Z-S1939

Overview

The RC4WD Narrow Stamped Steel Wheel Pin Mount 5-Lug for 1.55" Wheels (Z-S1939) is a precision-engineered hub assembly designed for serious RC scale enthusiasts who demand authentic proportions and professional-grade performance from their RC crawler or scale truck. This product represents a significant upgrade for RC car UK hobbyists looking to achieve a more realistic track width and cleaner scale appearance on their 1.55" wheeled models. Whether you're building a ready to run RC crawling rig or upgrading an existing scale build, these narrow wheel hubs deliver the geometric precision that separates showcase-quality models from ordinary builds.

Manufactured by RC4WD, a recognised leader in ultra-scale RC components, the Z-S1939 hub set is the result of careful engineering to address one of the most visible aspects of RC scale vehicle design — wheel offset. By narrowing the offset by 5.8mm compared to stock hubs, this product delivers a dramatically improved visual profile that transforms how your RC vehicle sits and appears. For UK RC enthusiasts competing in scale events, building display models, or simply demanding the highest standards of authenticity, these hubs are an essential upgrade that makes an immediate visual and functional difference.

The engineering behind this product reflects RC4WD's commitment to scale fidelity. CNC machining from billet aluminium ensures dimensional accuracy and consistent quality across every unit, while the black anodised finish provides both durability and an authentic appearance that complements modern scale truck designs. Each hub weighs just 2.5g, keeping unsprung weight to an absolute minimum — critical for maintaining suspension compliance and traction on technical terrain.

Key Features

• CNC Machined Billet Aluminium Construction — Every hub is precision-machined from solid aluminium billet, ensuring perfect dimensional consistency and structural integrity that won't deform under the stresses of aggressive RC driving or high-speed impacts.
• Black Anodised Finish — The durable anodised coating protects the aluminium from corrosion and wear whilst providing a professional, stealth appearance that enhances the scale authenticity of your build.
• 5-Lug Pin Mount Design for 1.55" Wheels — Purpose-designed to accommodate RC4WD's extensive range of 1.55" stamped steel beadlock wheels, this pin mount system provides secure wheel retention with a clean, scale-correct aesthetic that traditional threaded hubs cannot match.
• Reduces Wheel Offset by 5.8mm — This critical specification narrows the overall track width compared to stock RC4WD hubs, creating a proportionally correct stance that dramatically improves the visual presence of your RC scale truck and enhances handling characteristics on challenging terrain.
• Ultra-Lightweight at 2.5g Each — Keeping rotating mass minimal is essential for responsive handling and authentic suspension behaviour; at just 2.5g per hub, the Z-S1939 minimises unsprung weight without compromising strength or durability.
• Complete Hardware Package Included — RC4WD includes all necessary M2 fasteners (socket cap screws and black nuts) so you can install these hubs immediately without hunting for compatibility-matched hardware.
• Compatible with Eight Premium Wheel Models — The Z-S1939 is engineered specifically to work with RC4WD's Z-W0260, Z-W0258, Z-W0262, Z-W0264, Z-W0281, Z-W0284, Z-W0285, and Z-W0286 wheel models, ensuring perfect fitment and performance.

Technical Performance

The RC4WD Z-S1939 represents the pinnacle of hub design for serious RC scale builders. Machined from billet aluminium rather than cast, these hubs exhibit zero porosity and consistent metallurgical properties that ensure reliability through countless driving sessions. The 22.0mm outer diameter and 6.5mm width are precisely engineered to complement 1.55" wheels, whilst the 4.2mm centre hole diameter accommodates standard RC4WD axle pins. The 5.8mm offset reduction is not arbitrary — this specification brings the overall track width into proper proportion with the vehicle's wheelbase and body dimensions, creating the visual balance that distinguishes scale-quality builds from casual hobby models. At 2.5g per hub, the total weight addition for a full four-hub upgrade remains negligible, yet the performance improvement in suspension response and traction is immediately noticeable. The pin mount system eliminates the need for threaded axle engagement, reducing installation complexity and potential compatibility issues whilst delivering rock-solid wheel retention. The black anodised finish undergoes a rigorous electrochemical process that creates a hard oxide layer, protecting against scratches, dirt ingestion, and corrosion — essential durability features for RC vehicles that frequently operate in challenging off-road environments across the UK and beyond.

