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Tyre size checker

255/40 R19 tyre size

Dimensions, overall diameter and alternatives for 255/40 R19 tyres.

A 255/40 R19 tyre is 255 mm wide with a sidewall 40% of its width (102 mm) on a 19 inch wheel. Its overall diameter is 686.6 mm (27.03 in), its circumference is 2,157 mm and it turns about 746 times per mile.

Find your tyre size by reg

Enter your registration number to see the tyre sizes your car left the factory with.

Could not read that size. Try e.g. 225/45R17

It is printed after the size on the sidewall, for example 205/55 R16 91V. You can also type the full code into the size field above.

Maximum speed

Speed symbol not recognised.

Maximum load

Load index not recognised.

About kg across a set of four.

The speed rating is the speed the tyre is tested for, not a legal limit. The UK maximum is 70 mph. Replacement tyres should meet or exceed the load index and speed rating in your vehicle handbook.

Diameter difference

Speedometer reads 60 mph, you are doing

255/40 R19 tyre dimensions

Section width255 mm
Aspect ratio40%
Rim diameter19 in (482.6 mm)
Sidewall height102.0 mm
Overall diameter686.6 mm (27.03 in)
Circumference2,157 mm
Revolutions per mile746

Sizes similar to 255/40 R19

Common sizes within 3% of the overall diameter. Check your handbook and tyre ratings before changing size.

Tyre speed rating chart

The letter after the load index is the speed symbol: the top speed the tyre is built and tested for. In the UK the national speed limit is 70 mph, so ratings are about safety margin and vehicle approval, not permission to go faster.

Tyre speed symbols with maximum speed in km/h and mph
SymbolMax speed (km/h)Max speed (mph)
J 100 62
K 110 68
L 120 75
M 130 81
N 140 87
P 150 93
Q 160 99
R 170 106
S 180 112
T 190 118
U 200 124
H 210 130
V 240 149
W 270 168
Y 300 186

Tyre load index chart

The number before the speed symbol is the load index, which maps to the maximum weight one tyre can carry. For example, index 91 carries 615 kg per tyre.

Show the full load index table (60 to 120)
IndexMax load
60250 kg
61257 kg
62265 kg
63272 kg
64280 kg
65290 kg
66300 kg
67307 kg
68315 kg
69325 kg
70335 kg
71345 kg
72355 kg
73365 kg
74375 kg
75387 kg
76400 kg
77412 kg
78425 kg
79437 kg
80450 kg
IndexMax load
81462 kg
82475 kg
83487 kg
84500 kg
85515 kg
86530 kg
87545 kg
88560 kg
89580 kg
90600 kg
91615 kg
92630 kg
93650 kg
94670 kg
95690 kg
96710 kg
97730 kg
98750 kg
99775 kg
100800 kg
101825 kg
IndexMax load
102850 kg
103875 kg
104900 kg
105925 kg
106950 kg
107975 kg
1081,000 kg
1091,030 kg
1101,060 kg
1111,090 kg
1121,120 kg
1131,150 kg
1141,180 kg
1151,215 kg
1161,250 kg
1171,285 kg
1181,320 kg
1191,360 kg
1201,400 kg

Popular tyre sizes

Frequently asked questions

What speed rating and load index do 255/40 R19 tyres have?

The size alone does not set them. 255/40 R19 tyres are sold with a range of load indexes and speed ratings, printed after the size, for example 255/40 R19 75T means load index 75 (387 kg per tyre) and speed rating T (190 km/h, 118 mph). Enter the code in the calculator above to decode yours.

What is the overall diameter of a 255/40 R19 tyre?

A 255/40 R19 tyre has an overall diameter of 686.6 mm (27.03 inches) and a circumference of 2,157 mm. It turns about 746 times per mile.

What does 255/40 R19 mean?

255/40 R19 describes a tyre 255 mm wide with a sidewall that is 40% of that width (102 mm), fitted to a 19 inch wheel.

What tyre sizes are similar to 255/40 R19?

Sizes within the 3% diameter guideline of 255/40 R19 include 215/65 R16, 235/60 R16, 225/55 R17, 245/40 R19. Always check your vehicle handbook and tyre load and speed ratings before changing size.

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