2018 Ram Chassis cab Wheel & Tire Sizes
Complete fitment guide for the 2018 Ram Chassis cab: factory tire sizes, compatible wheel diameters, widths and offsets, and the 8x275 bolt pattern — for every trim.
Bolt Pattern
8x275
Centre Bore
221 mm
Lug nuts
9/16" - 18 UNF
Wheel Diameters
17.5"–19.5"
Factory (OEM) Tire Sizes for the 2018 Ram Chassis cab
Click any size to shop tires in stock now — free shipping anywhere in Canada, optional installation at our 5 GTA locations.
2018 Ram Chassis cab Wheel Fitment by Trim
Compatible wheel diameter, width and offset ranges for each 2018 Ram Chassis cab configuration.
5.7 HEMI · Pickup
5.7L · V8 · Petrol
| Spec | Front & Rear |
|---|---|
| Wheel diameter | 17.5–19.5" |
| Wheel width | 6–6.8" |
| Wheel offset | 127–142 mm |
| Tire width | 225–245 mm |
6.4 HEMI · Pickup
6.4L · V8 · Petrol
| Spec | Front & Rear |
|---|---|
| Wheel diameter | 17.5–19.5" |
| Wheel width | 6–6.8" |
| Wheel offset | 127–142 mm |
| Tire width | 225–245 mm |
6.7 Cummins · Pickup
6.7L · I6 · Diesel
| Spec | Front & Rear |
|---|---|
| Wheel diameter | 17.5–19.5" |
| Wheel width | 6–6.8" |
| Wheel offset | 127–142 mm |
| Tire width | 225–245 mm |
2018 Ram Chassis cab Fitment FAQ
What is the bolt pattern on a 2018 Ram Chassis cab?
The 2018 Ram Chassis cab uses a 8x275 bolt pattern (8 lug nuts on a 275 mm circle) with a 221 mm centre bore.
What size tires fit a 2018 Ram Chassis cab?
Factory (OEM) tire sizes for the 2018 Ram Chassis cab include LT225/80R17.5, LT225/70R19.5, 245/70R19.5, LT245/70R19.5. Always confirm against the placard inside the driver's door jamb.
What wheel sizes can I put on a 2018 Ram Chassis cab?
Depending on trim, the 2018 Ram Chassis cab accepts wheels from 17.5" up to 19.5" in diameter with the correct width and offset — larger diameters typically require lower-profile tires to keep the overall rolling diameter stock.
What lug nut size does a 2018 Ram Chassis cab use?
The 2018 Ram Chassis cab uses 9/16" - 18 UNF lug nuts.
Fitment data is provided as a guide. Always verify sizes against your vehicle's door-jamb placard or with our fitment experts before ordering.