What's in the Box

• 4x Wheel Hex Hub Brake Discs
• 20x M2 x 8mm Steel Flat Head Socket Cap Screws
• 20x Regular M2 Black Nuts

Compatibility and Installation Notes

The RC4WD Z-S1939 is designed specifically to narrow the offset of RC4WD stamped steel wheels. Installation is straightforward on RC4WD axles and compatible aftermarket axle systems. However, it is important to note that these hubs are not suggested for use on Axial SCX10 and SCX10 II axles due to fitment differences on the axle threads. If you are using RC4WD hubs on Axial axles, please note that a washer or spacer may be required due to the different thread depth, ensuring proper seating and preventing fastener looseness. The complete hardware package includes sufficient M2 fasteners for a full four-hub installation on a typical RC crawler or scale truck, though you may wish to retain extras for maintenance or future component swaps.

Replacement and Optional Parts

RC4WD designs the Z-S1939 to be part of a modular ecosystem. Should you need replacement fasteners, Steel Flat Head Socket Cap Screws M2 x 8mm (Z-S1259) and Regular M2 Black Nuts (Z-S1144) are available separately. The hubs pair naturally with RC4WD's extensive range of ultimate scale axles, including the Yota II Ultimate Scale Cast Axle (Center Rear) (Z-A0010), Yota Ultimate Scale Cast Axle (Front) (Z-A0058), Yota Ultimate Scale Cast Straight Axle (Rear) (Z-A0061), Yota II Ultimate Scale Cast Axle (Front) (Z-A0080), Yota II Ultimate Scale Cast Axle (Rear) (Z-A0081), and Yota II Ultimate Scale Cast Axle (Center Front) (Z-A0086), allowing you to build a complete, scale-authentic drivetrain.

Frequently Asked Questions

• Will these narrow wheel hubs fit my RC4WD crawler? — The Z-S1939 is compatible with RC4WD axles and most aftermarket scale crawling axle systems. However, they are not recommended for Axial SCX10 and SCX10 II axles without modifications. Check your axle manufacturer before purchasing; if you're using Axial axles, you may need washers or spacers due to thread depth differences.
• How much narrower are these hubs compared to standard RC4WD hubs? — The Z-S1939 reduces wheel offset by exactly 5.8mm compared to RC4WD's stock hub, creating a noticeably narrower track width that dramatically improves the proportional stance and scale appearance of 1.55" wheeled vehicles.
• What wheels are compatible with these hubs? — These 5-lug pin mount hubs are designed specifically for RC4WD's 1.55" stamped steel wheels: models Z-W0260, Z-W0258, Z-W0262, Z-W0264, Z-W0281, Z-W0284, Z-W0285, and Z-W0286. They will not fit other wheel brands or sizes.
• Are all fasteners included? — Yes, the Z-S1939 package includes 20x M2 x 8mm steel flat head socket cap screws and 20x regular M2 black nuts, providing more than enough hardware for a complete four-hub installation with spares for maintenance.
• How much do these hubs weigh? — Each hub weighs just 0.09oz or 2.5 grams, making the full four-hub set extremely lightweight. This minimises unsprung weight and preserves the suspension compliance essential for authentic scale performance.
• Can I use these on Axial SCX10 or SCX10 II vehicles? — These hubs are not suggested for Axial SCX10 and SCX10 II axles due to axle thread fitment differences. On Axial axles, washers or spacers may be required due to thread depth variation, and fitment is not guaranteed.
• What is the visual difference when installed? — The 5.8mm offset reduction creates a proportionally narrower stance that makes your 1.55" wheeled RC vehicle appear more scale-accurate and authentic. The visual transformation is dramatic and immediately noticeable compared to stock hubs.
• Do I need any special tools for installation? — Installation requires only basic hex tools (typically 1.5mm) to tighten the M2 fasteners. No specialised equipment is needed; any RC hobbyist with standard tools can complete the installation.

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 RC4WD NARROW STAMPED STEEL WHEEL PIN MOUNT 5-LUG FOR 1.55" WHEELS Z-S1939 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.