I got a 2017 Canyon Ultimate CF SLX for about half year now and had put appx 1200 miles on it. For the past couple months the bike developed a light ticking sound and I believe it's coming from the bb area so I thought it's time to service / change out the bottom bracket bearings (PF86).
So I used the proper tool (Enduro BRT-003) to remove the original bottom bracket cups that came with the bike (SRAM plastic ones), which went smoothly. However, the problem occurred when I installing a new set of bottom bracket bearing cups (Kogel PF86 ceramic, aluminum cups). With the bearing cups being squeezed into the frame (stress into the frame from both sides, which makes the frame slightly bends), I saw this hairline crack budged up (see pic) and making a very loud popping sound on every 1/4 turn of the press tool (see the video @ 42 seconds mark). https://youtu.be/2BfNSOYwo-k
It seems like the cups are very tight for the frame. I stopped the installation immediately and discovered that the bottom bracket housing on the frame is not perfectly rounded. The outer edge of the cups would not sit flush with the frame therefore they are being force INTO the frame and created that hairline crack. Now I'm not exactly sure if it's just a paint crack or it's the actual carbon layer but I can see the crack line continued inside into the frame (see the pic I circled). I did the coin tapping method on the crack and it sounds pretty much the same, maybe just a slight difference then the area next to it.
On a side note, my friend also bought an Ultimate EVO frameset and he's using the same Kogel PF86 bb cups and they went in smoothly. But now he's complaining the the bottom bracket has some plays too.
Also there's a crack on the paint on the non driveside of the bb area, I noticed it when I received the bike new but I thought it's a paint crack so I didn't pay too much attention to it. Not sure if it has anything to do with the hairline crack on the bottom of the down tube.
I've emailed both Canyon USA and Canyon German couple days ago but haven't heard back from them. The bike was purchased thru the German site and had it shipped to my Hong Kong address where I brought it back to the U.S. I understand Canyon USA would only deal with warranty works with bikes being purchased in the U.S. but I figured just give it a shot since their office is only 50 miles away from where I live.
What do you guys think?