tires on 2500HD
Time to put a new set of tires on my 2007 GMC 2500HD. When I bought the used truck it came with 10 ply load range Ds on it. (LT 245 75 R16) I have to run these tires at 50 PSI or else when I am drivin...
Forum Discussion
Load range 'D' are 8 ply tires...LRD
Load range 'E' are 10 ply tires...LRE
Load range 'C' are 6 ply tires...LRC
There are even higher ply ratings along with their letter designations
The metric number reference the tires sizing....millimeters section width
75 is the aspect ratio in percentage vs 100% tall tire. Ranges from
80 down to 35's the last time I checked
R is a radial construction tire
16 is the tire's wheel dia
OEM tire's recommended tire rim width should be followed when re-engineering
a suspension/tire size. That is also the 'bead to bead' rim width and shady
sales will use the outside of the rim to sell you at a higher price
If the OP's description of it coming with LT245/75R16LRD tires (8 ply tires),
then they are illegal for any GM 2500HD. OEM from GM are LT245/75R16LRE,
a 10 ply tire. In other countries they actually boot a vehicle with
the wrong (lesser than OEM) components, fine the driver and even
fine/revoke/jail the dealer...but sadly not here and why we have such
a mess with too many dealers/customers
This general confusion has RMA (Rubber Manufacturers Association) in the long
process of changing from the 'ply' rating to the generic number code long used
on 'P' (passenger class) tires and most new LT tires today have both load range
coding and soon no more ply ratings (letter coding)
Note going too low PSI on any LT tire (unless floatation LT tires and
only off roading going SLOW) is dangerous as LT tires are NOT designed to be run low
Why 'P' class tires are on most all 'half ton' trucks/SUVs...mainly for ride
quality and they are cheaper than 'LT' class tires of the same OEM/Model/tread/Size. Of course 'half ton' trucks less than 8K GVWR
Load range 'E' are 10 ply tires...LRE
Load range 'C' are 6 ply tires...LRC
There are even higher ply ratings along with their letter designations
The metric number reference the tires sizing....millimeters section width
75 is the aspect ratio in percentage vs 100% tall tire. Ranges from
80 down to 35's the last time I checked
R is a radial construction tire
16 is the tire's wheel dia
OEM tire's recommended tire rim width should be followed when re-engineering
a suspension/tire size. That is also the 'bead to bead' rim width and shady
sales will use the outside of the rim to sell you at a higher price
If the OP's description of it coming with LT245/75R16LRD tires (8 ply tires),
then they are illegal for any GM 2500HD. OEM from GM are LT245/75R16LRE,
a 10 ply tire. In other countries they actually boot a vehicle with
the wrong (lesser than OEM) components, fine the driver and even
fine/revoke/jail the dealer...but sadly not here and why we have such
a mess with too many dealers/customers
This general confusion has RMA (Rubber Manufacturers Association) in the long
process of changing from the 'ply' rating to the generic number code long used
on 'P' (passenger class) tires and most new LT tires today have both load range
coding and soon no more ply ratings (letter coding)
Note going too low PSI on any LT tire (unless floatation LT tires and
only off roading going SLOW) is dangerous as LT tires are NOT designed to be run low
Why 'P' class tires are on most all 'half ton' trucks/SUVs...mainly for ride
quality and they are cheaper than 'LT' class tires of the same OEM/Model/tread/Size. Of course 'half ton' trucks less than 8K GVWR
