My bike came with Continental Ultra 2000's - I've just clocked-up 2050Kms, without a single (touching wood right now) puncture. Does anyone know how much more I can expect to get out of these tyres before I start to get punctures or before they start to become threadbare? I'm thinking of getting Michelin (Axial) Carbon's or Continental Ultra Gatorskin's; that's if I can find them when it's time... I keep my tyres hard (120PSI) all the time and I think that really helps with avoiding punctures.