On Sun, 17 May 2009 09:51:43 +0100, Alan wrote:
Surprisingly, I have no inner tubes

When did car tyres last have inner tubes?

I had two fitted* to a car about ten years ago which had 1970's alloys on
it - internal corrosion / pitting meant that a tyre just wouldn't seal
properly any more. I probably did about 40k of fast-road driving on
them after and never had any problems.

* I really don't recall who now, but it was one of the national UK chains
rather than some backwater garage.

cheers

Jules