering Servo
- Spektrum DX3 Smart 3-channel 2.4GHz transmitter
- Spektrum SR6200A DSMR 6-channel AVC receiver
- dBoots Hoons all-road tyres (mounted on speed wheels)
- Multi-tool and hex wrenches (2.0mm and 2.5mm)
- Instruction manual with assembly guidance
- AA batteries for transmitter (included)
- High-speed pinion gear (extra gearing option included)
- Centre spool for high-speed tuning configuration
What You Need to Complete
- 6S or 8S hardcase LiPo battery pack (dimensions must fit within 180×55×70mm) — recommended Spektrum SMART batteries for smart charging capabilities
- Compatible LiPo charger — Spektrum S1100 G2 1×100W or S2200 G2 2×200W AC Smart Charger recommended
- LiPo charging bag or safety sack for safe battery storage and charging
- Optional: Additional LiPo batteries to extend running sessions
Frequently Asked Questions
- What is the actual top speed of the ARRMA LIMITLESS 120 and how do I achieve 120+ mph? — The LIMITLESS 120 is factory-geared to deliver 70+ mph straight out of the box with the standard configuration. By swapping in the included high-speed pinion, you can exceed 100 mph. To reach the advertised 120+ mph, you'll need to install the high-speed pinion together with the supplied centre spool and trim back the aero package (cutting down the wing). This triple-tuning approach lets you dial in your preferred speed range without buying additional parts.
- Is the LIMITLESS 120 suitable for beginners to RC driving? — No, this is not a beginner's RC car. The LIMITLESS 120 is rated as skill level 5, the highest difficulty rating, because controlling a vehicle capable of 120+ mph requires advanced driving experience and skills. The throttle limiting feature on the DX3 transmitter helps by allowing you to dial power back to 50% or 75%, but this is still an extreme-performance machine designed for experienced drivers who understand RC dynamics and can safely operate high-speed vehicles.
- What battery does the LIMITLESS 120 need and how long will it run? — The LIMITLESS 120 is compatible with 6S or 8S hardcase LiPo batteries only (soft-case batteries are not recommended). Battery dimensions must not exceed 180×55×70mm. Larger capacity batteries in this size window will deliver longer run times—typical run times range from 8-15 minutes depending on driving style and battery capacity. For maximum performance, 8S batteries are recommended as the system is optimised for 8S power delivery. SMART batteries with integrated electronics allow use of compatible smart chargers like the Spektrum S1100 G2 or S2200 G2.
- Is the LIMITLESS 120 waterproof and can I drive it in wet conditions? — Yes, the LIMITLESS 120 features waterproof electronics throughout. The Spektrum Firma 160A ESC, Firma 4685 motor, and S665 servo are all waterproof-rated, meaning you can confidently drive through puddles, wet grass, and damp conditions without risking electrical failure. However, always rinse your RC car with fresh water after exposure to saltwater or muddy conditions, and allow it to dry completely before storage.
- What makes the LIMITLESS 120 faster than other production-spec ready-to-run RC cars? — The LIMITLESS 120 holds the distinction of being officially the fastest production-spec RTR RC car ever built. This is achieved through the combination of 8S power compatibility, the high-performance Spektrum Firma 1450Kv brushless motor, optimised 160A Smart V2 ESC, low-drag aerodynamic tuning, and the ability to swap gearing configurations without modification. The three included gearing options (70 mph, 100+ mph, and 120+ mph) provide flexibility that few production cars can match.
- What is AVC (Active Vector Control) and why does the LIMITLESS 120 need it? — AVC is Spektrum's active stability control system integrated into the SR6200A receiver. At extreme speeds (especially 100+ mph), small steering inputs can cause dramatic handling changes or loss of control. AVC automatically adjusts throttle and brake inputs to counteract oversteer and understeer, keeping the vehicle tracking straight and stable. This technology is essential for safe, predictable handling at 120+ mph and prevents the vehicle from spinning out or becoming uncontrollable.
- Can I upgrade or modify the LIMITLESS 120 for even better performance? — Yes, the LIMITLESS 120 is part of a comprehensive ARRMA ecosystem with numerous upgrade options available. You can upgrade shocks, differentials, motor timing, ESC firmware, transmitter programming, and many other components. However, since this is already a top-tier production model, most upgrades are about customisation rather than dramatic performance gains. Consult ARRMA's option parts list or your local UK RC retailer for compatible upgrade choices.
- How does the tunable aero package work and does it really make a difference? — The aero package includes a full-width front splitter, large rear diffuser with tuneable inserts, and adjustable wing trim lines. When you want maximum downforce for stability and cornering grip, you run the full-height wing. When chasing top speed and minimising drag, you cut the wing down using the provided trim lines. The tunable diffuser inserts let you fine-tune rear downforce independently. At speeds above 100 mph, aerodynamic balance becomes critical—poor aero tuning causes instability, whilst optimal tuning enables confident high-speed running.
