OUTILS PRATIQUES

INDICES DE CHARGE

L’indice de charge est un chiffre pouvant être accompagné d’une lettre, dans le code du pneu, ex: 215/65R16 98T

COMPARATEUR

Choose units

Section Width / Aspect Ratio - Rim Diameter X Rim Width ET Offset

Assuming that this is OE wheel/tire Adjust replacement parameters here

Section Width / Aspect Ratio - Rim Diameter X Rim Width ET Offset

Assuming that this is OE wheel/tire Adjust replacement parameters here

Specify your parameters

Fender clearance

Wheel wells clearance

Suspension clearance

Scrub Radius

Plus Sizing	195 mm	205 mm	215 mm	225 mm	235 mm
16 " plus zero	195/60R16 195/60R16 x 6 ET44 +1.3 % 195/65R16 195/65R16 x 6 ET40 +4.4 % 195/50R16 195/50R16 x 6.5 ET50 -4.8 % 195/55R16 195/55R16 x 6.5 ET47 -1.9 %	205/50R16 205/50R16 x 6.5 ET49 -3.5 % 205/55R16 205/55R16 x 6.5 ET45 OE 205/60R16 205/60R16 x 6.5 ET41 +3.2 %	215/50R16 215/50R16 x 7 ET47 -1.6 % 215/55R16 215/55R16 x 7 ET43 +1.6 %	225/50R16 225/50R16 x 7.5 ET45 -0.3 % 225/55R16 225/55R16 x 7.5 ET41 +3.5 % 225/45R16 225/45R16 x 8 ET49 -3.8 %	235/50R16 235/50R16 x 7.5 ET43 +1.6 %
17 " plus one	195/55R17 195/55R17 x 6.5 ET42 +2.2 % 195/45R17 195/45R17 x 7 ET49 -3.8 %	205/50R17 205/50R17 x 6.5 ET44 +0.6 % 205/55R17 205/55R17 x 6.5 ET40 +4.1 % 205/45R17 205/45R17 x 7 ET48 -2.5 %	215/50R17 215/50R17 x 7 ET42 +2.5 % 215/45R17 215/45R17 x 7.5 ET46 -0.9 % 215/40R17 215/40R17 x 8 ET50 -4.4 %	225/50R17 225/50R17 x 7.5 ET41 +3.8 % 225/40R17 225/40R17 x 8 ET49 -3.2 % 225/45R17 225/45R17 x 8 ET45 +0.3 %	235/45R17 235/45R17 x 8 ET43 +1.9 % 235/40R17 235/40R17 x 8.5 ET47 -1.9 %
18 " plus two		205/40R18 205/40R18 x 7.5 ET47 -1.7 %	215/45R18 215/45R18 x 7.5 ET42 +3.0 % 215/35R18 215/35R18 x 8 ET50 -4.0 % 215/40R18 215/40R18 x 8 ET46 -0.5 %	225/35R18 225/35R18 x 8 ET48 -2.7 % 225/40R18 225/40R18 x 8 ET44 +0.8 % 225/45R18 225/45R18 x 8 ET40 +4.3 %	235/35R18 235/35R18 x 8.5 ET47 -1.7 % 235/40R18 235/40R18 x 8.5 ET43 +2.1 %
Original equipment (OE) wheel/tire size Recommended alternatives Optional alternatives

Minus Sizing

Comparison

Rims

Rim 1 (16x6.5 ET 45)

Rim 2 (17x7.5 ET 40)

Rim Diameter

406 mm %

432 mm ⬈ 6%

Rim Width

165 mm %

191 mm ⬈ 15%

Backspace

140 mm %

148 mm ⬈ 5%

Offset

45 mm %

40 mm ⬊ 11%

Typical Weight

7.7 kg %

10 kg ⬈ 30%

Tires

Tire 1 (205/55 R16)

Tire 2 (225/45 R17)

