255 40r20 diameter

Calculate

135145155165175185195205215225235245255265275285295305315325335345355365375385395	/	253035404550556065707580859095100	R	121314151617181920212222. 52324
New tire size

Results	Old	Difference
L - tire width, mm	{{ form.width }}	{{ form.c_width}}	{{ form.c_width-form.width}}
H - profile height, mm	{{ height_mm=form.width*form.height/100 | number : 0}}	{{ c_height_mm=form. c_width*form.c_height/100 | number : 0}}
d - inner diameter, mm	{{ diameter_mm=25.4*form.diametr | number : 0}}	{{ c_diametr_mm=25.4*form.c_diametr | number : 0}}	{{ c_diametr_mm-diametr_mm | number : 0}}
D - outside diameter, mm	{{ full_diametr_mm = diameter_mm + height_mm * 2 | number : 0}}	{{ delta_full_diametr_mm = c_full_diametr_mm - full_diametr_mm | number : 0}}
Change in ground clearance mm			{{ delta_full_diametr_mm / 2 | number : 0}}
Speedometer difference			{{ delta_full_diametr_mm / full_diametr_mm * 100 | number : 0 }} %

And it is desirable to start from the average value when changing the tire width when entering data into the tire calculator. For example, choosing tires for SUVs on most high-end crossovers such as the BMW X5, Porsche Cayenne, Volkswagen Touareg, Audi Q7, Subaru Tribeca, Volvo XC90, Range Rover Sport, etc. the average is the size 255/55 R18, and the factory interchangeable ones can be like a smaller landing one !!! size 235/65 R17 and 255/60 R17 and equivalent but narrower 235/60 R18 and 255/50 R19, 285/45 R19 in 19m diameter, 245/45 R20, 275/40 R20 and even 315/35 R20, and even 22 inch analogues of 285/30 R22. So for most passenger cars of the middle class, we replace the super popular size 205/55 R16 with sizes 195/65 R15 and 205/60 R15 with a decrease in the tire diameter, 195/60 R16 and 225/50 R16 if it is necessary to change the tire width, 205/50 R17 and 225/45 R17 for a lower tire profile, 225/40 R18 and 255/35 R18 for even more sporty behavior of the car and 225/35 R19 and 255/30 R19 respectivelyfor the most extreme. Wider tire options are designed to fit tires for rear-wheel drive Mercedes and BMW vehicles.

The inner, ie the rim diameter and the profile height of the tire are inversely proportional to each other and are the most "flexible" when selecting values. The lower the profile, the larger the landing diameter of the disk and vice versa. The main thing is to save the outer or full diameter of the wheel, which allows you to calculate the tire calculator. When reducing the diameter of the tire, a very important point must be taken into account - discs of a smaller diameter may simply not fit on the brake caliper. It is absolutely necessary to fit on your car (very important for the Germans even with an increase in diameter), since very often there were cases when the disc not only did not fit due to the large brake mechanism in general, but also could not lean against the hub due to insufficient convex disc. Even if a friend on the same slightly older or less powerful car has everything right, you cannot be sure that it will work on yours. Automakers are on the alert :) and constantly put sticks in the wheels, making changes to the design of the car :)

Increasing the width of the tire leads to better handling in corners and the possibility of passing these corners at higher speeds, reducing the braking distance on any surface (narrow tires for winter are a complete delusion, especially on hard surfaces). And the disadvantages of wide tires are increased fuel consumption, sharp reactions to ruts and other bumps on the roads. Increasing the diameter of the rim leads to a deterioration in comfort and increased rigidity, but allows you to make the car more sporty due to less removal (displacement) of the tread from the rims of the disc in the transverse direction in sharp and high-speed turns. nine0003

Increasing the tire width is always carried out by the car owner at his own peril and risk and cannot serve as a reason or reason for making claims to the store or technical center employees. All responsibility in this act lies with the car owner or his representative.

It should also be taken into account that the speed index and load index of a tire are usually higher for tires with a larger landing diameter and a lower profile, therefore, an increase in the landing diameter of the disc only has a positive effect on handling and grip quality, impairing only the comfort from shaking in the car. nine04008.59.51010.51111.512.51313.53132333795100

Diameter:

All 13C1314C1415.315C1516C1616.51717.517C18C1819.519C1920C202121C2222.5238

This rim selection calculator is used so that the customer himself can select rims for tires or tires for rims in width.

The width of the rim may vary for the same tires, unlike the diameter of the rim. This is due to the fact that the design of the cord does not prevent the rubber sidewalls of the tire from being slightly wider or already within acceptable limits (for example, on the BMW E39the manufacturer put 225 tires on 16 rims 7 inches wide, and on the Mercedes W210 at the same time the factory installed 215 tires on 16 rims 7. 5 inches wide with the same profile height of 55%; at the same time, the parameters of 17 tires and disks on these two models coincided completely). But the steel side rings, which determine the diameter and are responsible for the tight and hermetic fit of the tire on the disk, do not allow such liberties.

When mounted on discs that are too wide for these tires, the tire will stand on them with a "house" - this is not very beautiful (in the context it will look like a trapezoid), the disc will be wider than rubber and will receive damage on every curb or stone on the road. And most importantly, the area of ​​​​contact of the tread plane with the road will decrease. nine0168 When tires are installed on disks that are too narrow for them, the tires will bend along their entire length like a cobra's hood. This is completely unacceptable. In addition to a reduced contact patch and increased wear of the central part of the tire tread, irreversible deformation of the steel cord of the tire will inevitably begin.

