Originally Posted by
lsberrios1
I really need better measuring tools. I am sure my measurements could deviate as much as 3-5mm each way. Even with that you can tell where the main differences are. Drop and reach is significant with TT length+saddle position and head tube size with less spacing on the headset.
Also, I don't think that the saddle position on the Roubaix is optimal. It's been a while since I've ridden the roubaix on the road but I can tell you that the TCR does not give me numb junk that the roubaix does. You would think otherwise with the stretch being further out but nope. It seems like the pelvic rotation fits my sit bones better when stretched forward. On the other hand the neck gets a bit more sore on the TCR over long periods of time (5hrs +).
Plumb bob method is the standard way for measuring saddle setback, so I'd still try it. It's good that you're aware of the margin of error, but a few measurements averaged should give you some idea on where the saddle is on each of the bicycles.
Regarding neck pain, it could be that you still need to get used to the more aggressive position, if you don't often have rides that long. What can help without changing anything on the bicycle is to try to rotate your hips forward a bit more, and then focus on straightening your upper back, pushing your chest out and relaxing the elbows and shoulders in order to decrease the flexion in the neck.