Puncture Resistant, Self-Sealing Bike Tubes

Have you ever been out mountain biking and blew a tube? It can be bad news if you are deep in the woods and you don't have a spare.
Michelin has engineered a solution for this issue. The Protek Max tubes contain a sealant that when punctured, it compresses, instead of expanding, and then self-seals. They are on sale now for around $9 in two different sizes.

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