How much sealant do I put in each tyre?

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.

How often do I need to top up sealant?

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.

What happens if I use too much sealant?

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.

What if I use too little sealant?

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.

Does sealant brand matter?

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.

BikeCalcs

Tubeless Sealant Calculator — How Much Sealant?

Calculate the right amount of tubeless sealant for your tyre size and conditions.

Tyre Width

Tyre width in mm, e.g. 28 road, 40 gravel, 58 for a 2.3in MTB tyre

Wheel SizeYour wheel diameter — sets the tyre circumference used to estimate internal volume

Number of Tyres

How many tyres to fill (1 wheel or 2)

ClimateTypical riding climate — hotter, drier air dries sealant faster so you top up more often

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

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Last updated: February 2026

All calculations are estimates. Always verify results and consult a professional bike fitter where appropriate.