FREQUENTLY ASKED QUESTIONS

How often can you retread a tyre?

There are many factors that would have an influence on the retread ability of a tyre casing. Some brands do construct their tyre casings to accommodate retreading. Retread ability also depends on how well the casing was maintained throughout its entire life, the type of operation and underfoot conditions it is exposed to and on the workmanship of the retreader. The national average is 1.75 times.

Is a retreaded tyre not environmental unfriendly considering the pieces of retread rubber that you see lying on the roads?

There are many factors that would have an influence on the retread ability of a tyre casing. Firstly some brands do construct their tyre casings to accommodate retreading.
Retread ability will then depend on how well the casing was maintained throughout its entire life, the type of operation and underfoot conditions it is exposed to and on the workmanship of the retreader.
However the national average is 1.75 times

What chamber pressure do you need to activate the DPC at?

We recommend that you should activate the DPC as soon as the chamber reaches operating pressure (600kpa), and as long as an inspection of each individual exhaust port is done prior to switching over to DPC. The DPC should be set at 150kpa below the main chamber pressure.

Is it cost effective to retread a tyre?

Retreading is certainly very cost effective and in some cases the tread life of a premium retread will out perform the mileage of a new tyre at a little more than a third of a new tyres price. Retreads are a big saving for fleets and have better cost per kilometer than new tyres.

What is an acceptable reject rate when retreading?

The average reject rate is between 18% and 20%, depending on the region. Forestry, quarry and sugar estates have a higher reject rate.

How many operators are needed for a medium sized factory?

The national average is 100 – 110 tyres per man per month, which is equal to 5 – 5.5 tyres per man per day.

How is CPK (Cost Per Kilometer) calculated?

CPK is calculated by dividing the total mileage achieved by a given retread into the price of a retread, including any repair costs added to the retread price.

Can all retreads be fitted in any direction of rotation?

Some retread patterns are designed to rotate in one direction only and cannot perform optimally if fitted incorrectly. This is called a “directional design”.

Why are there many tread patterns in retreading?

Retread patterns are designed to fit all tyre sizes in the target market and to fulfill the requirements in the different market segments and wheel positions. Engineers will therefore design a tread pattern for each market segment, vehicle configuration as well as wheel position that will perform at its best when applied correctly.

Are retreads safe?

Retreading does not change the structure of a new tyre casing in any way and it is therefore safe. In the retreading process it is merely the tread surface of a retreadable casing that is removed and renewed by replacing the old tread with a new one. Any minor injuries are repaired and will render the casing serviceable and safe. Leader Tread are ISO 9002 approved and we ensure our factories also adhere to Leader Tread specification for retreading tyres.

What sort of tonnages am I able to load into a container for exporting?

On average, we are able to fit +/- 18 tons into a 20ft (6m) container and 25 tons into a 40ft (12m) container.

What percentage bonding gum would I require when purchasing treads?

You will need around 12% of bonding gum to your tread purchase. Example 10 000kg precure tread rubber = 1 200kg bonding gum.

What type of training do you offer?

We provide ongoing training to our dealers’ staff, in their factories. We train operators in the retreading process as well as product knowledge and tyre maintenance.

How many tyres can I expect to retread per day if I purchase a 25 tyre chamber?

If your factory is correctly set up with the required machinery and man power, you should be able to do a maximum of 3 cures per day, i.e. 75 tyres per day. This will entirely depend on the correct factory installation.

What is the chamber curing temperature used for bonding gum?

As you may know, rubber is influenced during the curing process by three factors, namely time, temperature and pressure.
Generally, with pressure being a constant, the higher the temperature, the lower the cure time. We have customers operating from 100 degrees Celsius up to 125 degrees Celsius using our low temp bonding and customers operating up to 150 degrees Celsius using our high temp bonding.