Originally Posted by dminor

OK, here's another to consider: Pyramid thorn-proof tubes. My shop gave me a pair for DH tubes this season and my gosh, I think they were heavier than my tires! Thickest-walled monsters I've ever seen; I don't think you'd need Slime or liners to augment them.

Pyramid is a kind-of generic brand that most shops can get through one of their wholesale suppliers (like J&B Importers maybe?)