I finally got my wife the bike she always wanted. But, they hate each other right now. Like really. And I feel *** about it. A few weeks after we got the the brand new bike, the headset started creaking. I opened it up and was surprised to see that there were no aluminum headset cups. The bearing fits straight onto the carbon fibre. The bike was due for its first service in a few days, so I decided to put a light coat of grease between the bearing and the carbon fiber. Just enough to shut it up. A few days later, I took it to the bikeshop and told them what happened and what I did to make the creaking headset go away. When I went to go fetch the bike, they told me to use carbon paste between the headset and the bearing. Ok, if you say so. They even gave me some. So, three weeks on and the creak is back with a vengeance. And my wife is in tears. I was surprised to find that the bikeshop didn't remove the small coating of grease in the headset. That was still there. I was expecting carbon paste... Anyway, wiped it all clean and used the carbon paste as they suggested. The headset is once again quiet but for how long, I don't know. My question is: this is not supposed to happen on a brand new bike and yes, I should make a moer of a fuss about it BUT, I want to know: what is supposed to come between the bearing and the headset, keeping on mind the bearing goes straight onto the carbon?