Overview
The RPM Rear A-Arms for Losi Tenacity U4 Lasernut (Black) represent a premium suspension upgrade for one of the most popular RC platforms in the UK market. Whether you're a competitive racer, weekend basher, or someone who demands reliability from their RC car UK setup, these replacement A-arms deliver the durability and performance that serious enthusiasts expect. RPM has engineered these components with strength and durability as their primary goals, resulting in a set of ultra-strong, incredibly durable A-arms that are sure to exceed the demands of both racers and bashers alike.
Suspension geometry is absolutely critical to RC performance, and these RPM A-arms maintain stock geometry settings, making them an easy drop-in replacement for your existing Losi Tenacity suspension. The beauty of this design philosophy is that you can upgrade to superior components without needing to recalibrate your vehicle's camber, caster, and toe angles. Simply remove your worn or damaged stock arms and install these RPM units, and you're ready to get back on the track with minimal fuss. For anyone running a ready to run RC buggy or truck, this is exactly the kind of practical upgrade that extends your vehicle's lifespan and improves performance simultaneously.
RPM's reputation in the RC hobby is built on meticulous engineering and real-world testing, and these Tenacity A-arms are no exception. Manufactured in the USA using RPM's trademark blend of nearly indestructible nylons, these arms represent a significant step up from stock Losi parts. If you're serious about your RC car performance and reliability, the RPM Rear A-Arms are an investment in years of trouble-free operation.
Key Features
- 30° Leading and Trailing Edge Design — RPM Tenacity A-arms feature carefully engineered 30° leading and trailing edges that give each A-arm a slim, aerodynamic shape, helping your vehicle transition smoothly up and over obstacles instead of bluntly ploughing into them, which reduces impact damage and improves overall handling.
- 60% Beefed-Up Hinge Pin Support Diameters — Key areas that required additional strength, such as the outer hinge pin support diameters, have been reinforced by as much as 60%, meaning those less than perfect incidents won't end your day of fun and keeping your A-arms intact through hard landings and crashes.
- Minimal Slop Design — For performance enhancements, RPM has tightened the slop out of the A-arm, creating a much smoother, more consistent platform for reliable camber, caster, and toe angle settings, which translates to better handling consistency lap after lap.
- Stock Geometry Compatibility — Suspension geometry is set to stock settings, making installing a set of RPM A-arms a simple swap with very little needed to be done to get back on the track, eliminating the need for geometry adjustments after installation.
- Sold as a Pair — RPM A-arms for the Losi Tenacity are sold in pairs, ensuring you have complete rear suspension coverage and balanced performance across both sides of your vehicle.
- USA Manufacturing and Premium Materials — These A-arms are moulded in RPM's trademark blend of nearly indestructible nylons and manufactured in the USA, guaranteeing quality control and durability that simply exceeds standard plastic suspension arms.
- Easy Drop-In Replacement — These rear A-arms replace stock Losi part number LOS234017, making identification straightforward and installation quick, whether you're upgrading from a damaged stock part or simply improving your suspension system.
Technical Performance
The RPM Rear A-Arms represent a masterclass in suspension engineering for the ready to run RC buggy and truck market. Built from RPM's nearly indestructible nylon blend, these components have been specifically designed to handle the extreme stresses that modern RC vehicles experience. The 30° leading and trailing edge geometry isn't just about aerodynamics; this carefully calculated angle helps redirect impact forces rather than absorbing them directly, meaning your suspension geometry remains true even after hard crashes. The 60% reinforcement to the hinge pin support diameters addresses the weakest point in most plastic A-arm designs, transforming what is typically a failure point into a virtually unbreakable joint. The reduction in slop throughout the A-arm design creates a much tighter connection to the suspension geometry, which means your camber, caster, and toe angle settings remain consistent throughout your driving session. This precision translates to predictable handling characteristics and improved cornering stability. For UK RC enthusiasts running their vehicles on typical British terrain—from tarmac skid pads to rough outdoor tracks—this level of durability and precision engineering is exactly what separates a vehicle you can rely on from one that constantly needs repairs. The stock geometry setting means there's no learning curve; if your vehicle handled well with the stock Losi arms, it will handle identically with the RPM upgrade, with the bonus of dramatically improved durability and reliability.
What's in the Box
- 1 Pair of RPM Rear A-Arms in Black
- Left and Right arms for complete rear suspension coverage
Compatibility
- Losi Tenacity U4 Lasernut
- Losi Tenacity TT
- Losi Tenacity DB
- Losi Tenacity Pro (discontinued)
- Losi Tenacity Monster Truck (discontinued)
- Losi Tenacity T (discontinued)
- Directly replaces Losi stock part number LOS234017
Frequently Asked Questions
- What RC Tenacity models are these A-arms compatible with? — These RPM Rear A-Arms fit the Losi Tenacity U4 Lasernut, TT, and DB platforms, and they also work with the discontinued Pro, Monster Truck, and T models, making them suitable for a wide range of Tenacity enthusiasts in the UK RC community.
- Will these A-arms fit my Losi Tenacity without geometry adjustment? — Yes, absolutely. RPM has designed these A-arms with stock geometry settings, which means they are a direct replacement for the original Losi parts. You can simply swap them in and get back on the track with zero additional setup or adjustment required, which makes them perfect for busy racers who don't have time for complicated modifications.
- Why are these A-arms more durable than stock Losi parts? — RPM has reinforced the critical failure points by up to 60%, particularly the hinge pin support diameters where suspension forces are concentrated. Combined with RPM's nearly indestructible nylon blend and USA manufacturing standards, these arms can handle impacts and stresses that would destroy stock plastic arms, extending the overall lifespan of your vehicle significantly.
- What part do these replace? — These RPM Rear A-Arms replace Losi stock part number LOS234017, making them an easy identification and ordering process for Tenacity owners.
- Are these suitable for both racing and bashing? — Completely. RPM has engineered these A-arms to exceed the demands of both racers and bashers alike, whether you're competing on UK club tracks or enjoying weekend outdoor running sessions.
- What makes the 30° edge design important? — The 30° leading and trailing edge design gives the A-arms a slim, aerodynamic profile that helps your vehicle transition smoothly up and over obstacles rather than ploughing directly into them, reducing impact damage and improving overall handling characteristics during aggressive driving.
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 RPM REAR A-ARMS LOSI TENACITY U4 LASERNUT BLACK RPM81092 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.
- Product Type: Replacement Rear A-Arms Suspension Component
- Brand: RPM
- Model Number: RPM81092
- Colour: Black
- Compatibility: Losi Tenacity U4 Lasernut, Losi Tenacity TT, Losi Tenacity DB, Losi Tenacity Pro, Losi Tenacity Monster Truck, Losi Tenacity T
- Replaces: Losi stock part LOS234017
- Material: Nearly indestructible nylon blend
- Manufacturing Location: USA
- Design Feature: 30° leading and trailing edges
- Hinge Pin Support Diameter: Reinforced by up to 60%
- Geometry Setting: Stock suspension geometry
- Slop Reduction: Tightened for consistency
- Suspension Type: A-arm (rear)
- Quantity: Sold as a pair (left and right)
- Performance Profile: Designed for both racing and bashing applications
- Installation: Drop-in replacement, no geometry adjustment required
- EAN Code: 672415810927
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.
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- 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.
