Back on the topic of dealing with punctures in bicycle tyres, it was discussed in this evening's Tour de France highlights.

One option that's been around for a while is liquid latex in the tyre. If you get a puncture, the latex flows to it and seals it.

The linked article is dated 2010, and although one or two TdF teams ARE now using it, it seems most don't want to add the extra weight.

What I don't understand is why the stuff isn't more widely used by the general cycling public, for whom every tiny little last speed advantage is hardly critical, but who would be badly inconvenienced by a puncture.
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