Dutton · Sierra Drop Head · Recommended

Dutton Sierra Drop Head recommended cold inflation

Drivetrain: rear-wheel drive
Body: pickup / double-cab
PSI F / R: 32-35 / 32-35
Bar F / R: 2.2-2.4 / 2.2-2.4

psi

34 / 34

Catalogue mid-points, front / rear · 2.2-2.4 / 2.2-2.4 bar

32-35 psi F · 32-35 psi R · 2.2-2.4 / 2.2-2.4 bar · 231/231 kPa

Treat this page as a map of the Sierra Drop Head band. The legal setpoint is the printed door-pillar label for your VIN. Under-inflation cooks the shoulders of a Sierra Drop Head; over-inflation wears the centre rib and bangs every cat’s eye. Commercial and load-biased bodies like this pickup / double-cab often need a higher rear; LT or C-type sizes such as LT245/75R16 are not filled like a Fiesta.

How to set the Sierra Drop Head

Measure before the school run, not after the M25.
Write LF / RF / RR / RL. Do not keep Sierra Drop Head numbers in your head.
Add air in short bursts toward 34 psi (2.31 bar) front and 34 psi rear.
If one corner is 4 psi down, hunt for a nail before you blame the weather.
Log date, ambient temperature and the four readings.

Dutton Sierra Drop Head placard versus sidewall

The tyre-information placard on a Dutton Sierra Drop Head sits on the driver’s door pillar (sometimes the fuel-filler flap). Catalogue figures here are a general band: 32-35 / 32-35 psi.

Estimated pressure by tyre size (255/65R17 and others)

Planning cold pressures for sizes often seen on a pickup / double-cab. This Sierra Drop Head sample opens with 255/65R17, then LT265/70R17 and LT245/75R16.

Tyre size	Front PSI	Rear PSI	Front bar	Rear bar	Front kPa	Rear kPa	Note
255/65R17	37	39	2.55	2.69	255	269	Highway 17-inch
LT265/70R17	42	48	2.9	3.31	290	331	LT 17-inch
LT245/75R16	42	46	2.9	3.17	290	317	LT-metric, higher load
265/70R17	37	39	2.55	2.69	255	269	Typical 17-inch load tyre
245/70R16	36	38	2.48	2.62	248	262	Common 16-inch all-terrain
235/75R15	35	37	2.41	2.55	241	255	Older compact truck
275/65R18	37	40	2.55	2.76	255	276	Plus-size 18-inch
285/70R17	38	41	2.62	2.83	262	283	Wide all-terrain

PSI, bar and kPa

PSI-led conversions for the Dutton Sierra Drop Head band (32-35 / 32-35).

PSI	Bar	kPa
30	2.07	207
32	2.21	221
33	2.28	228
33.5	2.31	231
35	2.41	241
36	2.48	248
38	2.62	262
40	2.76	276
44	3.03	303
50	3.45	345
60	4.14	414

Pressure against load

Load moves the rear of a pickup / double-cab first. If the factory placard already has a “laden” column, use that instead of these sketches.

Condition	Front (est.)	Rear (est.)
Driver only	34 psi / 2.34 bar	34 psi / 2.34 bar
Full occupancy	34 psi / 2.34 bar	35 psi / 2.41 bar
Payload / towing	35 psi / 2.41 bar	36 psi / 2.48 bar

Temperature drift

Roughly 1 psi per 5–6 °C. The table uses 34 psi as a 20 °C baseline for this Sierra Drop Head.

Ambient	Gauge (front mid)	Bar	kPa	Note
−5 °C (hard frost)	31 psi	2.14 bar	214 kPa	Gauge reads low; do not overfill once warm
0 °C	32 psi	2.21 bar	221 kPa	Gauge reads low; do not overfill once warm
8 °C (UK winter morning)	33 psi	2.28 bar	228 kPa	Gauge reads low; do not overfill once warm
20 °C (set cold here)	34 psi	2.34 bar	234 kPa	Baseline
30 °C	36 psi	2.48 bar	248 kPa	Do not bleed a hot tyre
38 °C (heatwave tarmac)	37 psi	2.55 bar	255 kPa	Do not bleed a hot tyre

Dutton notes

No special Dutton exception: the Sierra Drop Head uses the door-pillar placard. Size estimates on this page only help if you have left the original load index behind.

Spare and inflator kit

A matching full-size spare on the Dutton Sierra Drop Head usually follows the higher axle (often the rear, near 32-35 psi). A space-saver is commonly 60 psi / 4.1 bar — read that tyre’s own sidewall. An inflator kit is not a spare; check the sealant date.

Keep the Dutton Sierra Drop Head on the printed band; use 255/65R17 and LT245/75R16 only as a map for non-OEM wheels.

Other Dutton models

B Plus Sierra Series 3 Phaeton Series 3 Phaeton Series 1 Melos Rico Sierra Series 1 B Plus Series 2

Questions about this Sierra Drop Head

What PSI if I plus-size toward LT245/75R16?

Keep load index at or above OEM. Low-profile sizes usually stay at or slightly above the placard. Use 255/65R17, LT265/70R17 and LT245/75R16 as a planning band.

How often should I check a Sierra Drop Head?

Monthly, before a long trip, and after a 10 °C weather swing. Include a full-size spare.

What is that in bar and kPa for the Sierra Drop Head?

Mid-points are about 2.31 bar (231 kPa) front and 2.31 bar (231 kPa) rear.

When does TPMS warn on a Dutton Sierra Drop Head?

Direct TPMS typically flags about 25% below placard — near 25 psi on this row. Fill to the sticker, not to the lamp.

Front versus rear on the Dutton Sierra Drop Head?

This row is 32-35 F / 32-35 R. Even when they match, a laden rear can justify a higher number if the sticker prints one.

Handbook: placard · bar vs PSI · front vs rear · cold inflation