I picked up a pair of Continental Sport Contact tyres a couple of months ago when I found them for sale at £10 each. They're 42x559, which fit my two 26" wheel bikes. As they're a lot more supple than the Land Cruisers I've been MTBing on so far this year, I thought they might be a bit of fun during the summer as most of the surfaces I ride on tend to dry and harden.
I put them on my GT Avalanche yesterday, but I managed to grunge up and/or displace the disc brake pads somehow, so I got a horrible noise from the front wheel - not a great start. But today I've taken the wheel off again and cleaned things out, and it seems quiet now (and the brake still works). I'll try them on the road later.
Oh, and I gave the Avalanche a good all-over clean while I was at it, together with my Raleigh touring bike.