Can you run a HED C2 90 as the rear wheel or is it to wide?
i am not sure on this one as I have not actually tried it but cervelo has not listed any incompatible wheels with the p2 as they have with the p4 and s3 (see wheel compatibility on their web site for those specific bikes) . I know people have run the sub 9 and some complain about rubbing with p2 and p3 but some are fine. i think some of it will depend on your riding style and power output. good luck!
I am looking into the same issues. There is a recent thread on the issue as well. The HED website states they now make a narrower version for the P2C and P3C.
I was just told by HED that you need 32mm of clearance for the 2008 Jet C2’s to fit.