## CHS: Commercial Truck Dosage Calculations

In order to calculate the dosage requirements for a** CHS Commercial High Speed Truck Tyre** you need to use the following formula. If you have any queries or need assistance then please **contact us**.

This **Dosage calculation** uses **Tyre Width (inches)** X **Tyre Height (inches)** X **0.082** = dosage rounded to the nearest USA Ounce.

Tyre Height is (2 x Tyre Width x Aspect Ratio) + Rim Diameter.

1. Example Tyre: **Metric**

Tyre designation: **295/80R22.5**

295 = Tyre Width in** millimetres**

80 = Aspect Ratio = % of tyre Width that each Sidewall is tall

22.5 = Rim Diameter in **inches**

2. Example Tyre: **Non- Metric**

Tyre Designation: **11R22.5**

11= Tyre Width in **inches**

22.5= Rim Diameter in **inches**

Note: Aspect Ratio is presumed **100 **that is,** Width= Sidewall Height.**

The Calculator provides for **Regular Dosage** and **Severe Dosage** applications (Regular Dosage is multiplied by a factor of **1.25)**.

**Severe Dosages** are used where it is expected that the Tyre (s) will be subjected to **numerous punctures / injuries**- eg Waste or Construction Truck.

## HDOTR: Heavy Duty Off-Road Dosage Calculations

In order to calculate the dosage requirements for **HDOR (Heavy Duty Off- road) Tyres** you need to use the following formula. If you have any queries or need assistance then please **contact us**.

This **Dosage calculation** uses **Tyre Width (inches)** X **Tyre Height (inches)** X **0.157** = dosage rounded to the nearest USA Ounce.

Tyre Height is (2 x Tyre Width x Aspect Ratio) + Rim Diameter.

1. Example Tyre: **Metric**

Tyre designation: **600/55R26.5**

600 = Tyre Width in** millimetres**

55 = Aspect Ratio = % of tyre Width that each Sidewall is tall

26.5 = Rim Diameter in **inches**

2. Example Tyre: **Non- Metric**

Tyre Designation: **23.6R26.5**

23.6= Tyre Width in **inches**

26.5= Rim Diameter in **inches**

Note: Aspect Ratio is presumed **100 **that is,** Width= Sidewall Height.**

The Calculator provides for **Regular Dosage** and **Severe Dosage** applications (Regular Dosage is multiplied by a factor of **1.5**).

**Severe Dosages** are used where it is expected that the Tyre (s) will be subjected to **numerous punctures / injuries.**

## AUTO/SUV Dosage Calculations

In order to calculate the dosage requirements for **AUTO/SUV Tyres** you need to use the following formula. If you have any queries or need assistance then please **contact us**.

This **Dosage calculation** uses **Tyre Width (inches)** X **Tyre Height (inches)** X **0.0654** = dosage rounded to the nearest USA Ounce.

Tyre Height is (2 x Tyre Width x Aspect Ratio) + Rim Diameter.

1. Example Tyre: **Metric**

Tyre designation: **285/85R15**

285 = Tyre Width in** millimetres**

85 = Aspect Ratio = % of tyre Width that each Sidewall is tall

15 = Rim Diameter in **inches**

2. Example Tyre: **Non- Metric**

Tyre Designation: **11.R**

11.2= Tyre Width in **inches**

15.0= Rim Diameter in **inches**

Note: Aspect Ratio is presumed **100 **that is,** Width= Sidewall Height.**

The Calculator provides for **Regular Dosage** and **Severe Dosage** applications (Regular Dosage is multiplied by a factor of **1.25**).

**Severe Dosages** are used where it is expected that the Tyre (s) will be subjected to **numerous punctures / injuries.**

## MOT: Motorcycle Dosage Calculations

In order to calculate the dosage requirements for **MOT Motorcycle Tyres** you need to use the following formula. If you have any queries or need assistance then please **contact us**.

This **Dosage calculation** uses **Tyre Width (inches)** X **Tyre Height (inches)** X **0.06** = dosage rounded to the nearest USA Ounce.

Tyre Height is (2 x Tyre Width x Aspect Ratio) + Rim Diameter.

1. Example Tyre: **Metric**

Tyre designation: **180/60R16**

180 = Tyre Width in** millimetres**

60 = Aspect Ratio = % of tyre Width that each Sidewall is tall

16 = Rim Diameter in **inches**

2. Example Tyre: **Non- Metric**

Tyre Designation: **7.0/R**

7.0= Tyre Width in **inches**

16= Rim Diameter in **inches**

Note: Aspect Ratio is presumed **100 **that is,** Width= Sidewall Height.**

The Calculator provides for **Regular Dosage** and **Severe Dosage** applications (Regular Dosage is multiplied by a factor of **1.25**).

**Severe Dosages** are used where it is expected that the Tyre (s) will be subjected to **numerous punctures / injuries** or if **MOT** is used on Tyres **without Wheel Weights**.

## ATV: Dosage Calculations

In order to calculate the dosage requirements for **ATV Tyres** you need to use the following formula. If you have any queries or need assistance then please **contact us**.

This **Dosage calculation** uses **Tyre Width (inches)** X **Tyre Height (inches)** X **0.087** = dosage rounded to the nearest USA Ounce.

Tyre Height is (2 x Tyre Width x Aspect Ratio) + Rim Diameter.

Example Tyre: **Non- Metric**

Tyre Designation: **24 x 8 - 11**

8= Tyre Width in **inches**

11= Rim Diameter in **inches**

Note: Aspect Ratio is presumed **100 **that is,** Width= Sidewall Height.**

The Calculator provides for **Regular Dosage** and **Severe Dosage** applications (Regular Dosage is multiplied by a factor of **1.5**).

**Severe Dosages** are used where it is expected that the Tyre (s) will be subjected to **numerous punctures / injuries.**