Petunia is shod with her original tyres (and she was built in 1984). Admittedly she was hardly ever ridden before I bought her, but rubber perishes over time. I noticed during a regular check of her tyres, brakes etc a couple of days ago that the tyres have developed little hairline cracks where the sidewall curves over to the running surface. Not ideal - I don't want a massive blowout as I'm careering down a hill.
I could get cheap tyres without kevlar at the local bike shop, but time and experience has taught me that it's best to replace broken bits with the best you can possibly afford, as you'll be happier in the long run. My husband has the cheap tyres on his bike (because the local shop, like so many others here, doesn't stock a kevlar or puncture-resistant tyre in 27") and he's happy enough, but I figure I'll spend the extra and go for the Schwalbe. I've read reviews on them, I like the tread pattern, I like the look of them, and I'm happy with their performance on Penelope.
So tyres have been ordered and should arrive early next week. I know the local bike shop has 27" tubes in stock (phew) so then all I'll be waiting on for Petunia's upgrade is the Brooks saddle, also due in next week. *does a little jig with glee*