2018 RAM ProMaster 2500 Tire Size

The original tire size for your 2018 RAM ProMaster 2500 is listed below. Tap on the box to view a color-coded explanation of the best RAM ProMaster 2500 tire size.

LT225/75R16/E 115R

Simplified Size:  225-75-16

Simplified size is useful for shopping and buying tires.

The original tire size for your 2018 RAM ProMaster 2500 is LT225/75R16/E 115R.  A color-coded explanation of the 2018 RAM ProMaster 2500's tire size is shown below.

LT

This letter denotes the intended use of the tire.

PPassenger Vehicle
LTLight Truck
CCommercial Vehicle
225

This number indicates that your tire has a width of 225 millimeters.

75

This number means that your tire has an aspect ratio of 75%.  In other words, your tire's sidewall height (from the edge of the rim to the tire's tread) is 75% of the width.  In this case, the sidewall height works out to be 168 millimeters.

R

This letter denotes how your tire was constructed.  Radial is the standard construction method for about 99% of all tires sold today.

RRadial
BBias Belt
DDiagonal
16

The tire size was designed to fit rims or wheels that are 16 inches in diameter.

E

The mark of E denotes your tire's load range, or ply rating.  A load range of E means that the tire has a ply rating of 10.  Letters further along in the alphabet represent stronger tires that can sustain higher inflation pressures.  Tires with higher inflation pressures can carry heavier loads.

115

This tire has a load index of 115, which means it's capable of carrying a load of 2673 pounds (1215 kg) or less.  A higher number means the tire can carry more weight.  A lower number means the opposite.

R

This tire has a speed rating of R, which means 105 mph (170 km/h) is the maximum speed that can be sustained for 10 minutes.  A higher speed becomes dangerous.