I've recently changed the rubber on both my bikes... Michelin krylion carbon on the commuter (from conti gp4 seasons) and conti gp4000s on the best bike (from conti ultra sport). I've never had a problem with the gp4 seasons but putting the two new sets on and even getting the ultra sport off was an absolute mission. I was utterly exhausted by the time i'd finished and it made me hope and pray that the p******* fairy isn't about for a while because doing a change at the roadside would be horrendous. So firstly, am I doing something wrong? Is it that some tyres are tight and some aren't? Does anyone have any tips for making the process a bit easier... The bit I'm really struggling on is getting the final 6 inches or so up over the rim when the tyre is already as taught as it wants to be. I'm ashamed to admit I had to use a tyre lever at one point... Surely it shouldn't be that difficult?