Mercedes-Benz · SL 73 AMG · Cold

Mercedes-Benz SL 73 AMG cold-inflation guide

Drivetrain: rear-wheel drive
Body: passenger car
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

Cold means the Mercedes-Benz SL 73 AMG has stood at least three hours, or covered less than about a mile. Heat from a dual carriageway run is not the number you set. TPMS typically warns near 25 psi (about 25% below target). That is already a soft tyre, not a fill target.

Temperature and a cold gauge

Roughly 1 psi per 5–6 °C. The table uses 34 psi as a 20 °C baseline for this SL 73 AMG.

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

How to set the SL 73 AMG

Park the Mercedes-Benz SL 73 AMG for at least three hours (cold tyres).
Use a calibrated gauge, not the only meter on a forecourt hose.
Set the placard for that axle — about 32-35 psi / 2.2-2.4 bar front and 32-35 psi / 2.2-2.4 bar rear on this catalogue row.
Recheck all four. A 2 psi miss on a rear-wheel drive SL 73 AMG is enough to feel a pull.
Refit valve caps and reset TPMS if the handbook asks for a relearn.

Mercedes-Benz SL 73 AMG placard versus sidewall

The tyre-information placard on a Mercedes-Benz SL 73 AMG 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 (245/40R18 and others)

If your Mercedes-Benz SL 73 AMG no longer wears the OEM diameter, start at the row nearest 245/40R18 or 275/35R18 and confirm with the tyre maker’s load table.

Tyre size	Front PSI	Rear PSI	Front bar	Rear bar	Front kPa	Rear kPa	Note
245/40R18	35	36	2.41	2.48	241	248	Square-ish sport
275/35R18	36	37	2.48	2.55	248	255	Wide rear
225/40R18	35	35	2.41	2.41	241	241	Front 18-inch
255/40R17	35	36	2.41	2.48	241	248	Rear stagger 17-inch
255/35R18	35	36	2.41	2.48	241	248	Rear stagger 18-inch
275/30R19	36	37	2.48	2.55	248	255	Rear 19-inch
235/35R19	36	36	2.48	2.48	248	248	Front 19-inch
225/45R17	34	35	2.34	2.41	234	241	Front sport size

PSI, bar and kPa

PSI-led conversions for the Mercedes-Benz SL 73 AMG 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

Load notes

Load moves the rear of a passenger car 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
Motorway + luggage	35 psi / 2.41 bar	37 psi / 2.55 bar

Mercedes-Benz notes

Mercedes often lists comfort versus load. Match the table to how the SL 73 AMG is actually occupied that day.

Spare and inflator kit

A matching full-size spare on the Mercedes-Benz SL 73 AMG 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 Mercedes-Benz sticker and this page disagree, the sticker wins.

Other Mercedes-Benz models

420 220 380 308 450 320 350 300

Questions about this SL 73 AMG

What tyre pressure should a Mercedes-Benz SL 73 AMG use?

Catalogue reference is 32-35 psi front and 32-35 psi rear (2.2-2.4 / 2.2-2.4 bar), cold. Confirm on the door-pillar placard.

How often should I check a SL 73 AMG?

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

What PSI if I plus-size toward 225/40R18?

Keep load index at or above OEM. Low-profile sizes usually stay at or slightly above the placard. Use 245/40R18, 275/35R18 and 225/40R18 as a planning band.

What is that in bar and kPa for the SL 73 AMG?

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

Front versus rear on the Mercedes-Benz SL 73 AMG?

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