Bicycle Hookless Compatibility Checker
Check that a tire is safe on a hookless rim. Use the calculator below. Results update as you type.
How the Bicycle Hookless Compatibility Checker Works
This checker works by testing a tire and rim pairing against 3 hookless rules: tubeless-ready tire, minimum tire width for the rim and the 5 bar (72.5 psi) maximum pressure.
- Enter the rim's internal width and type, for example 25 mm TSS.
- Enter the tire width and type, for example 28 mm tubeless-ready.
- Enter your planned pressure, for example 60 psi (4.1 bar).
- Read the result: Fails the width rule; a 29 mm or wider tire is needed.
The Formula
The formula is Pass = Tubeless Tire AND Width ≥ Minimum AND Pressure ≤ Lowest Limit.
Pass = TLR AND W_tire ≥ W_min(rim) AND P ≤ min(P_tire, P_rim, 5 bar) 5 bar = 500 kPa = 72.5 psiWorked example: a 30 mm tubeless tire on a 25 mm TSS rim at 55 psi (3.8 bar) passes all 3 rules.
Conversion Table
The conversion table lists 6 hookless rules and limits in metric and imperial units. The 5 bar maximum and the 29 mm minimum on a 25 mm rim are the 2 numeric limits.
The pressure rule names 3 limits: tire, rim and ETRTO. Use the lowest.
| Rule | Value | Metric | Imperial |
|---|---|---|---|
| Maximum pressure (ETRTO) | 5 bar | 500 kPa | 72.5 psi |
| Minimum tire on 25 mm internal rim (2023 ETRTO) | 29 mm | 29 mm | 1.14 in |
| Tire type | Tubeless or tubeless-ready | — | — |
| Rim type marking | TSS | Tubeless Straight Side | — |
| Pressure rule with 3 limits | Use the lowest | Tire, rim, ETRTO | — |
| Approved tire list | Rim maker's chart | — | — |
What Is the Bicycle Hookless Compatibility Checker?
The Bicycle Hookless Compatibility Checker is a tool that checks tire and rim requirements for hookless (Tubeless Straight Side, TSS) rims. Hookless rims have straight inner walls with no hook to grip the tire bead.
Hookless rims rely on bead fit and lower pressure to hold the tire. ETRTO caps hookless road pressure at 5 bar and sets minimum tire widths per rim width. Some rim makers add their own approved-tire lists.
Common Uses
This checker has 4 uses: tire purchases, pressure planning, wheel upgrades and safety checks.
- Buy tires: Confirm the tire is approved for hookless.
- Plan pressure: Stay under 5 bar.
- Upgrade wheels: Check current tires against new hookless rims.
- Check safety: Catch narrow-tire pairings.