Rear hub looks like a Centaur hub with the black plastic bearing preload adjuster. Can't say I've ever heard of Chorus Titanium hubs before.Chorus Titanium hubs
The Chorus hubs used the same oversize Titanium axles as Record. They differed from the earlier Chorus 9 speed hub, which used a steel axle and non adjustable, non gear side compression dustcap. I've seen Chorus models with the black anodised preload cap before. See photos of first 9 speed steel axle Chorus type.Rear hub looks like a Centaur hub with the black plastic bearing preload adjuster. Can't say I've ever heard of Chorus Titanium hubs before.