Tire 1
/ R
185
55
R16
Tire 2
/ R
195
50
R16

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

185 mm
195 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

4.01"
3.84"
Overal Diameter
i

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

24.01mm
23.68mm
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

75.43 "
74.39 "
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

839.98/mi
851.73/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 59 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
-4.2 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

17.6 kg
18.1 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
-4.2 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
Enhance
Enhanced design. The visual appearance of your car is usually improved by wider rims and wider tires.
Road holding ability
Enhance
Improved traction. Wheel aspect ratio plays a critical role in determining the degree of traction. Increasing the width of your tires also reduces braking distance on dry pavement due to the increased area of contact between the tire and the road surface. The larger rim diameter allows for larger car brake discs and calipers with more pistons. These additions enhance the effectiveness of a car's braking system significantly.
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
Enhance
In dry conditions, wide tires increase the contact patch and increase traction.
Grip on wet pavement
Worsen
On wet pavement, wider tires make braking less effective because they cannot expel the water from under the wheel as effectively as narrow tires.
Grip on dirty surfaces
Worsen
On muddy roads, the grip is reduced. When it comes to sandy or slippery roads, the increase in the contact area is almost directly proportional to the increase in braking distance.
Hydroplaning resistance
Worsen
Hydroplaning resistance is reduced. Tires with a lower and wider profile create a larger contact area with the road surface. The tread needs to expel more water from underneath the wheel as a result. It is for this reason that tire manufacturers use directional treads or, as has become increasingly common, asymmetric treads, in which the two halves of the tread can be designed independently of one another.
Ride comfort and noise
Worsen
The ride is uncomfortable. Tires with a lower profile make travel less comfortable than tires with a higher profile. The result is increased noise. Increasing the width of a tire almost always increases the noise, depending on the tread compound and the tire shape. There is an increased travel distance between the tread blocks because air moves between them.
Fuel consumption
Increase
A higher fuel consumption. Fuel consumption is increased by wider tires due to their higher rolling resistance.
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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