Dutton · Sierra Drop Head · Front

Dutton Sierra Drop Head front tyres: 32-35 psi / 2.2-2.4 bar

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 front

2.31 bar · 231 kPa at the steering axle

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

A 3 psi miss on one front corner of this Sierra Drop Head shows up as a wander before the TPMS lamp bothers you. Target 34 psi (2.31 bar) cold. A 10 °C overnight drop takes roughly 1 psi (0.07 bar) off a closed Dutton tyre. Commercial and load-biased bodies like this pickup / double-cab often need a higher rear; LT or C-type sizes such as 265/70R17 are not filled like a Fiesta.

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 (245/70R16 and others)

Planning cold pressures for sizes often seen on a pickup / double-cab. This Sierra Drop Head sample opens with 245/70R16, then 235/75R15 and 265/70R17.

Tyre size	Front PSI	Rear PSI	Front bar	Rear bar	Front kPa	Rear kPa	Note
245/70R16	36	—	2.48	—	248	—	Common 16-inch all-terrain
235/75R15	35	—	2.41	—	241	—	Older compact truck
265/70R17	37	—	2.55	—	255	—	Typical 17-inch load tyre
255/65R17	37	—	2.55	—	255	—	Highway 17-inch
LT245/75R16	42	—	2.9	—	290	—	LT-metric, higher load
275/65R18	37	—	2.55	—	255	—	Plus-size 18-inch
285/70R17	38	—	2.62	—	262	—	Wide all-terrain
LT265/70R17	42	—	2.9	—	290	—	LT 17-inch

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	38 psi / 2.62 bar

Steering feel on the Sierra Drop Head lives on this axle. Do not drop front pressure to “soften” a plus-size 265/70R17; you will roll the sidewall in a roundabout.

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.

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

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.

If the Dutton sticker and this page disagree, the sticker wins.

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

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.

What PSI if I plus-size toward 265/70R17?

Keep load index at or above OEM. Low-profile sizes usually stay at or slightly above the placard. Use 245/70R16, 235/75R15 and 265/70R17 as a planning band.

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