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Home Tires Compare Size 205/55 R16 vs 205/55 R18

Compare 205/55 R16 vs 205/55 R18

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

The first number 205 is the tire width in millimeters.

The 2nd number 55 is used to calculate the sidewall height or "aspect ratio", by percentage. So, the sidewall height of a 205/55 R 16 tire is 60% of 205 = 192

The 3rd number 16 (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 16 inch diameter, we mean that the diameter of the bead seat base measures 16 inches. The outer rim edge diameter will actually measure more, depending on the design.

Tire 1
/ R
205
55
R16
Tire 2
/ R
205
55
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
205/55 R16
205/55 R18
Tread Photos
i

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

205/55 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

205 mm
205 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

4.44"
4.44"
Overal Diameter
i

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

24.88mm
26.88mm
Rim Size
i

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

16x6.0, 16x6.5, 16x7.0
18x6.0, 18x6.5, 18x7.0
Circumference
i

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

78.16 "
84.44 "
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

810.64/mi
750.36/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 65 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
+25.4 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

20.6 kg
0 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
+25.4 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
The same
Road holding ability
The same
Precision of steering response
The same
Grip on dry pavement
The same
Grip on wet pavement
The same
Grip on dirty surfaces
The same
Hydroplaning resistance
The same
Ride comfort and noise
The same
Fuel consumption
The same
Treadwear
The same
Cost
Increase
Larger diameter wheels and low profile tires are more expensive than smaller diameter wheels and taller tires.
Weight
Increase
Generally, wheel weight is included in the overall weight of your vehicle. Cars that are lighter will be able to accelerate more easily and slow down more easily when necessary. They will also consume less fuel overall.

Popular comparisons

205/55 R16 VS

205/55 R18 VS

205/55 R18

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