No interference at all. Fit is as if they were designed as a system.
Planning on BTA and behind the saddle for hydration. May have bosses added to top tube for nutrition, but haven't decided.
Bike is amazing to ride. Couldn't be more impressed with the product or the company. Guys at Dimond had terrific communication and advice throughout the process. Doesn't hurt that I too live in Des Moines and was allowed to check-in at the shop :)
I can't see closely enough but look at Lizard Skinz red tape. Thats what I used on my Felts and I think they keep the same "red" color throughout the product line. Worth a try at least! ------ "Train so you have no regrets @ the finish line"