My rear tyre went soft when I was 3 miles from home on Thursday's ride. I tried limping back on it after pumping it up but it went down again so I stopped to top it up a second time. The tube's valve core then blew out! I don't know if that was the cause of the original problem, but I couldn't find any sharp objects in the tyre. Damn lucky that the valve didn't fail on a fast descent ...
Anyway, when I went to put a spare tube in, I noticed that the tyre had worn out. Not only was there a flat area all round the tyre, but the threads were starting to break through what was left of the rubber. It got me home, but I was not going to ride that tyre again.
I ordered some replacement Michelin Lithion 2s from Planet X on Thursday night and they arrived this morning. [I think the Lithions are a good general purpose 'training' tyre. I haven't had many punctures or cuts on mine, the rolling resistance seemed ok, I've had no problems in the wet, they were fairly comfortable, and fairly hard-wearing. Planet X are doing them at the bargain price of £11.99 at the moment so it is worth picking up a few.]
I replaced the worn out tyre today and cleaned the wheel rim and cassette while the wheel was off the bike.
I cut a 6 inch length out of the scrap tyre to carry as an emergency 'tyre boot' on rides. (A get-me-home measure in case I ever get a bad cut in a tyre.) I have cut the beading out of either side. I always have a length of gaffa tape with me, so if the worst comes to the worst, I will tape the 'boot' inside the damaged part of my tyre.
Oh, and I had been keeping an eye on my front brake blocks and decided that it was time to replace them. I might have got one or two more rides out of them but I wrecked a rim doing that once when the blocks wore out half way down a steep descent in the wet! You can't stop braking on a 25% hill with a tight bend coming up ... It is a false economy to destroy a £75 wheel for the sake of £5 worth of brake blocks!