Wheel Sizes Bolt Pattern Lug Nut Sizes Wheel Offset Tire Sizes Tire Pressure Blog
Home Tires Compare Size 285/60 R18 vs 275/65 R18

Compare 285/60 R18 vs 275/65 R18

Tire Size and Comparison Calculator calculate tire diameter from code and compare speedometer differences for tire sizes.

The first number 285 is the tire width in millimeters.

The 2nd number 60 is used to calculate the sidewall height or "aspect ratio", by percentage. So, the sidewall height of a 285/60 R 18 tire is 60% of 285 = 192

The 3rd number 18 (generally preceded by an "R") is Rim Diameter in inches. This is the diameter of the rims bead seat base, not the diameter of the outer rim edge. The rim edge, or lip, extends past the tire bead seat to hold the bead and stop the tire slipping off the rim.

When we say a rim has a 18 inch diameter, we mean that the diameter of the bead seat base measures 18 inches. The outer rim edge diameter will actually measure more, depending on the design.

Tire 1
/ R
285
60
R18
Tire 2
/ R
275
65
R18

Odometer Reading

If you replace 320/60/18 with 235/60/18 for Odometer reading 1000 the actual distance traveled = 879 ~ (-12.1%)

(If your Odometer is accurate for original tires)

Edit and Copy Tire diagram above to compare or print.

Speedo Difference between Wheels 12.1%
320/60 R 18 KPH 235/60 R 18 KPH
5 4.4
10 8.8
15 13.2
20 17.6
25 22
30 26.4
35 30.8
40 35.1
45 39.5
50 43.9
55 48.3
60 52.7
65 57.1
70 61.5
75 65.9
80 70.3
85 74.7
90 79.1
95 83.5
100 87.9
105 92.3
110 96.7
115 101.1
120 105.4
125 109.8
130 114.2
135 118.6
140 123
145 127.4
150 131.8

Comparison Table

Model
285/60 R18
275/65 R18
Section Width
i

The TrueContact Tour is Continental's Standard Touring All-Season tire developed for drivers of family sedans, coupes, minivans and small

285 mm
275 mm
Sidewall Height
i

The TrueContact Tour is Continental's Standard Touring All-Season tire developed for drivers of family sedans, coupes, minivans and small

6.73"
7.04"
Overal Diameter
i

The TrueContact Tour is Continental's Standard Touring All-Season tire developed for drivers of family sedans, coupes, minivans and small

31.46mm
32.07mm
Rim Size
i

The TrueContact Tour is Continental's Standard Touring All-Season tire developed for drivers of family sedans, coupes, minivans and small

18x10.0, 18x10.5, 18x11.0
18x9.5, 18x10.0, 18x10.5
Circumference
i

The TrueContact Tour is Continental's Standard Touring All-Season tire developed for drivers of family sedans, coupes, minivans and small

98.83 "
100.75 "
Revs per mile
i

The TrueContact Tour is Continental's Standard Touring All-Season tire developed for drivers of family sedans, coupes, minivans and small

641.1/mi
628.88/mi
Speedometer
i

The TrueContact Tour is Continental's Standard Touring All-Season tire developed for drivers of family sedans, coupes, minivans and small

Considering this is the manufacturer’s tire size and speedometer readings are correct.
Note: speedometer's 60km/h actually mean 61 km/h
Car height
i

The TrueContact Tour is Continental's Standard Touring All-Season tire developed for drivers of family sedans, coupes, minivans and small

Basic
+7.7 mm
Typical Weight
i

The TrueContact Tour is Continental's Standard Touring All-Season tire developed for drivers of family sedans, coupes, minivans and small

43.6 kg
47.7 kg
Ground Clearance
i

The TrueContact Tour is Continental's Standard Touring All-Season tire developed for drivers of family sedans, coupes, minivans and small

Stock
+7.7 mm
Tire with the same height
i

The TrueContact Tour is Continental's Standard Touring All-Season tire developed for drivers of family sedans, coupes, minivans and small

Performance
Result
Impact
Design
Worsen
Your car is visually less appealing with less prominent disks and narrow tires. If you care about the looks of your vehicle, think about the size of your disks.
Road holding ability
Worsen
Insufficient road grip. The degree of improvement in traction is largely determined by the aspect ratio of the wheel. In addition, reducing the width of the tires increases the braking distance on dry pavement. This happens because the tire-to-road contact area is reduced.
Precision of steering response
Worsen
The steering is slow and the cornering is poor. If your rim diameter is smaller and your tire height is higher, for example, you'll have reduced control of your vehicle while cornering and also decrease the speed you can safely take such turns.
Grip on dry pavement
Worsen
The contact patch of narrower tires is reduced, reducing traction on dry pavement.
Grip on wet pavement
Enhance
A narrower tire, which can expel more water from underneath the wheel, improves braking performance on wet pavement.
Grip on dirty surfaces
Enhance
Enhanced grip on muddy roads. When driving on sandy or dirty roads, less contact area is almost directly proportional to less braking distance.
Hydroplaning resistance
Enhance
Hydroplaning resistance has been improved. The contact area of the road surface is smaller when the tire is higher and narrower. The tread does not need to expel as much water from beneath the wheel.
Ride comfort and noise
Enhance
Comfortable riding. Traveling on tires with a higher profile is more comfortable than on tires with a lower profile. Noise levels are reduced. A reduction in tire width nearly always reduces tire noise, but it depends on the tread compound and shape of the tire. Because of the reduced travel distance between the tread blocks, air moves faster between them.
Fuel consumption
Decrease
Fuel consumption is significantly reduced. The rolling resistance of narrower tires is lower, which reduces fuel consumption.
Treadwear
Enhance
Reduced risk of tire and rim damage. The sides of tires with a higher profile are less likely to be damaged than those with a low profile.
Cost
The same
Weight
Decrease
As a general rule, wheel weight contributes to the overall car weight. Heavier cars will be more difficult to accelerate and slow down when needed. You'll also consume more fuel as a result.

Popular comparisons

285/60 R18 VS

275/65 R18 VS


Amazon Associates Program

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
We may earn a commission from links that lead to the Amazon site.