1999 GMC Jimmy Tire Size

There are multiple tire sizes for your 1999 GMC Jimmy that depend upon the trim level.  Look for your trim level below to get a color-coded explanation of your tire size.  Then pick the best tire size for your 1999 GMC Jimmy.

Trim Options:

SL w/Off-Road SuspensionSLS w/Off-Road Suspension

31x10.50R15/C 109Q

Simplified Size:  31x10.50-15

Simplified size is useful for shopping and buying tires.

The original tire size for your 1999 GMC Jimmy is 31x10.50R15/C 109Q.  A color-coded explanation of the 1999 GMC Jimmy's tire size is shown below.

10.50

This number indicates that your tire has a width of 10.50 inches.

31

This mark reveals that your tire has a diameter of 31 inches.

15

The tire size was designed to fit rims or wheels that are 15 inches in diameter.

109

This tire has a load index of 109, which means it's capable of carrying a load of 2266 pounds (1030 kg) or less.  A higher number means the tire can carry more weight.  A lower number means the opposite.

C

The mark of C denotes your tire's load range, or ply rating.  A load range of C means that the tire has a ply rating of 6.  Letters further along in the alphabet represent stronger tires that can sustain higher inflation pressures.  Tires with higher inflation pressures can carry heavier loads.

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
Q

This tire has a speed rating of Q, which means 99 mph (160 km/h) is the maximum speed that can be sustained for 10 minutes.  A higher speed becomes dangerous.

Trim Options:

EnvoySL 4x2SL 4x4SLE 4x2SLE 4x4SLS 4x2SLS 4x4SLT 4x2SLT 4x4

P235/70R15 102S

Simplified Size:  235-70-15

Simplified size is useful for shopping and buying tires.

The original tire size for your 1999 GMC Jimmy is P235/70R15 102S.  A color-coded explanation of the 1999 GMC Jimmy's tire size is shown below.

P

This letter denotes the intended use of the tire.

PPassenger Vehicle
LTLight Truck
CCommercial Vehicle
235

This number indicates that your tire has a width of 235 millimeters.

15

The tire size was designed to fit rims or wheels that are 15 inches in diameter.

102

This tire has a load index of 102, which means it's capable of carrying a load of 1870 pounds (850 kg) or less.  A higher number means the tire can carry more weight.  A lower number means the opposite.

70

This number means that your tire has an aspect ratio of 70%.  In other words, your tire's sidewall height (from the edge of the rim to the tire's tread) is 70% of the width.  In this case, the sidewall height works out to be 164 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
S

This tire has a speed rating of S, which means 111 mph (180 km/h) is the maximum speed that can be sustained for 10 minutes.  A higher speed becomes dangerous.

Trim Options:

SL 4x4SLE 4x4SLS 4x4SLT 4x4

P235/75R15 105S

Simplified Size:  235-75-15

Simplified size is useful for shopping and buying tires.

The original tire size for your 1999 GMC Jimmy is P235/75R15 105S.  A color-coded explanation of the 1999 GMC Jimmy's tire size is shown below.

P

This letter denotes the intended use of the tire.

PPassenger Vehicle
LTLight Truck
CCommercial Vehicle
235

This number indicates that your tire has a width of 235 millimeters.

15

The tire size was designed to fit rims or wheels that are 15 inches in diameter.

105

This tire has a load index of 105, which means it's capable of carrying a load of 2035 pounds (925 kg) or less.  A higher number means the tire can carry more weight.  A lower number means the opposite.

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 176 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
S

This tire has a speed rating of S, which means 111 mph (180 km/h) is the maximum speed that can be sustained for 10 minutes.  A higher speed becomes dangerous.