(I posted this also on a
relevant reddit thread)
The new Ultimate looks very clean with the new integrated cockpit, and despite the recently increased Canyon prices, it still seems to be a hard-to-beat bargain compared to competition. After studying the cockpit design though, I had two issues:
1. OEM tool to make any adjustment on the cockpit
2. Single-bolt stem design
The first is more of a practicality concern. Besides a mini toolset, the rider will now also have to carry an OEM headset tool to make any adjustments on the fly. Why wouldn't they just use a standard Allen head screw instead of that plastic cap and the tool! It's very impractical.
The second is a security concern. A handlebar's connection to the stem is the most important security point on a fast bike. I was nervously curious about the choice of the single bolt system as opposed to the classical double bolts. Then I came across
this engineer's post, where he dissects the cockpit design on the Aeroad, which has the same system as the new Ultimate. He seems to have valid concerns on the absence of a mechanical preload to prevent loosening of this single bolt and what would happen if the bolt ever loosens ("both the headset comes loose AND the bars become loose on the steerer tube").
I really hope there is a good engineering (not just cosmetic) argument against these concerns. The fact that the new Ultimate recently, not only survived, but
smashed a GRAVEL race gives some hope that the single-bolt system can take some beating. Until I hear a good argument though, I'd keep checking the torque on that single bolt after most rides.