No Tubes Stans tyre sealant is a miraculous cycling product. It allows you to instantly repair a hole up to 1/4 inches on either a converted standard or tubeless tyre with just two ounces. That makes it an economical and inexpensive fixing device to have around.The sealant stays liquid in a thin casing mountain bike tyre for between two to seven months. You can even use the sealant when the weather drops as cold as 30°f due to the anti-freeze agents.Riding in arid climates or storing the bike in a hot area will require more frequent monitoring of sealant levels.