I swapped my rear wheels over last night, in preparation for the ReHaB Welsh Blat, for a set with newer tyres on (pre-owned 14 inch A048 185/60) purchased from a fellow BlatChatter who didn't like them.) I had them fitted to my spare Minator wheels a few months ago (by a tyre fitting place used by myself and several BlatChatters for years), and they've been sitting in the garage, inflated to about 28psi since then.
Once on the car, I dropped the pressure to about 16psi and set off for the ReHaB meeting. I travelled about 5 miles, warming everything up, at up to 55mph before I started to notice the car didn't feel right, then I heard a slapping noise from the rear right tyre. When I could safely pull over (motorway roundabout leading onto multi lane A road is not the best place to park) the tyre was pretty flat.
I crawled 300m to a garage and used the airline to overinflate (in Caterham terms) the tyre to 26psi. It seemed ok, but when I pushed on one specific part of the sidewall close to the rim, it leaked air. I headed back home on side roads and got over half way back before the tyre deflated too much. Without earplugs, I could hear the hiss on each revolution as (apparently) that one section of the tyre was at the bottom. I then crawled the last section home at 10-15mph to change the wheel.
So, some potentially noddy questions from me as I've never had this problem before.
* Should I bin that tyre? (On the grounds that it got pretty warm and was squished for the last couple of miles.)
* What would cause the tyre to not seal at just one point of the rim? (How much is the sealing related to the gunk they use?)
* Am I likely to have damaged the wheel by driving with a flat tyre for a couple of miles?