Air pressure & load index Part 3 - Extra Load / Reinforced Tyres

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Here's the continuation from part 1

[Orablue]

Inflation Pressure of Reinforced / Extra Load Tyres

When upgrading tyres from 195/65R15 91H to 215/45R17 91V, we typically assumes that the new set of tyres requires the same pressure since the load index is the same. However, some tyres are "reinforced" / "extra load" tyres that were designed to carry additional weight. The inflation pressure of these tyres are different from standard tyres.

 

In most cases, 215/45R17 91V tyres are "extra load". So according to the articles below, if the original 195/65R15 91H tyres require 230 kPa, the new 215/45R17 91V tyres will need about 270kPa.

 

In general, "reinforced" / "extra load" tyres requires 6psi (approx 40kPa) of additional pressure to support the same weight as standard tyres.

 

 

[inline TTT_18.jpg]

 

 

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"Reinforced" Tire Specification Load (Lbs) and Inflation (PSI) Table

Based on ETRTO Data

[inline "Inflation Pressure Chart.jpg"]

 

 

 

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"Reinforced" Tire Specification Load (Lbs) and Inflation (PSI) Table

Based on ETRTO Data

[inline "Inflation Pressure Chart - Reinforced.jpg"]

Note: