Bought a set of 28c Continental Grand Prix 4000S II tyres exactly 1 year ago from Wiggle, they're already cracking. Is this normal, and how do I avoid this in the future? :
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![Continental Grand Prix 4000 S II 650c Road Tire [C1022223] at BikeTiresDirect](https://static.biketiresdirect.com/productimages/images650/co2s62-1.jpg "Continental Grand Prix 4000 S II 650c Road Tire [C1022223] at BikeTiresDirect")