315/35R18 tire size
A 315/35R18 tire stands 26.7 inches tall and 12.4 inches wide, with a 4.3-inch sidewall on an 18-inch rim.
- Overall height
- 26.7 in678 mm
- Section width
- 12.4 in315 mm
- Sidewall height
- 4.3 in110 mm
- Rim diameter
- 18 in457 mm
- Circumference
- 83.8 in2129 mm
- Revolutions per mile
- 756470 per km
- Inch size
- 26.7x12.4R18
Compare it with any other size in the tire size calculator.
Sizes you can swap to
These 18-inch sizes are within two width steps and 3% of a 315/35R18's overall height, the usual limit before the speedometer, ABS and transmission notice. The closest is 305/35R18, 1.0% shorter (0.28 in). Wider sizes also need room in the wheel well and a rim width that suits them.
Plus and minus sizes
Changing rim size means changing the sidewall to keep the same overall height. On 16-inch or 17-inch or 19-inch rims, these are the closest matches to a 315/35R18.
Other 18-inch sizes near 315/35R18
315 mm wide, other sidewalls
35 series, other widths
See the other sizes for this rim on 18-inch tire sizes.
Shop 315/35R18 tires
These open each store's own list of 315/35R18 tires, where you can filter by type, load and speed rating.
315/35R18 questions
How tall is a 315/35R18 tire?
About 26.7 inches (678 mm) from the ground to the top of the tread, unloaded. On the vehicle, carrying weight, it sits a little lower.
What does 315/35R18 mean?
315 is the section width in millimetres (12.4 in). 35 means the sidewall is 35% of that width: 110 mm, or 4.3 in. R means radial construction, and 18 is the rim diameter in inches.
Can I use 305/35R18 instead of 315/35R18?
305/35R18 is 1.0% shorter (0.28 in) and 10 mm narrower, which is inside the usual 3% rule. With it fitted, the speedometer shows 60 mph when you are doing 59.4 mph.
What is 315/35R18 in inches?
In inch terms it is 26.7x12.4R18: 26.7 inches tall, 12.4 inches wide, for an 18-inch rim.
How many revolutions per mile does a 315/35R18 make?
About 756 turns per mile, worked out from its unloaded circumference of 83.8 inches. Makers list slightly higher numbers for their own tires, because a loaded tire rolls on a smaller radius.