How do I convert psi for different load ratings?

[Aag12]

I'm going from the oem 21 to michilin x ice snow 275/60/20 115t winter tires.

I tried finding a online calculator but can't seem to find the right option.

I know oem 21s are 48psi. Anyone know how to convert for the set I'm getting?

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[dradam]

Tire rack website specs 51psi max

 

[chrismc]

Tires usually have a load/inflation chart you can reference. Divide your total vehicle+load weight by 4 to get per-tire load (assuming an even 50/50 loading front to rear, which is the best you can really do without wheel scales).

 

[Forager]

For load index 115 tires, the psi on the door placard is going to be just about right since they are based on 115/116 load index tires.

If you were switching to much higher index tires, like LT tires (mine are 123 index), then using an inflation load chart is the way to go. Here is such a chart that would be used for LT tires:

https://www.toyotires.com/media/pxcjubjs/application_of_load_inflation_tables_20200723.pdf

 

[Aag12]

For load index 115 tires, the psi on the door placard is going to be just about right since they are based on 115/116 load index tires.

If you were switching to much higher index tires, like LT tires (mine are 123 index), then using an inflation load chart is the way to go. Here is such a chart that would be used for LT tires:

https://www.toyotires.com/media/pxcjubjs/application_of_load_inflation_tables_20200723.pdf

Thank you!

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