Tubeless Tire Pressure Calculator
Going tubeless changes your safe pressure floor more than it changes the single “optimal” number — and how much it changes depends heavily on whether your rim is hooked or hookless. This calculator shows both the tubed and tubeless result for your exact setup side by side, with the ETRTO 72.5 PSI hookless ceiling enforced automatically. Also see the tubeless MTB pressure guide.
Quick Reference — Tubed vs Tubeless PSI
165 lb rider, discipline-default bike weight, standard/reinforced casing, dry surface — use the calculator below for your exact inputs.
| Setup | Tubed (F/R) | Tubeless (F/R) | Δ PSI Lower |
|---|---|---|---|
| Gravel 40mm, hooked rim | 36 / 39 | 36 / 38 | 0 / 1 |
| Gravel 40mm, hookless rim | 36 / 39 | 33 / 35 | 3 / 4 |
| Road 28mm, hooked rim | 62 / 66 | 61 / 65 | 1 / 1 |
| Road 28mm, hookless rim | 62 / 66 | 56 / 60 | 6 / 6 |
| MTB Trail 2.4", hooked rim | 23 / 25 | 23 / 24 | 0 / 1 |
| MTB Trail 2.4", hookless rim | 23 / 25 | 21 / 23 | 2 / 2 |
Hookless rims show a much bigger tubed-vs-tubeless gap than hooked rims — the 72.5 PSI ETRTO ceiling does most of the work.
Auto-filled for Gravel — edit if you know your exact bike weight.
Tubeless rim type
Surface
How to Use This Calculator
Pick your discipline
Road, Gravel, MTB XC, MTB Trail, or MTB Enduro. Each preset auto-fills a realistic default bike weight, tire width, casing, and inner rim width for that discipline — all editable.
Enter rider and bike weight
Body weight in riding kit, plus bike + gear weight (auto-filled per discipline, adjust if you know your exact number). System weight is the single biggest driver of correct pressure.
Set tire width and casing
Width is in millimeters for road/gravel, inches for MTB. Casing affects how much structural support the tire provides on its own — thinner casings need slightly more air pressure to compensate.
Choose hooked or hookless rim
This is the input that changes the tubeless number the most. Hookless (straight-side/TSS) rims are held to a hard ETRTO ceiling of 72.5 PSI — the calculator enforces this automatically and flags it if your setup would otherwise exceed it.
Read the tubed vs tubeless comparison
The result shows both numbers side by side, plus the exact PSI delta between them for your specific setup — not a flat rule-of-thumb reduction.
Why the Tubed-vs-Tubeless Gap Isn’t Fixed
What Actually Changes When You Go Tubeless
Removing the inner tube eliminates pinch-flat risk, which is what lets riders run lower pressure with confidence — but it doesn’t automatically shift the single “optimal” pressure for a given weight and tire width by a fixed amount. This calculator’s engine treats rim/tube type as a structural input alongside casing, weight, and terrain — on a standard hooked rim, the difference between the tubed and tubeless output is often just 1–2 PSI, because the bead-retention physics barely changes. The real-world “tubeless runs 5–10 PSI lower” guidance you’ll see elsewhere is mostly describing the wider safe range tubeless unlocks — riders who used to inflate several PSI above their real target just to avoid pinch flats can now run closer to the true optimum.
Where Hookless Rims Change the Story
Hookless (straight-side / TSS) rims are a different case entirely. They carry their own lower pressure factor independent of tube setup, on top of the hard 72.5 PSI ETRTO ceiling. That combination is why the tubed-vs-tubeless gap on hookless rims in the reference table above (3–6 PSI) is meaningfully larger than the same comparison on hooked rims (0–1 PSI) — most of that gap comes from the rim design itself, not from removing the tube.
Discipline Changes the Baseline Independently
Road, gravel, and MTB each carry their own ride-style factor in the underlying formula, on top of the tube/rim comparison. Gravel and XC MTB run roughly 10% lower than an equivalent road setup at the same weight and width; Trail and Enduro MTB run about 5% higher again than XC, reflecting the extra casing support those disciplines need. Always pick the discipline that matches your actual terrain, not just your bike’s category.
The Hookless Ceiling Is Absolute
Regardless of what your calculated pressure would otherwise be, 72.5 PSI is the hard ETRTO maximum for any tire on a hookless rim bead. This calculator clamps its output there automatically on hookless selections and shows an alert when clamping occurs — never exceed this limit based on what a tire’s own sidewall claims it can hold.