Tire 1
/ R
245
55
R18
Tire 2
/ R
245
50
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

Section Width
i

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

245 mm
245 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

5.31"
4.82"
Overal Diameter
i

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

28.61mm
27.65mm
Rim Size
i

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

Circumference
i

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

89.88 "
86.86 "
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

704.94/mi
729.45/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 58 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
-12.2 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

29.7 kg
32.3 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
-12.2 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
Enhance
The steering response and behavior during turns will be improved. For instance, adding a larger rim diameter and a smaller tire height can enhance cornering stability and also increase the speed at which such turns can be safely executed.
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
Worsen
Tires and rims are more likely to be damaged. The lower the tire height, the greater the risk of damaging the rim or tire itself when driving over potholes and other road imperfections. Low-profile tires are more prone to side damage.
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.

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