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Tubeless Sealant Calculator — How Much Sealant?
Calculate the right amount of tubeless sealant for your tyre size and conditions.
How We Calculate This
Sealant Volume Calculation
- Size-bracket method: the recommendation is set by your tyre width, matched to the published charts from Stan's NoTubes and Bontrager TLR rather than a simple percentage of bulk air volume
- By width: 25mm road ≈ 30ml, 28-32mm ≈ 40ml, 33-45mm gravel ≈ 60ml, 46-60mm (≈1.8-2.3in MTB) ≈ 90ml, 61-75mm (≈2.4-2.8in) ≈ 120ml, 76-90mm (≈3.0in) ≈ 140ml, 91-110mm (fat 4in) ≈ 175ml, 110mm+ (fat 5in) ≈ 230ml
- Why width drives it: sealant must coat the whole inner surface of the tyre and have spare volume to plug holes — bigger tyres have far more internal surface area, so they need proportionally more
- Top-up ≈ 60% of the initial fill, replacing what dries out between checks
- Climate affects drying rate: hot, dry air dries latex sealant fastest (top up every 1-2 months) while cold, damp UK winters are kinder (4-6 months)
Frequently Asked Questions
Road (23-28mm): 30-40ml. Gravel (32-45mm): 60ml. MTB (2.0-2.3"): 90ml. Plus (2.4-2.8"): ~120ml; 3.0": ~140ml. Fat bike (4.0"): ~175ml; 5.0": ~230ml. These match the Stan's NoTubes and Bontrager TLR charts — always confirm against your sealant brand's guidelines as latex and synthetic formulas differ.
Every 2-4 months in temperate climates. Hot, dry conditions cause sealant to dry out faster (every 1-2 months). Cold climates are more forgiving (4-6 months). Check by removing the valve core and using a stick to gauge the level.
Excess sealant adds rotating weight and can cause balance issues (wobble at speed). It may also dry into a thick layer inside the tyre. Use the recommended amount.
Too little sealant may not seal punctures effectively. The sealant needs to coat the entire inner surface of the tyre and have enough volume to fill holes when they occur.
Different sealants have different properties. Latex-based (Stan NoTubes, Orange Seal) seals quickly but dries faster. Synthetic sealants last longer but may seal larger holes less effectively.
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Last updated: February 2026
All calculations are estimates. Always verify results and consult a professional bike fitter where appropriate.