What an inclinometer tells you
An inclinometer shows your vehicle’s live angle in degrees. Pitch is nose up or down, as on a climb or descent. Roll is side to side, as on a side slope. Roll is the one that matters most: a vehicle tips over sideways much more easily than forward or backward.
Live pitch and roll aren’t the same as the approach, breakover and departure angles on a spec sheet. Those are fixed numbers for your vehicle’s shape; an inclinometer tells you where you are right now.
Crossing side slopes
Avoid driving across a slope whenever you can. Crossing puts more weight on the downhill tires, which raises the chance of a slide or rollover. Go straight up or straight down instead. From maker specs
If an obstacle forces you across, pick firm ground and keep the angle as shallow as you can. Never climb a hill at an angle, and never turn around on a steep grade. Jeep, Toyota and Ram give the same advice in their owner’s manuals.
Is there a safe roll angle?
Not one you can look up. None of the vehicle makers or agencies we checked publishes a safe side-tilt angle, or says what angle its dash display warns at. How far a vehicle can lean depends on its load, tires, terrain and speed.
Government rollover ratings use a different measure, the static stability factor: track width divided by twice the height of the center of gravity. It predicts on-road rollover crashes, and no source we found converts it into a trail angle. Load matters too: cargo on the roof raises the center of gravity.
What owners report reaching From 4 owner reports
Four Tacoma owners describe factory displays reading 25–30° on real trails, and two say their 2024+ gauge flashes orange before 30°. These are what owners say they saw, not limits, and they depend on load, terrain and the vehicle.
Your truck may already have one
- Jeep Wrangler: a Pitch and Roll screen in the instrument cluster, and a Pitch & Roll page in Off-Road Pages where equipped. It shows “- -” when the vehicle is moving too fast.
- Jeep Gladiator: a Pitch and Roll screen in the instrument cluster.
- Ram 2500/3500: a Pitch & Roll display in Off-Road Pages, where equipped.
- Toyota Tacoma: owners describe a pitch and roll gauge on TRD Off-Road and later trims. We couldn’t confirm it in Toyota’s own documents.
Phone apps vs dash gauges
| Phone app | Dash gauge | |
|---|---|---|
| Examples | Tiltometer, Off-Road Inclinometer, Lean, Vehicle Clinometer (iOS) | Sun Lev-o-gage (one axis, −45° to 45°), Sun AltiTilt (adds an altimeter), Smittybilt Clinometer II (pitch, roll and compass) |
| How it works | The phone’s motion sensors | Mechanical dials; the Sun units use a ball in damping fluid, and the Lev-o-gage needs no power |
| Extras | Some log your trail, track the maximum angle, or sound an alarm at angles you set | Always on the dash; nothing to launch or charge |
| Watch for | Must be zeroed in its mount; one owner found readings changed every time he re-mounted the phone | Takes dash space; one owner wishes they sat lower |
| Stated accuracy | None published; Lean’s developer calls its app “an aid, not a guarantee” | None published by Sun or Smittybilt |
Mounting and zeroing
- Zero it on level ground with the vehicle parked, in the position it will ride in. Several apps have a zero button for this.
- Keep a phone in the same fixed mount. Moving it means zeroing again.
- The Sun AltiTilt reads tilt accurately only when its housing sits vertically.
Do owners find them useful?
What owners report From 45 owner reports
- 8 of 45 say they use theirs on the trail, for example to judge roll on sketchy trails.
- 9 of 45 doubt it as a warning or call it a gimmick. Three make the same point: by the time it matters, you’re watching the trail, not the gauge.
- 5 of 45 mainly use it to level the vehicle at camp, for sleeping or a roof-top tent.
Taken together: an inclinometer is a reference, not a safety system. It can help you notice a slope getting steeper, and it’s handy for leveling at camp, but none of the sources here offers a number it can safely warn you at.
FAQ
What angle should I stop at?
No vehicle maker or agency we found publishes one. Jeep, Toyota and Ram all advise avoiding side slopes and driving straight up or down. Load, tires, terrain and speed all change the picture.
Is a phone app accurate enough?
No app we found states an accuracy figure, and no source compares apps with dedicated gauges. Owners report that phone readings can drift and change when the phone is re-mounted, so zero it in its mount each time.
Do I need one if my Jeep has Off-Road Pages?
Not for the reading itself: Wrangler Off-Road Pages already show pitch and roll in degrees, where equipped.
Sources
Show all 21 sources
Manufacturer data (10)
- Jeep, 2026 Wrangler Owner's Manual
- Jeep, 2026 Gladiator Owner's Manual
- Toyota, 2026 4Runner Consumer Information
- Ram, 2022 2500/3500 Owner's Manual, Off-Road Driving Tips
- Ram, 2022 2500/3500 Owner's Manual, Off-Road Pages
- Sun Company, Lev-o-gage 201-F
- Sun Company, AltiTilt
- Smittybilt, Clinometer II 791006
- App Store, Lean: Inclinometer
- App Store, Tiltometer
Owner reports (8)
- Tacoma4G, Max pitch and roll angle? (2025)
- Expedition Portal, Any decent inclinometers? (2012-2013)
- IH8MUD, FZJ80 Inclinometer (2012)
- IH8MUD, digital inclinometer (2006)
- IH8MUD, inclinometer app (2011)
- Tacoma World, Pitch & Roll (2019)
- Tacoma World, Pitch/Roll display (2017-2018)
- Tacoma World, Inclinometer (2017)