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EnglishWheels and tires -> Tire inflation pressure for your BMW i8 2014-2020
Wheels and tires
MOBILITY
Wheels and tires
Tire inflation pressure specifications
In the tire inflation pressure table
Vehicle features and options
This chapter describes all standard, country-spe‐
cific and optional features offered with the series.
It also describes features that are not necessarily
available in your vehicle, for instance, due to the
selected options or country versions. This also
applies to safety-related functions and systems.
When using these functions and systems, the
applicable laws and regulations must be ob‐
served.
The tire inflation pressure table, refer to
page 207, contains all tire inflation pressure
specifications for the specified tire sizes at the
ambient temperature. The tire inflation pressure
values apply to tire sizes approved by the manu‐
facturer of the vehicle for the vehicle type.
To identify the correct tire inflation pressure,
please note the following:
▷ Tire sizes of your vehicle.
▷ Maximum permitted driving speed.
Tire inflation pressure
Checking the tire inflation pressure
General information
Tires heat up while driving. The tire inflation
pressure increases with the tire temperature.
General information
The tire inflation pressure and tire characteristics
influence the following:
▷ The service life of the tires.
▷ Road safety.
Tires have a natural, consistent loss of tire infla‐
tion pressure.
▷ Driving comfort.
▷ Driving dynamics.
▷ Fuel consumption.
The displays of inflation devices may under-read
by up to 0.1 bar/2 psi.
Checking using tire inflation pressure
specifications in the tire inflation pressure
table
The tire inflation pressure specifications in the
tire inflation pressure table only relate to cold
tires or tires at the same temperature as the am‐
bient temperature.
Safety information
Warning
A tire with too little or no tire inflation pressure
may heat up significantly and sustain damage.
This will have a negative impact on aspects of
handling, such as steering and braking re‐
sponse. There is a risk of accident. Regularly
check the tire inflation pressure, and correct it
as needed, for instance twice a month and be‐
fore a long trip.
Only check the tire inflation pressure levels when
the tires are cold, i.e.:
▷ Driving range of max. 1.25 miles/2 km has not
been exceeded.
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Wheels and tires
MOBILITY
▷ If the vehicle has not moved again for at least
2 hours after a trip.
Tire inflation pressure values up to
100 mph/160 km/h
1. Determine the intended tire inflation pressure
levels for the mounted tires.
i8 Coupe
2. Check the tire inflation pressure in all four
tires, using a pressure gage, for example.
Tire size
Pressure specifications in
bar/PSI
3. Correct the tire inflation pressure if the actual
tire inflation pressure deviates from the in‐
tended tire inflation pressure.
Specifications in
bar/PSI with
cold tires
4. Check whether all valve caps are screwed
onto the tire valves.
215/45 R 20 95 2.2 / 32
V XL M+S
2.2 / 32
After correcting the tire inflation pressure
For run-flat tires: reinitialize run-flat tires.
Front: 195/50 R 2.2 / 32
20 93 W XL
-
For the Tire Pressure Monitor TPM: reset the
Tire Pressure Monitor TPM.
Rear: 215/45 R
20 95 W XL
-
2.2 / 32
-
Tire inflation pressures up to
100 mph/160 km/h
For speeds of up to 100 mph/160 km/h and for
optimum driving comfort, note the tire inflation
pressure values in the tire inflation pressure ta‐
ble, refer to page 207, and adjust as necessary.
Front: 215/45 R 2.2 / 32
20 95 W XL
Rear: 245/40 R
20 99 W XL
-
2.2 / 32
Tire inflation pressures at max.
speeds above 100 mph/160 km/h
Warning
In order to drive at maximum speeds in excess
of 100 mph/160 km/h, please observe, and, if
necessary, adjust tire pressures for speeds ex‐
ceeding 100 mph/160 km/h from the relevant
table on the following pages. Otherwise, tire
damage and accidents could occur.
These tire inflation pressure values can also be
found on the tire inflation pressure label on the
driver's door pillar.
For speeds over 100 mph/160 km/h and for opti‐
mum driving comfort, note the pressure values in
the tire inflation pressure table, refer to
Do not exceed a speed of 100 mph/160 km/h.
page 208, and adjust as necessary.
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Wheels and tires
MOBILITY
Locate the maximum tire load on the tire sidewall
and the Gross Axle Weight Rating – GAWR – on
the certification label on the driver’s door pillar.
Tire inflation pressure values over
100 mph/160 km/h
Divide the tire load by 1.1. It must be greater
than one-half of the vehicle’s Gross Axle Weight
Rating – GAWR. Note, front vs. rear GAWR and
tire loads, respectively.
i8 Coupe
Tire size
Pressure specifications in
bar/PSI
Specifications in
bar/PSI with
cold tires
Speed letter
Designation
Maximum speed
Q
R:
S
up to 100 mph/160 km/h
up to 106 mph/170 km/h
up to 112 mph/180 km/h
up to 118 mph/190 km/h
up to 131 mph/210 km/h
up to 150 mph/240 km/h
up to 167 mph/270 km/h
up to 186 mph/300 km/h
215/45 R 20 95 2.3 / 33
V XL M+S
2.8 / 41
Front: 215/45 R 2.3 / 33
20 95 W XL
-
T
Rear: 245/40 R
20 99 W XL
-
2.8 / 41
-
H
V
Front: 195/50 R 2.5 / 36
20 93 W XL
W
Y
Rear: 215/45 R
20 95 W XL
-
3.0 / 44
Tire Identification Number
DOT code: DOT xxxx xxx 3819
xxxx: manufacturer code for the tire brand
xxx: tire size and tire design
3819: tire age
Tire identification marks
Tire size
245/45 R 18 96 Y
Tires with DOT codes meet the guidelines of the
U.S. Department of Transportation.
245: nominal width in mm
45: aspect ratio in %
R: radial tire code
Tire age
18: rim diameter in inches
96: load rating, not for ZR tires
Y: speed rating, before the R on ZR tires
Recommendation
Regardless of the tire tread, replace tires at least
every 6 years.
Maximum tire load
Maximum tire load is the maximum permissible
weight for which the tire is approved.
Manufacture date
You can find the manufacture date of the tire on
the tire's sidewall.
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