Section Width

205 mm %

225 mm ⬈ 10%

Sidewall

113 mm %

101 mm ⬊ 10%

Overall Diameter

632 mm %

634 mm ⬈ 0.4%

Rim Sizes

16x6 16x6.5 16x7 16x7.5 16x8

17x7.5 17x8 17x8.5

Circumference

1985 mm %

1993 mm ⬈ 0.4%

Revs per mile

811 %

808 ⬊ 0.4%

Speedometer

Assuming that this is OE tire and speedometer readings are correct %

When speedometer reads 60 km/h actual speed will be 60.2 km/h %

Typical Weight

9.8 kg %

10 kg ⬈ 1.6%

Rim + Tire Weight

17.5 kg %

20 kg ⬈ 14%

Clearance

Wheel 1

Wheel 2

Suspension

Assuming that this is OE wheel/tire and there are no any problems with clearance on both sides %

Tire is 5 mm closer to suspension components. Rim is 8 mm closer to suspension components. Acceptable for most cars %

Fenders

Assuming that this is OE wheel/tire and there are no any problems with clearance on both sides %

The tire will stick out 15 mm farther. Rim will stick out 18 mm farther. Make sure that you have enough room under the fender. If not, consider narrower tires or higher offset %

Wheel Wells

Assuming that this is OE wheel/tire and there are no any problems with clearance on both sides %

The same %

Brakes

Assuming that this is OE wheel/tire and there are no any problems with clearance on both sides %

100% clear (leaves even more room than OE) %

Scrub Radius

Zero scrub radius (zero value is assumed by default) %

Positive scrub radius (about 5 mm). Almost no difference. Please be aware that calculated value is approximate. %

Car Performance

Measurements Changes
Rim Diameter ⬈ Increase	Tire Width ⬈ Increase	Tire's Profile ⬊ Decrease	Rim Width ⬈ Increase	Overall Diameter ⬈ Increase
Performance Consequences
Design	⬈ Improve	Improved aesthetics. Larger discs and wider tires, as a rule, improve the visible appearance of your vehicle.
Road holding ability	⬈ Improve	Better traction. The degree of improvement in the traction largely depends on the aspect ratio of the wheel. In addition, increasing your tires' width shortens the braking distance on dry pavement thanks to the increased contact area between the tire and the road surface. Increasing the rim diameter makes it possible to accommodate larger car brake discs and calipers with a greater number of pistons. Such additions significantly improve the effectiveness of a car's braking system.
Precision of steering response	⬈ Improve	Improved steering response and behavior on turns. For example, an increased rim diameter, combined with a smaller tire height, will improve the car's stability on corners, as well as increasing the speed such corners can be safely undertaken.
Grip on dry pavement	⬈ Improve	Wider tires increase the contact patch and obviously improve the traction on dry pavement.
Grip on wet pavement	⬊ Worsen	Wider tires worsen the braking performance on wet pavement because they cannot expel the water from beneath the wheel as effectively as narrow tires.
Grip on dirty surfaces	⬊ Worsen	Reduced grip on dirty roads. The increase of the contact area is almost directly proportional to the increase in the braking distance when it comes to sandy or dirty roads.
Hydroplaning resistance	⬊ Worsen	Reduced hydroplaning resistance. A lower and wider tire creates a larger contact area with the road surface. This increases the quantity of water that the tread needs to expel from beneath the wheel. Tire makers try to counteract this by using directional treads or, as is becoming increasingly more common, asymmetric treads, in which two halves of the tread can be designed independently of each other, so as to fulfill different requirements.
Ride comfort and noise	⬊ Worsen	Low riding comfort. Reducing the tire height makes traveling less comfortable than on tires with a higher profile. Increased noise levels. This depends on the shape and type of the tread compound, but increasing the width of a tire nearly always brings about an increase in noise. This is because the air moving between the tread blocks has an increased travel distance.
Fuel consumption	⬈ Increase	Reduced fuel consumption. Narrower tires have a lower rolling resistance, which reduces the amount of fuel consumed.
Treadwear	⬈ Increase	Lower probability of damage to the tires and rims. Tires with a higher profile suffer damage to their sides less often than low profile tires.
Cost	⬈ Increase	Smaller diameter wheels and taller tires are less expensive than larger diameter wheels and low profile tires.
Weight	⬈ Increase	Generally speaking, wheel weight becomes a part of your vehicle's overall weight. Cars that are lighter will have an easier time picking up speed and are easier to slow down when needed. It also has a positive effect on overall fuel consumption.

450-634-2020

OUTILS PRATIQUES

INDICES DE CHARGE

COMPARATEUR

Minus Sizing

Comparison

Car Performance

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