Overview
The RC4WD XVD Axle for Bully 2 Competition Crawler Axle (Z-S0521) represents a premium upgrade and replacement solution for serious rock crawler enthusiasts across the UK. Whether you're competing in demanding rock crawling events or pushing your Bully 2-based rig to its limits on technical terrain, these precision-engineered axle shafts deliver the performance and reliability you need. Built from CNC machined, heat-treated steel, the XVD shafts are specifically designed to handle the rigorous demands of competition crawler use, providing both durability and responsive steering control that competition drivers depend upon.
As a dedicated RC car UK retailer, we recognise that crawler enthusiasts require components that can withstand the punishing conditions of competitive rock crawling. The RC4WD XVD Axle set is engineered for exactly this purpose. These shafts offer a tight steering radius with an impressive 50-degree steering angle, allowing you to navigate through narrow gaps and execute the precise manoeuvres that win competitions. Supplied as a complete left and right shaft pair, they serve as both an initial upgrade for those building up their competition rig and a practical replacement option for keeping your Bully 2-based machine running smoothly through extended competition seasons.
RC crawling demands components that can endure constant stress and maintain consistent performance lap after lap. The RC4WD XVD Axle shafts meet these exacting standards with engineering that prioritises strength, precision and predictability. For UK-based crawlers looking to upgrade their Bully 2 Competition Crawler Front Axle (Z-A0012) with components that truly deliver, the Z-S0521 represents an excellent investment in your crawler's performance capabilities.
Key Features
- CNC Machined Steel Construction — Each axle shaft is precision-machined using CNC technology, ensuring tight tolerances and consistent quality that you can rely on during competition. This level of manufacturing precision means each shaft integrates perfectly with your front axle assembly, eliminating play and ensuring predictable steering response when you need it most.
- Heat-Treated for Durability — The steel shafts undergo heat treatment to increase hardness and strength, protecting against the repetitive stress and impact forces that crawler competition imposes. This treatment significantly extends the service life of the components and reduces the risk of shaft failure during demanding rock crawling sessions.
- 50-Degree Steering Angle — The XVD shafts deliver an exceptional 50-degree steering angle, providing the tight turning radius essential for navigating rock gardens and technical sections. This wide steering angle is a competitive advantage, allowing you to thread through obstacles and perform the sharp manoeuvres that separate winners from the rest of the field.
- Complete Left and Right Pair — The Z-S0521 includes both left and right axle shafts, providing everything needed to upgrade your front axle assembly. This paired approach ensures matched performance characteristics across both sides of your crawler.
- Competition-Grade Engineering — Designed specifically for the demands of competition crawler use, these shafts are engineered with the same attention to detail and quality standards that RC4WD brings to all their competition-focused products.
Technical Performance
The RC4WD XVD Axle shafts represent the convergence of precision engineering and durable materials science. Constructed from CNC machined, heat-treated steel, these components deliver the robustness required for competition rock crawling whilst maintaining the tight tolerances necessary for responsive steering control. The 50-degree steering angle is achieved through precision engineering that maximises lock without compromising structural integrity, a critical balance in competition crawling where sharp manoeuvres must be executed repeatedly without failure. Each shaft weighs just 1.94 ounces (55 grams), keeping unsprung weight low whilst maintaining the strength required for the punishment of rock gardens, technical climbs and competition courses. The heat treatment process hardens the steel, increasing resistance to the repetitive stress cycles that occur during extended crawler use, making these shafts suitable for serious competitors who demand reliability through multiple competition runs and practice sessions.
What's in the Box
- 1 × RC4WD XVD Axle for Bully 2 Competition Crawler Axle (Left)
- 1 × RC4WD XVD Axle for Bully 2 Competition Crawler Axle (Right)
Compatibility and Installation
- Fits: Bully 2 Competition Crawler Front Axle (Z-A0012)
- Installation requires removal of existing axle shafts and installation into your front axle assembly
- No additional parts required for installation
Important Usage Notes
- Steering Angle Limits — Over-steering or maximum steering the XVD units will cause damage and failure. Always respect the 50-degree steering angle maximum and avoid aggressive steering inputs that exceed this specification, as doing so will compromise shaft integrity and result in premature failure.
