Cervelo suggests installing an inline barrel adjuster. Between the aero bars and where the cable enters the frame on the top tube.
It does not look good. Curious if other are installing or just skipping and going through the hassle of adjusting the brakes for different rim width.
Also considering the P4 does not easily accept wider rims maybe not a big deal.
I have one, and my rear brake with zipp vuka bars is almost impossible to squeeze, its being rewired to see if that fixes it.
I have it, and am glad I do. Accessing/adjusting the rear brake is a fairly major PIA.
It’s not so much adjusting for different rim width (which I don’t have to, since I throw a disk cover on my PT wheel), but it just makes it soooo much easier to dial in proper braking, making sure nothing rubs while climbing, that sorta thing.
It’s absolutely essential. The rear brake is darned near cosmetic only. If you use training wheels that are different from your racing wheels, you’ll have differing amounts of flex and will need to alter your brake width. I found out that my disc and my P4 frame didn’t get along as I was negotiating a steep climb in a race two weekends ago. Had I not had the ability to adjust the brake while racing, my race would have been ruined. I strongly suggest you install it.