- What is the difference between the White/Blue and Red/Black colour options? — Both the White/Blue (C-ARA7816T2) and Red/Black (C-ARA7816T1) LIMITLESS 120 models are mechanically identical with the same performance specifications, electronics, and capabilities. The only difference is the factory-finished body colour scheme. Choose based on your personal preference and which colour scheme appeals to you.
- What warranty does the LIMITLESS 120 come with? — ARRMA includes a 2-year limited warranty covering manufacturing defects and component failures under normal use. This warranty covers electronics, motor, servo, chassis, and structural components. Damage from crashes, improper maintenance, or use outside manufacturer specifications is not covered. Always keep your receipt and documentation for warranty claims.
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 1/7 LIMITLESS 120 8S AVC 4X4 RTR Street Speed, White/Blue C-ARA7816T2 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.
Overview
Ready to obliterate every speed limit you've ever respected? The 1/7 scale ARRMA® LIMITLESS™ 120 8S BLX doesn't just break records, it shatters them, sweeps up the pieces, and asks what's next. This isn't your casual weekend basher—this king of the speed demons targets drivers who think 100 mph is just the warm-up lap. If you're searching for the fastest production-spec ready to run RC car available in the UK, you've found it.
Straight out of the box, this ready-to-run RC car comes locked and loaded with everything you need to dominate asphalt, embarrass supercars, and leave tyre marks on your memory. Just drop in your choice of 6S or 8S hardcase LiPo and add a charger, and you're holding the keys to officially the fastest production RC ever built. Now you're ready to unleash peak ARRMA speed potential. This latest LIMITLESS evolution doesn't just go fast—it gives you three different ways to send it, making it one of the most versatile high-performance brushless RC cars available for UK enthusiasts.
Factory-assembled with an EXB centre differential and gearing that'll blast you past 70 mph for epic all-road chaos, the LIMITLESS 120 offers genuine flexibility. Want more? Swap in the included high-speed pinion and watch this beast crank past 100 mph like it's cruising to the grocery store. Ready to make physics cry? Install that high-speed pinion with the supplied centre spool and the trim aero package to prepare for face-melting 120+ mph speed runs that'll make you feel bad for all the rest.
The ARRMA LIMITLESS 120 represents the pinnacle of production-scale RC speed machine engineering. Powered by the Spektrum Firma 160A Smart V2 ESC rated for both 6S and 8S LiPo batteries, this brushless system delivers the power management necessary for sustained high-speed running. The Spektrum Firma 4685 1450Kv brushless motor is engineered for extreme revolutions, producing the horsepower needed to push past 120 mph with proper gearing and battery configuration. The motor ships with an integrated ARRMA heatsink and dual 35mm cooling fans, ensuring thermal management during extended speed runs. The IC5 connector provides secure power delivery whilst reducing resistance losses. The complete drivetrain features an internal gear ratio of 2.8:1 with a standard spur of 46 teeth and a fitted 21-tooth pinion, delivering a final gear ratio of 6.13:1. The EXB limited slip centre differential uses 42T crown gears and 15T pinion gears in GP9 material, whilst front and rear differentials are filled with silicone oil (front and rear 80k cSt, centre 100k cSt) for optimal performance across varying conditions. The 3mm thick 6061-T6 anodised aluminium chassis provides rigidity without excessive weight, whilst the reinforcing centre brace adds stiffness where it matters. Suspension consists of big bore oil-filled shocks with 4mm diameter shafts and turnbuckles for easy tuning, paired with 6.6 N/mm spring rates front and rear. The Spektrum S665 digital servo delivers 277.75 oz-in (20kg) of torque at 7.4V with full-metal gearing and a lightning-quick 0.12-second response time across 60 degrees. The Spektrum DX3 2.4GHz transmitter operates on DSMR technology with full-range telemetry capabilities and colour-coded decals for easy matching to your vehicle. The SR6200A DSMR receiver integrates AVC technology for active stability control, keeping your speed runs predictable and smooth. Dimensions measure 730mm length, 310mm front width, 312mm rear width, and 165mm height, with a 406mm wheelbase optimised for high-speed stability. Unloaded weight is 5.28kg (11 lbs 10 oz). The entire electronics package is waterproof-rated, protecting against wet conditions without sacrificing performance. This is a true professional-grade, purpose-built speed machine designed for drivers who demand authentic competition-level performance in a ready-to-run package.
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 1/7 LIMITLESS 120 8S AVC 4X4 RTR Street Speed, White/Blue C-ARA7816T2 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.
