The Ultimate Buyer's Guide for Purchasing Tyre coupling

May. 12, 2025

The Ultimate Buyer's Guide for Purchasing Tyre coupling

Selecting the Right Tyre Coupling

April 8, / Couplings

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Tyre couplings play a crucial role in connecting rotating shafts and transmitting power efficiently. Whether you are replacing existing couplings, choosing tyre couplings for new projects, or exploring new options, choosing the right tyre coupling is essential for maintaining optimal performance and preventing downtime. In this guide, we'll explore two perspectives on selecting the right tyre coupling: one for replacement and the other for a brand new selection.

Replacing your Couplings: Ensuring Compatibility for Efficient Replacement

When replacing a tyre coupling, it is crucial to identify and match the specific model and components. The tyre coupling consists of five main parts: the tyre, the two hubs, and the two taper bushes. Here's a step-by-step guide to selecting the correct replacement parts:

a. Identification of part number on Tyre couplings and Taper Bush: Start by examining the existing tyre. Look for any markings, model numbers, or specifications imprinted on the surface. These markings often include information about the material, size, and load capacity of the tyre. Take note of these details as they are crucial for finding a suitable replacement.

Image 1: The part number 'F110H-' is printed on the hub. This is the full Tyre coupling part number. '' stands for the taper bush part number.

Note that if there's special indications such as FRAS, which stands for 'Fire Resistant Anti Static'.

b. Consult with Experts: If you encounter challenges in identifying the coupling model or finding suitable replacement parts, let Shafttech know and we will assist with this.

New Selection: Selecting Tyre couplings for new applications or projects or Changing a Pin & Bush Coupling to Tyre Coupling

Selecting a tyre coupling from a catalogue involves a systematic consideration of various parameters to ensure compatibility with your specific application. Here's a step-by-step guide that takes into account motor power, output speed, output torque, shaft sizes, and DBSE (Distance Between Shaft Ends):

Gather System Information: Collect the following information about your system:
- Motor Power (kW or HP)
- Output Speed (RPM)
- Output Torque (Nm or lb-ft)
- Shaft Sizes (diameters and keyway dimensions)
- DBSE Distance (Distance Between Shaft Ends)
Refer to the Catalog Index: Start by looking at the index of the Fenner Tyre coupling catalogue. Look for theection related to motor power, output speed, torque ratings, shaft sizes, and DBSE.
Filter by Motor Power: Find the section in the catalog that corresponds to the motor power of your application. This narrows down the options to couplings suitable for your motor.
Consider Output Speed Requirements: Within the selected motor power range, choose the range that matches your application's based on the output speed requirements.
Evaluate Torque Ratings: Check the torque ratings provided for the couplings within the selected power and speed ranges. Ensure that the selected coupling can handle the torque generated by your application.
Verify Shaft Size Compatibility: Look for detailed specifications on shaft sizes for each coupling. Verify that the coupling's maximum bore sizes match the diameters of your shafts. Pay attention to keyway dimensions as well.
Incorporate DBSE Requirements: Find the section in the catalog that provides information on DBSE or overall dimensions. Choose the range that accommodates your system's DBSE requirements. Consider the flexibility of the coupling in dealing with DBSE limitations. Shafttech offers special Spacer-type Tyre couplings from Fenner that can accommodate longer gaps between machinery.
Examine Construction Materials: Evaluate the materials used in the construction of the coupling. Consider factors such as environmental conditions, temperature, and corrosion resistance. Is there a need for explosion proof or fire resistant anti static properties?

By following these steps and considering motor power, output speed, output torque, shaft sizes, and DBSE, you can make a comprehensive and informed selection of a tyre coupling that meets the specific needs of your application. Shafttech is an expert in couplings for all industries. If you are looking for any kind of couplings, contact us today at and we will be able to discuss your specific needs.

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What is coupling?

Coupling is a mechanical device that used to connect two shafts and to transmit power. The primary purpose of coupling is to connect the units of shafts in proper alignment with one another that are manufactured separately and rotating such as generator and motor.

They allow movement to the ends, flexibility, and provide disconnection of these two devices for repairs and modifications.

