- Brand: Losi
- Part Number: Z-LOS262002
- EAN: 0605482170908
- Spare Part Type: Drivetrain Spares
- Compatible Models: Losi 1/4 Promoto-MX Motorcycle RTR (all variants), Losi 1/4 Promoto-SM FXR Supermoto Motorcycle RTR
- Included Components: 2x Rear Insert Plates, 2x 0mm Rear Axle Inserts, 2x +0.25mm Rear Axle Inserts, 2x +0.50mm Rear Axle Inserts, 2x -0.25mm Rear Axle Inserts, 2x -0.50mm Rear Axle Inserts
- Material: Precision Injection Moulded Plastic
- Adjustment Range: -0.50mm to +0.50mm
- Total Adjustment Range: 1mm
- Increment Steps: 0.25mm
- Total Insert Plates: 2
- Total Axle Inserts: 10 (5 different thicknesses, 2 of each)
Overview
The Losi Chain Tension Adjuster Set is an essential spare part for owners of the Losi 1/4 scale Promoto-MX and Promoto-SM motorcycle RTR models. This precision engineering component allows you to maintain optimal chain tension on your RC motorcycle, which is critical for reliable performance and extending the lifespan of your drivetrain. Whether you're a dedicated RC enthusiast in the UK running a ready to run RC motorcycle, or someone who enjoys weekend bashing with their Losi Promoto, this adjustment set gives you the tools to keep your bike running smoothly and efficiently.
Chain tension is one of the most important maintenance factors in any motorcycle or chain-driven RC vehicle. Too loose and your chain will slip or fall off; too tight and you risk premature wear on the chain, sprockets, and bearings. The Losi Chain Tension Adjuster Set solves this problem by providing multiple rear axle insert options that let you fine-tune the exact tension needed for your specific riding conditions and setup preferences. This is the kind of precision tuning that separates casual bashers from serious RC competitors who understand that small details make a big difference in performance and reliability.
Built from precision injection moulded plastic, these adjusters are engineered to provide maximum chain performance and durability. The complete set includes everything you need to dial in your chain tension perfectly, making it an indispensable addition to any Promoto-MX or Promoto-SM owner's spare parts collection.
Key Features
- Precision Injection Moulded Construction — These chain tension adjusters are manufactured using precision injection moulded plastic, which ensures consistent quality, tight tolerances, and reliable performance over many riding sessions. This manufacturing method produces components that fit perfectly and maintain their shape under the stresses of RC motorcycle riding.
- Multiple Adjustment Options — The set includes five different rear axle insert thickness options ranging from -0.50mm to +0.50mm, plus the 0mm baseline insert, allowing you to achieve the perfect chain tension for your specific setup and riding style. This comprehensive range means you can fine-tune tension whether you need to tighten or loosen your chain.
- Complete Drivetrain Solution — With two rear insert plates and ten individual rear axle inserts in total (two of each size), you have enough parts to set up your motorcycle and keep spares on hand for future adjustments. This comprehensive package means you won't be left stranded if you need to change your chain tension mid-season.
- Extends Chain and Sprocket Life — Proper chain tension is essential for preventing premature wear on both your chain and sprockets. By using this adjuster set to maintain optimal tension, you'll dramatically extend the working life of these expensive drivetrain components and avoid costly replacements.
- Easy Chain Maintenance — Changing chain tension is a straightforward procedure with these inserts. Simply swap out the rear axle inserts to adjust tension incrementally, giving you direct control over your motorcycle's drivetrain performance without the need for complex tools or technical expertise.
Technical Performance
The Losi Chain Tension Adjuster Set represents thoughtful engineering focused on one critical aspect of RC motorcycle maintenance: achieving and maintaining perfect chain tension. Built from precision injection moulded plastic, these components offer repeatable, reliable adjustment in precise 0.25mm increments. The set includes rear insert plates and a full range of rear axle inserts (0mm, +0.25mm, +0.50mm, -0.25mm, and -0.50mm), giving you the flexibility to dial in chain tension across a 1mm total adjustment range. This level of precision is essential for 1/4 scale RC motorcycles like the Losi Promoto-MX and Promoto-SM, where drivetrain efficiency directly translates to acceleration, top speed, and overall handling characteristics. The plastic construction is lightweight yet durable, designed to withstand the vibrations and stresses of chain-driven RC motorcycles without deformation or failure. Whether you're running on hard-packed track, dirt terrain, or mixed surfaces, these adjusters ensure your chain stays at optimal tension, reducing slack that could cause chain slip or derailment while avoiding excessive tension that accelerates wear.
What's in the Box
- 2x Rear Insert Plates
- 2x 0mm Rear Axle Inserts
- 2x +0.25mm Rear Axle Inserts
- 2x +0.50mm Rear Axle Inserts
- 2x -0.25mm Rear Axle Inserts
- 2x -0.50mm Rear Axle Inserts
Frequently Asked Questions
- Which Losi RC motorcycles are compatible with this chain tension adjuster set? — This adjuster set is specifically designed for the Losi 1/4 Promoto-MX motorcycle range (including the Pro Circuit RTR, Club MX RTR in blue, and FXR RTR in red) and the Losi 1/4 Promoto-SM FXR Supermoto motorcycle RTR. If you own any of these ready to run RC motorcycles, this is the correct spare part for maintaining and adjusting your chain tension.
- How do I know if my chain tension needs adjusting? — Proper chain tension is critical for performance and longevity. If your chain appears to have excessive slack, pulls to one side, or makes rattling noises, you likely need to adjust tension using this set. Similarly, if you notice increased resistance or difficulty accelerating, tighter chain tension may be needed. This adjuster set allows you to find the sweet spot for your riding style.
- Can I use these adjusters if I'm new to RC motorcycles? — Yes, these adjusters are designed to be user-friendly. The incremental sizing system (from -0.50mm to +0.50mm) makes it easy to try different settings without guesswork. Many UK RC enthusiasts, whether beginners or experienced competitors, use these adjusters as part of basic motorcycle maintenance and tuning.
- What is the difference between the various insert sizes? — The adjusters come in five different thicknesses to allow fine-tuning of chain tension. The 0mm insert represents your baseline position. The +0.25mm and +0.50mm inserts tighten your chain (pulling the rear axle further back), whilst the -0.25mm and -0.50mm inserts loosen it (moving the rear axle closer). This range of options ensures you can achieve perfect tension for your specific setup.
- Why would I need both tightening and loosening inserts? — Different setups, riding conditions, and personal preferences affect optimal chain tension. On softer terrain or at higher speeds, you might prefer slightly tighter tension. On harder surfaces or for technical riding, looser tension might feel better. Having both options means you can experiment and dial in your motorcycle perfectly.
- How often should I adjust my chain tension? — Chain tension should be checked regularly, especially before important racing events or after extended riding sessions. As your chain stretches naturally with use, you may need to tighten tension incrementally using progressively thicker inserts. This adjuster set provides the tools to make these adjustments quickly and easily.
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 Losi Chain Tension Adjuster Set: PM-MX/SM Z-LOS262002 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.
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