Frequently Asked Questions
- Are the RC4WD XVD Axle shafts suitable for my Bully 2 Competition Crawler? — Yes, the Z-S0521 is specifically engineered for the Bully 2 Competition Crawler Front Axle (Z-A0012). These shafts are direct replacements and upgrades for standard equipment, delivering improved steering response and durability for competition use.
- What makes these axle shafts competition-grade? — The combination of CNC machined precision, heat-treated steel construction and the 50-degree steering angle makes these shafts ideal for competition crawling. The precision manufacturing ensures tight tolerances and predictable performance, whilst the heat treatment increases durability under the stress of competitive use.
- How much do these axle shafts weigh? — Each shaft assembly weighs 1.94 ounces (55 grams) total, keeping unsprung weight minimal whilst maintaining structural strength. This light weight helps improve suspension responsiveness and overall crawler handling.
- What is the maximum steering angle these shafts support? — The RC4WD XVD Axle shafts are rated for a 50-degree steering angle, providing exceptional lock for tight turns and technical sections. It is critical not to exceed this angle, as doing so will damage the shafts and result in failure.
- Are these shafts suitable for beginners? — Whilst the XVD Axles are competition-focused components, they serve as excellent replacements for anyone looking to upgrade their Bully 2 crawler. However, they require proper installation knowledge. We recommend consulting the Bully 2 documentation or seeking assistance from our experienced team to ensure correct installation.
- How do I know if I need to replace my axle shafts? — Signs of worn or damaged axle shafts include excessive play in steering, inconsistent steering response, visible bending or cracking, or repeated steering failures. The RC4WD XVD Axles are robust replacements that will restore your crawler's handling characteristics.
- What is the difference between these XVD shafts and standard axle shafts? — RC4WD's XVD shafts feature precision CNC machining and heat treatment for superior durability and consistency. The 50-degree steering angle is optimised for competition use, and the engineering reflects RC4WD's focus on performance and reliability in demanding crawler applications.
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 XVD AXLE FOR BULLY 2 COMPETITION CRAWLER AXLE Z-S0521 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.
- Brand: RC4WD
- Model Number: Z-S0521
- Product Type: Axle Shaft Pair for Competition Crawler
- Construction Material: CNC Machined Steel
- Heat Treatment: Yes, for durability and strength
- Steering Angle: 50 degrees
- Weight: 1.94 oz / 55g (total pair)
- Included Components: Left axle shaft, Right axle shaft
- Compatibility: Bully 2 Competition Crawler Front Axle (Z-A0012)
- Application: Competition rock crawling
- Barcode: 610373635107
- Installation: Replacement shafts for existing front axle assembly
- Operating Limitation: Do not exceed 50-degree steering angle to avoid damage and failure
We want to make sure your delivery goes smoothly, so here are some important details about our service:
- For orders above £120, we offer delivery to most mainland UK addresses. For orders under £120, we can still deliver to Northern Ireland and the outlying isles, as long as the item can be sent by Royal Mail, weighs less than 30kg, and fits within 61cm × 46cm × 46cm. Some highland and remote areas may carry an extra delivery charge as couriers often apply surcharges in these locations. If you live in one of these areas, feel free to contact us before ordering so we can confirm the delivery options and costs for you.
- Most of our products include delivery in the price. If your order is under £90, a small delivery fee will apply but do not worry this will always be clearly shown at checkout before you complete your purchase.
- Depending on what you choose at checkout, your order will usually be delivered either the next working day or within 2 working days. For next day delivery please place your order before 2:00pm. Orders are dispatched Monday to Friday only. Some items may take a little longer and if that is the case we will always show the expected delivery time on the product page.
- If your order includes items with different dispatch times we will normally wait and send everything together once all items are in stock. If one of the items is going to take a while we will give you the choice either wait for everything to arrive or let us send the available items now and deliver the rest later. It is up to you.
- We use trusted delivery partners to make sure your order gets to you safely and on time. We use DPD for next working day deliveries and Royal Mail for the 2 day option.
- As soon as your order is on its way we will send you a tracking number by email. If you provide your mobile number at checkout we will also send delivery updates straight to your phone so you can keep an eye on progress.
- If a product is marked as "Dispatched within 3 working days" delivery usually takes around 3 to 5 working days from when your order is placed.
- For customers in Inverness and other parts of the Scottish Highlands deliveries can take up to 2 working days even if you select next day delivery as couriers do not currently offer a guaranteed next day service to those areas.