There are several types of couplings in the industry but the two most common couplings are rigid coupling and flexible coupling.

What are the uses of couplings?

Now as you have deep knowledge about the parts of couplings, manufacturing of coupling, and functioning of couplings. As we discussed above the basic function of coupling is to transmit the power to a device.

As the system starts, parts of the couplings start vibrating and moving after that the alignments get change. Here the use of coupling comes along.

The basic use of it is to align all the parts in a proper way either in a parallel way or based on the orientation.

End float is another problem which is caused due to the axial movements at the ends. In this case, the coupling has to make sure that this problem is dealt with in a right manner. There are some also other coupling devices that assigned the job of reducing the vibration and shock which are the major reasons for causing problems.

Another major use of coupling is this is responsible for the protection of the machine.

Types of Couplings

Jaw Couplings

Jaw coupling has two jaws that are interconnected with each other and an electrometric spider is placed between the two jaws. The application of this coupling is used for dampening of the torsion.

Sleeve Couplings

This type of couplings has a male spline and a female hub spline. The male spline interjects with the female hub spline along with the electrometric insert. This coupling is effective for end float and used for Hytrel or Neoprene.

Tire Coupling

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The primary function of this coupling is to reduce the vibrations or shock. This is made up of Polyurethane and sometimes rubbers.

As the force is given in the form of shear this type of material flexing coupling lasts for a long time.

Disc Coupling

Generally, this types of couplings work on the transmission of torque through the different elements of flexing discs. Compression and tension are two main aspects of this coupling. They may be single or double disc pack.

Diaphragm Coupling

When it comes to the high amount of torque and speed then for this type of coupling is perfect.

The flexible part of the coupling is either through a single diaphragm or many diaphragms. It can also deal with the misalignments.

Mechanical flexing coupling

They work on the concept of sliding, rocking, or rolling of metal surfaces. They need lubrication while performing the functions. This is one of the best types of flexible couplings is divided into two type grid and gear couplings.

Roll Chain Couplings

When the speed and torque requirement becomes low ten this coupling is used. It contains a double pitch.

How to maximise traction with my tractor tyres

Not all your engine power is directed into carrying out your work. Part of this power is used to operate your tractor and another part is lost due to incorrect settings or failure to optimise your equipment. The power dedicated to traction varies from 30 to 62% depending on your choices, your settings, your equipment or your implements.
You can easily boost the productivity of your tractor and double the amount of power transmitted to the ground.

This article introduces the different optimisation points that you easily develop when replacing your tyres, simply by choosing a model that is perfectly adapted to the work you do, with better traction capacity and less slip.

You have chosen to invest in a powerful machine and you have the opportunity to get more from its power, to boost productivity and improve your yields.

1. How is the engine power used?

Traction power is the force available at the coupling hook to draw your implements.

Unfortunately, you cannot use 100% of the engine power for this tractive effort because part is used for the mechanical operation of your tractor. However, you do have the possibility of increasing the power available for your work, by making use of different adjustments, with the tyres certainly the part that is easiest to adapt.

The mechanical elements that use up part of the power correspond to the hydraulic, cooling or exhaust systems… another part is used by the drive shaft which transmits engine power to the tyre rim with a loss of efficiency of around 5 to 10% on average. These mechanical losses are inevitable and there is little possibility of optimisation at this level.

Breakdown of the use of engine power

However, there is some room for manoeuvre in relation to the main loss of power at the level of the tyres, where there are 2 types of loss of power:

1. Rolling resistance

Elle peut atteindre 25%, c'est quand le pneu s’enfonce dans le sol meuble, en fonction de plusieurs paramètres :

the weight on the axle,
the inflation pressure,
the width of the tyre,
its technology,
its structure.

The more the tyre sinks into the ground, the higher the rolling resistance and the more power required to draw the trailer.

2. Slip

Loss of power linked to the tyres slipping on the ground can reach up to 30%, or more. Slippage is obviously linked to weather conditions, but also to various specific tyre parameters:

their technology,
their design,
the pressure at which they are used.

