The "Tread Loss" is, as the name implies, the amount of tread rubber left on a scrapped casing.

It is a useful metric to help a fleet optimize its tire assets.
It is often expressed:

1. In Millimeters or 32nds

2. As a percentage

3. As a monetary value.



1. TREAD LOSS IN MILLIMETERS OR 32nds

The tread loss here is simply equal to the usable tread depth remaining on the tire.

It is calculated as follows:


Tread Loss (mm or 32nd) = Remaining Usable Tread = Average RTD - Pull Point

Notes:

- If the average remaining tread depth is below the pull point, the usable tread depth remaining is zero

- The "pull point" value used in the report is the one entered prior to run the report in the field shown below:



2. TREAD LOSS PERCENTAGE
As a percentage, it is the ratio between the usable tread remaining (Average RTD - Pull Point) and the original usable tread (OTD - Pull Point).


Tread Loss % = (Average RTD - Pull Point) / (OTD - Pull Point) 



3. TREAD LOSS MONETARY VALUE

This is calculated by multiplying the tread loss in mm/32nds by the value of 1mm or 32nds of tread.


- Let's suppose a casing with a cost of 500 USD.

- The tire has an OTD of 13 mm

- The pull point is set at 3 mm


--> The total usable tread is 10 mm.

--> The monetary value is $50 per millimeter.


If this casing has been removed with 8 mm of tread on it, then a total of 5 mm is lost (8 mm - 3 mm).
Therefore the monetary loss is $250 ($50 x 5 mm)


Note:

To calculate this value on the report, you need to have entered the new tire (or retread) purchasing cost under the Fleet Profile.