CENTRAL ALUMINIUM PULLEY 26T

Machined precision in every tooth: the Aluminium Central Pulley 26T for competition transmissions

The Aluminium Central Pulley 26T (3RAC-3PY/26) is a belt-drive transmission component made from machined aluminium, designed for those looking to reduce rotating weight and maintain maximum accuracy in power transfer. With 26 teeth, it fits into belt-drive configurations where the diameter and pitch of the belt are crucial for fine-tuning the gear ratio.

Main features

• Material: machined aluminium, lightweight and wear-resistant.
• Number of teeth: 26T, allowing adjustment of the gear ratio in belt-drive systems.
• Reference: 3RAC-3PY/26.
• Precise finish that ensures a correct fit with the belt and minimises vibrations.
• Reduction of rotating mass compared to equivalent parts in plastic or steel.

Function and performance

In a belt-drive transmission system, the central pulley acts as a link between the power source and the receiving shaft. The choice of the number of teeth directly influences the final speed and available torque: a 26-tooth pulley offers a balance point that many tuners use as a starting reference before adjusting with pulleys of higher or lower tooth count.

Machined aluminium provides two key advantages over plastic: less deformation under load and better heat dissipation generated by belt friction. The result is more stable behaviour and a longer lifespan under intensive use conditions.

Installation and preparation

Before installing the pulley, it is advisable to verify that the pitch of the belt used in the assembly is compatible with the tooth profile of this part. Correct alignment between the motor pulley, central pulley, and receiving pulley prevents premature wear and efficiency losses. It is recommended to check the belt tension after the first run, as aluminium may exhibit slight initial settling.

Compatibility

This pulley is designed under the nomenclature of 3Racing, a manufacturer specialised in spare parts and upgrades for RC. Exact compatibility depends on the chassis or transmission assembly for which it is specified within the 3RAC catalogue. Check the complete reference of the vehicle or transmission kit to confirm that the belt pitch and axle diameter are correct before placing the order.

Common mistakes

• Installing the pulley without checking alignment with the rest of the transmission train, leading to lateral wear on the belt.
• Confusing the belt pitch: not all 26-tooth pulleys are interchangeable if the pitch is different.
• Over-tightening the fixing screw on the shaft, which can cause ovalisation of the hole in the aluminium.

Frequently asked questions

What does "26T" mean on a pulley?

"26T" indicates that the pulley has 26 teeth. This number determines the gear ratio of the system: combined with the receiving pulley, it defines how many revolutions the output shaft makes for each revolution of the input shaft.

Can I use this pulley with any belt-drive?

Not necessarily. The pulley must match the pitch of the belt. Verify that the pitch of your kit's belt is compatible with the tooth profile of this reference before installation.

What advantage does aluminium have over plastic in a pulley?

Machined aluminium is stiffer, better resists deformation under continuous load, and dissipates heat more effectively. Additionally, it maintains the tooth profile for a longer time, reducing the risk of belt skipping.

Do I need any special tools to mount it?

Generally, standard Allen keys from the RC maintenance set are sufficient. However, a pulley alignment tool or a precision ruler may be useful to ensure that the assembly is perfectly aligned.

Is it compatible with competition chassis?

It depends on the chassis and transmission system for which 3Racing has designed this reference. Consult your kit's documentation or contact us if you have questions about specific compatibility.

The 3RAC-3PY/26 is a 26-tooth aluminium central pulley designed for belt-drive transmission systems in RC vehicles. Machined aluminium construction ensures lightweight performance, reduced rotational mass, and long-lasting durability under competition conditions. A precise fit with compatible belts minimises vibration and power loss, making it a reliable upgrade choice for hobbyists and competitive RC drivers looking to fine-tune their drivetrain ratio.

Information not found

It has not been possible to reliably confirm the specific chassis or transmission kits from 3Racing for which this pulley is designed, nor the exact diameter of the axle hole or compatible belt pitch. It is recommended to cross-check with the official documentation from 3Racing or contact Ministry of Hobby before placing the order if you have doubts about compatibility with your assembly.