RPM Front A-Arms for Losi Tenacity U4 Lasernut Suspension Upgrade Black RPM81662

Overview

The RPM Front A-Arms for Losi Tenacity U4 Lasernut represent a significant upgrade over stock suspension components for one of the most capable short course trucks available in the RC hobby market today. Designed with strength and durability as the primary engineering goals, these front A-arms deliver the ultra-strong, incredibly durable performance that both racers and bashers demand from their RC equipment. Whether you're competing in UK RC competitions or simply enjoying weekend bashing sessions, these RPM A-arms will transform your Losi Tenacity platform with improved handling characteristics and dramatically enhanced durability.

RPM has engineered these A-arms using a sophisticated 30° leading and trailing edge design that creates a slim, aerodynamic profile whilst fundamentally changing how your RC truck interacts with the terrain. Rather than bluntly ploughing into obstacles, the 30° geometry helps the A-arms transition smoothly up and over objects, improving both control and survival rate during aggressive driving. This attention to aerodynamic detail combined with raw strength makes these suspension components ideal for serious RC enthusiasts in the UK who refuse to compromise on performance or reliability.

What sets RPM apart in the competitive world of RC car parts is their commitment to precision engineering and American manufacturing. These front A-arms are moulded from RPM's trademark blend of nearly indestructible nylons, engineered to withstand the demands of both track racing and off-road bashing. The result is a suspension upgrade that will handle everything your Losi Tenacity throws at it, from high-speed competition runs to aggressive terrain exploration.

Key Features

• 60% Increased Hinge Pin Support Strength — Key areas requiring additional strength, particularly the outer hinge pin support diameters, have been beefed up by as much as 60 percent, meaning minor crashes and impacts that would normally end your session simply become part of the fun rather than expensive repairs.
• 30° Leading and Trailing Edge Design — This distinctive geometry creates a slim, aerodynamic shape that helps the A-arms transition smoothly up and over obstacles rather than ploughing bluntly into them, improving both handling characteristics and obstacle navigation.
• Reduced Slop for Enhanced Performance — RPM has engineered these A-arms with tightened tolerances throughout, removing slop from the suspension platform and creating a much smoother, more consistent foundation for reliable camber, caster and toe angle settings that remain stable through aggressive driving.
• Stock Geometry Compatibility — The suspension geometry is set to stock Losi specifications, meaning installation is simply a direct swap with minimal setup work required to get back on the track or trail, making this an ideal upgrade for those wanting improved durability without geometry changes.
• Sold as a Pair — You receive both front A-arms needed for your Losi Tenacity, ensuring consistent suspension performance across the entire front end of your RC truck.
• Nearly Indestructible Nylon Construction — Manufactured from RPM's proprietary blend of durable nylons, these A-arms are engineered to withstand the punishment that competitive racing and aggressive bashing demand.
• USA Manufactured — Built to exacting standards in the United States, these suspension components represent genuine quality engineering backed by RPM's reputation for excellence in the RC hobby industry.
• Drop-in Replacement for Stock Parts — These A-arms directly replace the stock Losi part number LOS234016, making the upgrade process straightforward for existing Losi Tenacity owners.

Technical Performance

The RPM Front A-Arms for Losi Tenacity represent a masterclass in suspension engineering optimised for the demanding world of RC truck racing and bashing in the UK. The construction material — RPM's nearly indestructible nylon blend — has been proven through countless hours of competitive use to deliver exceptional durability without sacrificing the lightweight properties essential for responsive handling. The 30° leading and trailing edge geometry isn't merely aesthetic; this design fundamentally improves how your Losi Tenacity interacts with terrain, allowing the truck to climb obstacles more effectively whilst reducing the blunt impact forces that typically damage suspension components. The 60% increase in outer hinge pin support diameter strength addresses one of the most common failure points in RC truck suspension, ensuring that aggressive driving and occasional mishaps don't prematurely end your RC session. By tightening manufacturing tolerances throughout the A-arm design, RPM has eliminated the slop that plagues stock suspension components, creating a more precise suspension platform that maintains accurate camber, caster and toe angles even during aggressive cornering or high-speed running. This precision translates directly into improved handling predictability and cornering stability. The fact that suspension geometry remains at stock specifications means you can install these A-arms and immediately enjoy improved durability without the need for complex re-geometrying or adjustment procedures — a genuine quality-of-life improvement for RC enthusiasts who want to spend more time driving and less time tuning.

What's in the Box

• RPM Front A-Arms for Losi Tenacity (pair — includes both left and right arms)
• Black nylon construction

What You Need to Complete

• Metal tubes for outer hinge pins (transfer from your stock Losi Tenacity A-arms)
• Your existing Losi Tenacity U4 Lasernut, TT, DB, Pro, Monster Truck or T model

Frequently Asked Questions

• Will these RPM A-arms fit my Losi Tenacity U4 Lasernut? — Yes, these RPM front A-arms are specifically designed for the Losi Tenacity U4 Lasernut and will fit perfectly as a direct replacement for the stock Losi LOS234016 A-arms. They also fit the Losi Tenacity TT and DB platforms, as well as the discontinued Pro, Monster Truck and T models.
• Do I need to adjust the suspension geometry after installing these A-arms? — No, the suspension geometry on these RPM A-arms is set to stock Losi specifications, which means installation is a simple swap requiring very little work to get your Losi Tenacity back on the track. This is one of the key advantages of choosing RPM suspension components.
• What makes these A-arms more durable than the stock Losi parts? — RPM has strengthened key areas, particularly the outer hinge pin support diameters, by as much as 60 percent. Combined with their nearly indestructible nylon blend material and the 30° leading and trailing edge design that helps transition over obstacles rather than plough into them, these A-arms are engineered to survive the impacts and stresses that would damage stock components.
• Are these A-arms suitable for both racing and bashing? — Absolutely. RPM designed these A-arms with the primary goals of strength and durability, making them ideal for both competitive racing and aggressive bashing. The increased hinge pin support strength means occasional crashes won't end your session, while the precision tolerances and reduced slop benefit competitive racers seeking reliable suspension geometry.
• Do these A-arms come with metal hinge pin tubes? — No, these A-arms do not include the metal tubes for the outer hinge pins. You will need to transfer the metal tubes from your existing stock Losi A-arms to the RPM A-arms during installation.
• Are these A-arms a quality upgrade for an RC buggy owner in the UK? — Yes, while these are specifically designed for the Losi Tenacity line, they represent the type of quality suspension upgrade that serious RC enthusiasts across the UK value highly — improved durability, precision tolerances, and proven performance from an established manufacturer.

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 FRONT A-ARMS LOSI TENACITY U4 LASERNUT BLACK RPM81662 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.