Stop guessing at the pump.
Your weight, your tire, today's ground — front and rear in seconds. Then it learns how you actually like it.
Free · no account · works offline
Tap a surface. The number moves.Nobody actually knows what to run.
The number on the sidewall is a legal maximum. The rider you follow runs 15 psi harder than you. So you guess — and you find out forty minutes in, on the wrong side of a washboard descent.
Baró won't claim certainty either. It starts you somewhere honest — then moves toward you.
Start with the bike you're on.
Four bikes here, each with its own tires, its own colour and its own learned offset. Tap one and everything below — the number included — is about that bike.
Then say where you're going.
Road, all-road, gravel, trail. Refine the surface if you care to — loose and chunky, washboard, wet — and every choice shows exactly what it did: “net effect right now, −16% against a smooth-road baseline.”
Your weight, and what your pump reads.
Weight is the biggest single input to the number — Baró starts from a default and tells you on the card that it is one. Tap the ⓘ beside your pump and it shows you how to find your gauge's own error, rather than assuming you know.
Front and rear, with the reason.
A range instead of false precision, and one plain line for why it landed there. Want the whole derivation? It's one tap, in words, including the part where Baró is inferring rather than measuring.
Say how that felt. It listens.
Harsh, just right, squirmy — three taps. Eleven rides in, this bike sits 1 psi softer than the engineering baseline, which is exactly where its rider wants it. The math got you close; your hands finished it.
202 lb all in, 40 mm on a 25 mm rim, tubeless — gravel, loose & chunky · rolling · dry. A starting point, not a spec. Baró says so on the card.
Every bike you own
Road, gravel, trail, winter beater — each with its own tires, colour and learned offset.Your pump is wrong. Say by how much.
A floor-pump gauge that reads even a few psi off moves your real pressure further than every refinement in this app put together. Tell Baró the offset and the true target keeps the headline, with the number to pump to beside it.
Readable at dawn
The headlight goes dark on its own overnight, so a 5 a.m. start doesn't blind you.
Works with no signal
Installed once, it opens at the trailhead. Backups are a plain file you keep — restoring only ever adds rides.
No account, no tracking
Free, no ads, nothing leaves the phone.
Fair questions
Is it accurate?
Baró is fitted to published pressure data and checked against every reference setup in it — all of them, not a flattering subset. It starts from a number you can check rather than one opinion, then moves toward the way you actually like it. See how the number is calculated.
Do I need an account?
No. No sign-up, no email, no analytics. Every bike and every rating stays on your phone, and you can export a copy whenever you like.
Road bike or mountain bike?
Both, modelled separately. Road and gravel chase the speed breakpoint; MTB chases grip, with its own allowance for what you land on.
How many rides before it learns?
Three rated rides on one kind of ground start to move the number; six and it's dialled in. Each surface learns on its own.
psi or bar? lb or kg?
One tap, top right, and every pressure and weight in the app follows it.
What does it cost?
Nothing, and no ads pay for it either. Baró stays free — buy me a coffee if you want to.
Put it on your home screen.
Installed, Baró opens with no browser chrome, no loading and no signal required — with every bike exactly where you left it.
iPhone: open it in Safari, tap Share, then Add to Home Screen. Open Baró PSI to install
Ride the right number tomorrow morning.
Free at baropsi.com/app. Add it to your home screen and it works offline, fonts and all.