Offroad Tire Pressure.
How Low, and Why.

The numbers in this article are starting points, not prescriptions. Tire type, rim width, rider weight, and luggage all shift the floor. Test on an easy section before committing to a hard one.

Lower works — up to a point

When you drop tire pressure, the contact patch grows and the tire deforms around what is under it — stones, roots, ridges — instead of bouncing off. That is it. Every benefit of lower pressure offroad comes from those two things: more rubber on the ground, and a tire that wraps around terrain instead of skipping across it. That is why the same tire at 1.25 bar (18 psi) feels like a completely different tire at 2.2 bar (32 psi).

Numbers below are given in bar with psi in brackets. Rough mental anchor: 1.0 bar ≈ 15 psi, 2.0 bar ≈ 30 psi.

The tradeoff is that as pressure drops, the tire gets easier to damage. Pinch flats. Rim strikes. The bead popping off under hard cornering. Every one of these becomes more likely as you go lower. So the real question is never "how low can I go" — it's "how low can I go on this surface, with this bike, without breaking something."

Surface first

Pressure is a compromise with the ground under you. The numbers below are starting points for an adult-weight rider on a heavy ADV bike (>200 kg). Lighter bikes can drop 0.2–0.3 bar lower on the same surface.

Hardpack, gravel, maintained dirt roads. 1.7 to 2.0 bar (25 to 29 psi). Low enough to let the tire conform to small irregularities, high enough to corner with confidence. This is probably your most common offroad pressure.

Rocks. This is where low pressure pays off most — the tire wraps around rocks instead of bouncing. 1.5 to 1.7 bar (22 to 25 psi). Also the surface most likely to pinch-flat or dent a rim, so you want low, not stupid-low. If you hear a rim strike, bump up a tenth of a bar and continue.

Sand. As low as you can get away with. 1.0 to 1.3 bar (15 to 19 psi) with rim locks, 1.5 bar (22 psi) minimum without. A bigger contact patch in sand is the difference between floating and plowing. Sand is the single surface where pressure discipline matters most.

Mud. Similar to sand — low for traction — but only if you can commit to a line. If you are going to need to paddle or correct a lot, run slightly more than pure sand to keep the bead seated.

These numbers are a baseline, not a prescription. A number written in a forum post for someone else's bike on someone else's trails is a starting point, nothing more.

Surface	Heavy ADV (>200 kg)	Lighter bikes (<200 kg)
Pavement / mixed	Manufacturer rec	Manufacturer rec
Hardpack, gravel	1.7–2.0 bar (25–29 psi)	1.5–1.8 bar (22–26 psi)
Rocks	1.5–1.7 bar (22–25 psi)	1.25–1.5 bar (18–22 psi)
Sand — no rim lock	1.5 bar (22 psi) min	1.25 bar (18 psi) min
Sand — with rim lock	1.0–1.3 bar (15–19 psi)	0.7–1.1 bar (10–16 psi)

Starting points for an adult rider, no luggage. Add 0.1–0.2 bar for heavy luggage. Adjust by feel — a rim strike means add a tenth; floaty sidewall squirm means add a tenth more.

The rim lock question

A rim lock is a rubber-coated metal clamp that grips the tire bead against the rim so the two can't rotate independently. Without it, the bead slips on the rim under hard acceleration or braking at low pressure — which pulls the valve stem sideways and eventually tears it out. With it, bead slip stops being your limit — though rim-strike risk still sets a practical floor around 1.0 bar (15 psi) on a heavy ADV.

Most ADV bikes don't come with rim locks. Dedicated enduros and dirt bikes usually do. If your bike doesn't have them, your effective offroad floor is around 1.5 bar (22 psi) on a heavy ADV, 1.25 bar (18 psi) on something lighter. Go lower and you are betting against physics. If it does, you can drop to 1.0–1.3 bar (15–19 psi) on soft surfaces when you need to.

Adding rim locks is a small job — the rim often needs a hole drilled for the stud — but they unbalance the wheel at highway speeds. For pure offroad bikes they are standard. For ADV bikes that also do tarmac miles, most people skip them and accept a higher floor.

The mixed-day problem

The real question most ADV riders face: you ride 80 km of tarmac to get to the dirt, then 150 km of dirt, then 60 km of tarmac home. What pressure do you run?

Three options, all valid. You can run offroad pressure the whole day — the tire will wear fast on tarmac, and sidewall flex at road speeds builds dangerous heat, so this only works for short transit. You can run tarmac pressure and accept worse offroad grip — safer, less fun on the dirt. Or you can drop pressure at the trailhead and pump it back up at the end. Best of both, but you need a compressor.

The compressor is the thing. A small 12V pump that runs off the bike battery changes the entire equation. Two minutes to drop from 2.5 to 1.7 bar (36 to 25 psi) at the dirt, maybe five to put it back before the tarmac home depending on the pump. A cheap pump with a built-in gauge, a valve-stem cap. That is the whole kit. Once you carry it, you stop compromising.

Hot tarmac kills tires

The mistake people make is leaving offroad pressure in the tire for a long tarmac stretch. Sidewall flex at highway speed generates heat. Heat softens rubber. Softened rubber at low pressure folds under hard cornering. The worst case is a high-speed blowout on the way home from a perfect offroad day.

The rule: if you are going to be on tarmac for more than 15–20 km at road speeds, re-inflate. If you don't have a pump, start higher and accept the slight downgrade on the dirt.

How to tell you've got it right

The manufacturer's number on the swingarm is sound for pavement. Offroad, you have to feel it.

Too high: the bike skips across small irregularities instead of tracking them. The front pushes in loose corners. You feel every root and stone through the bars.

Too low: the bike feels floaty and imprecise. The sidewalls squirm when you accelerate. Occasional thunks as the rim strikes rocks through the tire. In extreme cases, the tire rolls off the rim in a hard corner.

Just right: the bike tracks terrain without fighting it. Corners feel planted. You are not thinking about the tires — you are thinking about the trail.

Practice makes this reading automatic. Run the same tire at 1.7, 1.6, and 1.5 bar (25, 23, 22 psi) on the same trail over three rides. You will feel the difference, and you will know which number is yours on that surface.

Using the route to pick a pressure

Before a ride, open the route in the planner and look at the terrain breakdown. A route that is 70% dirt track and 30% tarmac needs a different starting pressure than one that is 95% hardpack gravel. If the terrain bar shows mostly gravel, start around 1.8 bar (26 psi). If it is rocky singletrack, drop to 1.6 bar (23 psi) at the trailhead. If the route is mostly tarmac with a dirt section in the middle, run road pressure and drop it only for the dirt.

The country pages on GoraAdv call out the typical surfaces for each region — sand-heavy, rocky, forest hardpack — so you can set a baseline before you leave and adjust on the trail.

The honest answer

There is no perfect pressure. There is a pressure that works for today's surface, today's bike weight, and today's conditions. Carry a pump with a gauge. Check before you ride, and adjust when the surface changes. Ten minutes spent on pressure is worth more than every other pre-ride adjustment combined — because the tires are the one part of the bike that actually touches the ground.