Tubeless Tire Sealant Buying Guide

Tubeless sealant is sized by tire volume and climate. Road tires usually need 30-45 ml per tire, gravel tires 60-90 ml, cross-country and trail tires 90-120 ml, and fat-bike tires 150-240 ml. Add more for porous casings, hot storage, desert riding, or tires that have already sprayed sealant through several punctures. Latex sealants seal fast but dry out; fiber-loaded formulas plug larger cuts but can clog narrow valves if you pour carelessly. Check the tire every 2-4 months by shaking it or removing the valve core. If you cannot hear liquid moving, top it off before the next ride.

• Match the sealant to tire size. A 700 x 25 mm road tire and a 29 x 2.4 inch trail tire do not need the same amount.
• Check temperature range if you ride winter, desert heat, or store bikes in a garage. Some formulas thicken in cold weather or dry out quickly in heat.
• Large-puncture formulas use glitter, fibers, or platelets. They seal bigger holes but need occasional valve-core cleaning.
• Do not mix brands unless the maker says it is safe. Some latex blends clump when mixed, which leaves dried cottage-cheese chunks inside the tire.
• Refresh on a calendar, not only after flats. Most dry sealant failures happen because the tire looked fine until the first puncture had nothing wet left to plug it.