The objective is not to eliminate slip, which is necessary, but to control it perfectly to ensure optimal transmission of traction.

2. More traction with the right tyre dimension

The first point to bear in mind is that the transmission of power to the ground increases with the size of the contact patch between tyre and ground. The larger the contact patch with the ground, the more lugs there are to grasp hold of the ground, which improves traction mechanically.

When you buy your tractor, the tyres supplied are an average choice, allowing the manufacturer to limit the overall acquisition budget, but they are generally not the most suitable tyre solution for your farm.

If you work in large-scale fields, with a powerful tractor and heavy implements, use tyres with a higher volume of air, which will allow you to work with a heavy load without having to increase inflation pressure, thus increasing the contact patch with the ground and your traction capacity.

Changing tyre size allows you to increase the contact patch with the ground

3. The tyre design is crucial to its efficacity

Not all the tyres available on the market have benefitted from the same level of research and development and often certain details, which may seem insignificant, have a real importance in actual operating conditions over several hectares.

The involute lug

LOne of the main transmitters of engine power to the ground are the tyre lugs. The leading edge of the lug digs into the ground, then takes a hold on the earth to transmit torque.

The lugs generate a horizontal compression which transmits tractive force to the ground. When they disengage, classical lugs create a soil displacement effect by lifting the earth and reducing the tyre’s self-cleaning capacity.

Bridgestone’s Involute lug design has been optimised to avoid this soil displacement effect thanks to a specific lug construction which increases the transmission of horizontal force. Their very particular profile angle allows excellent self-cleaning of the surface of the tyre before it comes into contact with the ground again.

Video explaining the role of involute lugs in providing improved traction

4. Management of pressure to maximise traction

Pressure adjustments have a direct impact on your tractor’s traction capacity. By working at low pressure, you increase the size of the soil footprint and, just like with a change in tyre size, your lugs will have a better hold on the ground. Adjusting inflation pressure allows you to avoid working with overinflated tyres, which can generate slippage rates of up to 30%, which also has an impact on fuel consumption, tyre wear and working time.

Testing in real conditions

In the example below, we carried out tests in a field, varying the inflation pressure on the same tractor, on the same plot of land, in the same weather conditions. The difference is clearly visible:

On the left: with inflation pressure at 1 bar, self-cleaning was correct and traction efficient despite the wet conditions.
On the right: with inflation pressure at 1.25 bar, there was immediate slippage.

Slippage linked solely to a change in tyre pressure

5. The use of VF tyres to be sure of obtaining improved traction

There is an enormous difference in productivity between 30% transmission of tractive force and optimal traction of 62%.

Can you imagine what that represents in working time and in fuel in the space of one day? one month? or a full year?

VF technology for work at very low pressure

Taking into consideration each of the points mentioned above, you can further optimise traction capacity by choosing the best that technology has to offer. VF tyres such as the VT-TRACTOR allow you to work at an inflation pressure of as low as 0.6 bar while increasing your load.

This type of tyre is the perfect solution if you wish to avoid duals and all the related disadvantages while retaining all the benefits.

VF technology allows you to work at an inflation pressure of 0.6 bar

Saving time on pressure adjustments

The reinforced casing structure and exceptional sidewall design of these tyres makes it possible, without any problem, to drive on the road with the same inflation pressure as used in the fields. These improved flexion tyres mean that you no longer have to waste time adjusting your inflation pressure each time you change operating area (field/road, road/field.

The Bridgestone-agriculture.eu blog is written and administered by tractor tyre experts who are available to provide you with the advice you need on the subject of your agricultural tyres. They allow you to maximise your productivity with information on all subjects linked to tyres: Cheap tractor tyres — Technical data for agricultural tyres — Air pressure advice — Solutions to avoid soil compaction — Sprayer tyre pressure — Why and how to ballast your tractor tyres — When to use dual wheels — The mechanical causes of abnormal wear — Cheap agricultural tyres – etc…

To learn more and boost your farm's profits, Bridgestone-Agriculture is offering you a free, detailed white paper that explains the essential role your agricultural tyres play in your productivity.

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