When choosing wheels for a car, it is necessary to take into account the offset of the disk, that is, the displacement relative to the hub to the outside of the car, which does not allow this disk calculator to be made. When installing new discs, they must be fitted before mounting the tires. This is an inexpensive, but very responsible operation according to the principle of measuring seven times, even more necessary than trying on shoes of your size before buying in a store, since the metal does not wear out over time, but must fit right away. The diversity of the shape of the calipers of modern cars and the inner surface of the entire diverse range of rims does not allow you to rely on any one catalog. nine0003

When you change the full diameter of the wheel, the speedometer readings will change in the percentage that our car tire calculator shows. With an increase in diameter of more than 1.5%, it is likely that the use of automobile chains for snow or mud cover will become impossible.

The selection of tires of a larger width with this calculator does not eliminate the need for a mandatory fitting of disks, since there are frequent cases of using disks with the wrong offset, due to which the entire wheel can protrude outward and cling to the fender on potholes or bumps, or simply splatter the car with mud. It is also recommended to check a fully loaded car before leaving the technical center when installing wide tires or reducing the offset of the disks to eliminate friction on the suspension parts or the wings of the car. Studded tires require double attention when experimenting with selection, as they are capable of sawing any wing very quickly just like a milling cutter. nine0003

Off-Road Tire Size Chart

Tire and wheel size matching is an important step towards safety and driving comfort for any driver. A frivolous attitude to this issue is fraught with serious consequences, both for the technical condition of the vehicle, and for the health and life of drivers and passengers. Consider this problem on SUVs, crossovers or pickup trucks of various classes. Of course, here the size range is not so large, which makes it easier to select discs for tires. To begin with, it is worth recalling what indicators are important when deciding whether tires and wheels match:

Wheel marking with dimensions R13 4x98 ET35 J5 D58.6

The table below shows almost all off-road vehicle wheel sizes. We remind you that on our website there is also an option for selecting wheels by car brand . Also on our website there is similar information regarding passenger cars .

Tire/rim matching chart

Wheel diameter	Tire size	Wheel rim width (inches)
		Minimum	Recommended	Maximum
16"	7. 50R16	5.50	6.00	6.50
	235/85R16	6.0	6.5	7.5
15"	195/80R15	5.0	5.5	6.5
	215/80R15	5.5	6.0	7.0
16"	205/80R16	5.0	5.5	7.0
	215/80R16	5.5	6.0	7.0
15"	215/75R15	5.5	6. 0	7.0
	225/75R15	6.0	6.0	7.5
	235/75R15	6.0	6.5	8.0
	255/75R15	6.5	7.0	8.5
16"	225/75R16	6.0	6.0	7.5
15"	195/70R15	5.0	6.0	6.5
	205/70R15	5.0	6.0	7.0
	265/70R15	7. 0	8.0	9.0
16"	215/70R16	5.5	6.5	7.0
	225/70R16	6.0	6.5	7.5
	235/70R16	7.0	8.0
	245/70R16	6.5	7.0	8.0
	265/70R16	7.0	8.0	9.0
	275/70R16	7.0	8.0	9.0
17"	225/70R17	6. 0	6.5	7.5
	265/70R17	7.0	8.0	9.0
15"	185/65R15	5.0	5.5	6.5
16"	215/65R16	6.0	7.5
	255/65R16	7.0	7.5	9.0
17"	235/65R17	6.5	7.0	8.5
	245/65R17	7.0	7.0	8.5
	265/65R17	7. 5	8.0	9.5
	275/65R17	7.5	8.0	9.5
16"	215/60R16	6.0	6.5	7.5
	236/60R16	6.5	7.0	8.5
18"	235/60R18	6.5	7.0	8.5
	275/60R18	7.5	8.0	9.5
	285/60R18	8.0	8.5	10.0
17"	225/55R17	7.0	8.0
	235/55R17	6.5	7.5	8.5
	275/55R17	7.5	8.5	9.5
18"	255/55R18	7.0	8.0	9.0
19"	255/55R19	7.0	8.0	9.0
	275/55R19	7.5	8.5	9.5
	285/55R19	8.0	9.0	10.0
17"	255/50R17	7. 0	9.0
18"	235/50R18	6.5	7.5	8.5
	285/50R18	8.0	9.0	10.0
19"	255/50R19	7.0	8.0	9.0
20"	255/50R20	7.0	8.0	9.0
	275/50R20	7.5	8.5	9.5
18"	255/45R18	8.0	8.5	9. 5
19"	235/45R19	7.5	8.0	9.0
	275/45R19	8.5	9.0	10.5
	285/45R19	9.0	9.5	10.5
20"	265/45R20	8.5	9.0	10.0
19"	255/40R19	8.5	9.0	10.0
20"	275/40R20	9.0	9.5	11.0
20"	315/35R20	10. 5	11.0	12.5
21"	285/35R21	9.5	10.0	11.0
22"	285/35R22	9.5	10.0	11.0
21"	325/30R21	11.5	11.5	13.0
22"	295/30R22	10.5	10.5	11.5

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