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Because the specifications on the OEM wheels and tires are not neatly organized in one location, here is a summary that I complied that can be used for reference. Credit for the diagrams to www.autoanything.com
Wheel Offset:
The SSR has positive offset on both front and rear wheels
This means that the mounting face of the hub is offset towards the outside of the truck relative to the centerline of the wheel (most current factory wheels have some positive offset)
Wheel Backspacing:
The distance from the back face of the mounting hub to the rear of the wheel (with a straightedge across the rear flange)
Front Wheels
Size= 8J19xET32
Stamped 19x8.0Jx32
Wheel Diameter= 19 inches
Wheel width measured inside the flanges= 8.0 inches
J= Wheel Mounting Flange Style
32 or ET 32= 32mm positive offset
ET=Einpresstiefe or offset
Backspacing= 5-3/4 inches
Hub (Center Bore) Pitch Circle Diameter= 78.3 mm
Bolt Pattern=6 (Lugs) x 127mm (Bolt Circle Diameter)
Bolt Threads= M12x1.5
Rear Wheels
Size= 10Jx20ET14
Stamped 20x10Jx14
Wheel Diameter= 20 inches
Wheel width measured inside the flanges= 10 inches
J= Wheel Mounting Flange Style
14 or ET14= 14mm positive offset
ET=Einpresstiefe or offset
Backspacing= 6-1/8 inches
Hub (Center Bore) Pitch Circle Diameter= 78.3mm
Bolt Pattern=6 (Lugs) x 127mm (Bolt Circle Diameter)
Bolt Threads= M12x1.5
Goodyear Eagle RS-A OEM Tire Specifications
Front Tires
Size: P255-45R19
Load Rating: 100H
Maximum Load: 1764 pounds
GM Tire Performance Criteria (TPC Spec): 1221MS
Tire Inflation Pressure (cold): 30psi
UTQ Grade: 260AA
Outside Diameter: 28.1 inches
Section Width: 10.0 inches
Revolutions/Mile: 745
Rear Tires
Size: P295-40R20
Load Rating: 106H
Maximum Load: 2094 pounds
GM Tire Performance Criteria (TPC Spec): 1222MS
Tire Inflation Pressure (cold): 30psi
UTQ Grade: 260AA
Outside Diameter: 29.3 inches
Section Width: 11.7 inches
Revolutions/Mile: 714
Wheel Offset:
The SSR has positive offset on both front and rear wheels
This means that the mounting face of the hub is offset towards the outside of the truck relative to the centerline of the wheel (most current factory wheels have some positive offset)
Wheel Backspacing:
The distance from the back face of the mounting hub to the rear of the wheel (with a straightedge across the rear flange)
Front Wheels
Size= 8J19xET32
Stamped 19x8.0Jx32
Wheel Diameter= 19 inches
Wheel width measured inside the flanges= 8.0 inches
J= Wheel Mounting Flange Style
32 or ET 32= 32mm positive offset
ET=Einpresstiefe or offset
Backspacing= 5-3/4 inches
Hub (Center Bore) Pitch Circle Diameter= 78.3 mm
Bolt Pattern=6 (Lugs) x 127mm (Bolt Circle Diameter)
Bolt Threads= M12x1.5
Rear Wheels
Size= 10Jx20ET14
Stamped 20x10Jx14
Wheel Diameter= 20 inches
Wheel width measured inside the flanges= 10 inches
J= Wheel Mounting Flange Style
14 or ET14= 14mm positive offset
ET=Einpresstiefe or offset
Backspacing= 6-1/8 inches
Hub (Center Bore) Pitch Circle Diameter= 78.3mm
Bolt Pattern=6 (Lugs) x 127mm (Bolt Circle Diameter)
Bolt Threads= M12x1.5
Goodyear Eagle RS-A OEM Tire Specifications
Front Tires
Size: P255-45R19
Load Rating: 100H
Maximum Load: 1764 pounds
GM Tire Performance Criteria (TPC Spec): 1221MS
Tire Inflation Pressure (cold): 30psi
UTQ Grade: 260AA
Outside Diameter: 28.1 inches
Section Width: 10.0 inches
Revolutions/Mile: 745
Rear Tires
Size: P295-40R20
Load Rating: 106H
Maximum Load: 2094 pounds
GM Tire Performance Criteria (TPC Spec): 1222MS
Tire Inflation Pressure (cold): 30psi
UTQ Grade: 260AA
Outside Diameter: 29.3 inches
Section Width: 11.7 inches
Revolutions/Mile: 714
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