I have a Crank bros tyre lever, (plus standard lever's) it telescopes out and clips over the skewer, depending on whether you are removing or replacing tyres depends on which end of the tool you engage onto the rim, they make getting tyres on and off my Mavic and Campag rims a complete doddle, and you only need carry the one lever, at about £5 a real bargain. You'll also ned a pump or CO2 inflator, plus a couple of spare tubes, which, as others have pointed out are 700c. I have the Kenda Kontenders with wire bead on my winter hack, and I find them OK for a budget tyre, as it's my winter bike, I'm not overly worried about weight, it helps when you come to climb aboard your 'best' bike.