Euro metric vs light truck rating (1 Viewer)

[highfructose]

Would a light truck load range c at 2750 lbs max load be comparable to a euro metric tire of the same size with a 2750 lb max?

Or is there some formula one has to apply to “translate” a euro metric tire rating to make it comparable to the light truck tire?

Like I hear stuff about 10-11% reduction for p metric tires when comparing them to light trucks…is it the same with eurometrics?

 

[bloc]

How exactly do you mean "comparable"?

LT tires have heavier duty construction than P or straight metric tires, even if the load limit is the same. That more robust construction is the primary reason they need to run more pressure for a given load.. the thicker construction means more friction within the tread of the tire, and you need to increase pressure to prevent temperatures getting so high that the tire fails.

So in general the LT tire will be "tougher". Also usually have deeper tread for mud, worse mileage, more noise, etc.

Tire Pressure recommendation

I am running the Goodyear Duratrac in 285/70/17 on RW wheels. All the charts that I have found and somewhat understand look as if 49psi is the correct pressure I should run. I am stock, other than a Gobi roof rack. The specs on the Duratracs are as follows - Tire SizeLT285/70R17 Speed...

forum.ih8mud.com

 

[highfructose]

How exactly do you mean "comparable"?

LT tires have heavier duty construction than P or straight metric tires, even if the load limit is the same. That more robust construction is the primary reason they need to run more pressure for a given load.. the thicker construction means more friction within the tread of the tire, and you need to increase pressure to prevent temperatures getting so high that the tire fails.

So in general the LT tire will be "tougher". Also usually have deeper tread for mud, worse mileage, more noise, etc.

Tire Pressure recommendation

I am running the Goodyear Duratrac in 285/70/17 on RW wheels. All the charts that I have found and somewhat understand look as if 49psi is the correct pressure I should run. I am stock, other than a Gobi roof rack. The specs on the Duratracs are as follows - Tire SizeLT285/70R17 Speed...

forum.ih8mud.com

Comparable in the sense that a truck needing 2750 lbs max load rating could interchangeabley use a euro metric or light truck?

Like I do not understand the reduction of load limits for light truck vs p metric.

Wondering whether tire for tire between light truck and euro metric tire that 2750 lbs means 2750 lbs.

 

[gaijin]

Comparable in the sense that a truck needing 2750 lbs max load rating could interchangeabley use a euro metric or light truck?

Like I do not understand the reduction of load limits for light truck vs p metric.

Wondering whether tire for tire between light truck and euro metric tire that 2750 lbs means 2750 lbs.

This is always a good read: Guidelines for the Application of Load and Inflation Tables

HTH

 

[bloc]

a truck needing 2750 lbs max load rating could interchangeabley use a euro metric or light truck?

If by interchangeable you mean mix and match on a given vehicle, definitely not. The pressure differences alone...

When talking full sets? Technically they will both handle the load just fine. There are a bunch of other factors at play when choosing a construction though.

But yes gaijin's link is a great read.

 

[highfructose]

If by interchangeable you mean mix and match on a given vehicle, definitely not. The pressure differences alone...

When talking full sets? Technically they will both handle the load just fine. There are a bunch of other factors at play when choosing a construction though.

But yes gaijin's link is a great read.

I’m wondering whether the load ratings are interchangeable.

Whether a 2750 lb euro metric can be swapped for a 2750 lb light truck tire load for load.

Based on the article it’s looking like you have to divide the euro metric tires max load by 1.1 if it’s being placed on a light truck or suv.

Which means even though the sidewall on a k02 load range c might indicate it’s good for 2750 lbs on a 200…and a Nitto classed in euro metric indicates it’s also good for 2750, the Nitto technically would not be…

The Nitto euro metric which claims 2750 is actually only 2500 on an suv (2750 divided by 1.1).

The Nitto euro metric is only rated for 2750 on a car…which is kind of goofy since they have 34”+ tires in euro metric rated for 2750 lbs…and they would always be equipped on a light truck, suv, etc…never a car.

Seems that way anyway. I could be wrong. The system of rating between p, euro metric, flotation, and light truck seems complicated.

 

[gaijin]

I’m wondering whether the load ratings are interchangeable.

Whether a 2750 lb euro metric can be swapped for a 2750 lb light truck tire load for load.

Based on the article it’s looking like you have to divide the euro metric tires max load by 1.1 if it’s being placed on a light truck or suv.

Which means even though the sidewall on a k02 load range c might indicate it’s good for 2750 lbs on a 200…and a Nitto classed in euro metric indicates it’s also good for 2750, the Nitto technically would not be…

The Nitto euro metric which claims 2750 is actually only 2500 on an suv (2750 divided by 1.1).

The Nitto euro metric is only rated for 2750 on a car…which is kind of goofy since they have 34”+ tires in euro metric rated for 2750 lbs…and they would always be equipped on a light truck, suv, etc…never a car.

Seems that way anyway. I could be wrong. The system of rating between p, euro metric, flotation, and light truck seems complicated.

I think your confusion is due to your focus on "max load" which does not figure into the RCTIP calculations at all.

The Key metric to focus on is "Load Limit."

Load Limit for any vehicle is first calculated by using the TIP (Tire Information Placard) found in every vehicle. One uses the OEM tire spec, along with the Load/Inflation tables included in my link above, to calculate the Load Limit for the OEM tire type.

Using that Load Limit, one can find the RCTIP for all other tire types and sizes using the Load/Inflation tables.

Note: P-Metric tires use the P-Metric tables, LT-Metric tires use the LT-Metric tables, ETRO (Hard or Euro-Metric tires) use the Standard Load tables or the Reinforced Load (or XL) tables depending on the tire rating. For ETRO tires the Load Index (e.g. 116, 121, etc.) are used to find the RCTIP.

Max Load numbers, published by the tire manufacturer and branded on the tire along with Max Inflation Pressure, would be checked to make sure that the RCTIP for any tire in question is below the Max Load number. Max Load is an exclusionary variable, not one used to calculate the RCTIP.

As a hypothetical, let's take a LC200 that has a TIP indicating an RCTIP of 33psi for a P285/60R18 tire.

Using the Load/Inflation tables we find that they show a Load Limit of approx. 2512 lbs for P-Metric tires at that pressure. This is our basis for all further calculations.

We want to mount an LT285/70R17 tire on this hypothetical LC200.

Since the LT-Metric tire is a different construction type from the OEM tire (LT-Metric vs. P-Metric) we need to adjust the desired Load Limit value for the LT-Metric tire by dividing the Load Limit for the OEM P-Metric tire by 1.1 - this yields a required Load Limit for the LT-Metric tire of approx. 2284 lbs. This is what we will use to find the RCTIP using the Load/Inflation tables

Using the Load/Inflation tables for LT-Metric tires, we find the Lowest whole number inflation pressure without going below the required 2284 lb Load Limit is 40psi which yields a Load Limit of 2315 lbs.

Last example is a Euro-Metric tire in size 285/65R18 116T SL. Note that we need the Load Index (116) and whether the tire is SL (Standard Load) or Reinforced/Extra Load (XL).

Since Euro-Metric tires are essentially the same construction type as our OEM P-Metric tires, our initially calculated Load Limit of 2512 lbs can be used.

Using the Standard Load Load/Inflation tables, we find the lowest whole number inflation pressure for 116 Load Index tires that is above the required 2512 lbs is 33psi which yields a Load Limit of 2579 lbs.

I hope this helps you understand better how different types of tires can all be used on your vehicle as long as they meet the correct Load Limit requirement.

HTH