Cycling accessory built for electric bikes that reduces the risk of motor loosening and axle damage. Lunos Torque Arm Conversion Kit gives riders reassurance on commutes and off-road rides by strengthening motor mounts. Is this kit the right fit for your hub motor and dropout setup?
⚡ At a Glance
- • Torque Protection: Prevents motor slipping and split-shaft bending by anchoring the motor to fork or frame
- • Best for: E-bike owners retrofitting hub motors who want a stronger, more secure mount
- • Not ideal for: Motor shafts with specialised shapes or diameters exceeding 14mm
Stainless-steel reaction arms include a long and a short arm with clamps sized for common hub shafts. The kit comes with all essential fasteners to retrofit front or rear motors.
Keeps motors secure, with stainless-steel torque arms
Reaction arms measure 86mm in length with axle and clamp openings of 14mm by 10mm, arm thickness 3mm and hub mount thickness 4mm, giving a rigid mechanical interface. Clamps and collars lock against the dropout or fork to resist rotational force from the motor.
Stronger mounting reduces the risk of the motor shifting, the axle bending, or the motor slipping under load. Reliable clamping is particularly useful for high-torque starts and steep climbs.
Long-lasting protection, with corrosion-resistant stainless steel
High-quality stainless steel construction has a treated surface to resist oxidation and corrosion while maintaining structural strength and finish. Material selection targets endurance under wet and abrasive conditions.
Corrosion resistance keeps parts functioning and looking good over time, reducing the need for frequent replacement or maintenance in damp climates.
Quick retrofit and portability, with a complete two-arm kit and hardware
Kit contents include one long reaction arm, one short reaction arm, a hexagonal screw, a collar, a nut and two washers, all sized for normal motor shafts up to 14mm. Compact components keep overall weight low and make on-bike replacement straightforward.
Easy to carry as a roadside repair option and quick to fit during upgrades, the kit supplies the main parts needed to reinforce most common hub motor installations.
✨ The 4 Key Reasons for Lunos Torque Arm Conversion Kit
- Stainless-steel construction - Withstands torque and road wear for long-term reliability
- Precise dimensions - 86mm arms and 14mm x 10mm clamp openings fit common hub shafts
- Corrosion-resistant finish - Surface treatment preserves strength and appearance in wet conditions
- Complete hardware kit - Long and short arms plus fasteners ready for immediate retrofit
📋 Technical Details at a Glance
- Category: Sports / Electric bicycle accessory
- Brand: Lunos
- Material: High-quality stainless steel with treated anti-corrosion finish
- Arm length: 86mm
- Axle opening: 14mm x 10mm
❓ Frequently Asked Questions
Q: Will the kit fit my motor shaft?
A: The kit fits normal motor shafts with a diameter not exceeding 14mm; special or non-standard shafts are excluded.
Q: Can the arms be used on the front and rear of the bike?
A: Yes, the arms are designed to prevent motor detachment when mounted on the front fork or the rear frame dropout.
Q: What hardware is included in the package?
A: The set contains a long reaction arm, a short reaction arm, one hexagonal screw, one collar, one nut and two washers, matching the pictures provided.
🏆 Our Verdict
Suitable for e-bike owners who want a straightforward way to reinforce hub motor mounting, especially commuters and mountain bikers. Durable stainless-steel arms with a corrosion-resistant finish and a full set of fasteners provide practical, long-term protection for common motor shafts. Strong material choice and included hardware deliver reliable value by reducing the likelihood of on-road failures.
