Join Date: Jan 2009
Bikes: More than 1, but, less than S-1
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I'm not far off your size at 6'5" and until last week was also riding a 63cm Caad(4) frame. First and foremost is the width of your sit bones (ischial tuberosities). Surprisingly this is not necessarily proportional to your overall width or size. I am in all respespects a broad and heavy framed (scientifically, not just overweight) individual. Yet, the width between my sit bones is average and I find the moderate width saddles most comfortable. There are a number of different ways that LBS's have of measuring the width of these sit bones. The most common means come as part of the Specialized and Bontrager fit kits. So, look for a Specialized or Trek dealer and they should have the ability. There are other tools out there and any shop that does reasonably elite level fittings should have one.
The second factor is flexibility and your forward position on the bike. Basically, how low is your upper body and are you achieving that by rotating your pelvis forward or by bending your back. Look at the Fizik Kurve site to get an idea of how they design saddles around this general idea. It influences the "way" your sit bones utilize the saddle. And, this is by no means a hard science.
Next may be whether the saddle is more of a "V" or a "T" shape, the realative width of the nose, and whether there is any perineal relief (that channel or hole in the center or nose).
After all that, it still comes down to what works best for you and the only way to truly know that is to demo some saddles. This is an area where LBS's truly have an opportunity to add value and justify there existance. I encourage everyone to utilize the opportunity to demo numerous saddles and repay the service by purchasing locally. That is exactly the process I went through last year when I went looking for a saddle replacement for a discontinued style. I was open and honest with each of the shops, each of which had a different line available for demo. I narrowed things down quickly by either using a spare post in a stool they had or bringing my bike along and just quickly trying the various saddles in their line. I then demo'ed the potential saddles for up to a week. In a couple instances it only took one or two rides for me to determine that a particular saddle would not be the one. In a couple other instances I found saddles that were comfortable but only in one very narrow ranged position or only for a limited time less than I require. Ultimately I ended up back on the more modern version of the very saddle I had been on long ago. But, along the way I tried saddles from Selle Italia, Fizik, Specialized, and Bontrager. And purchased with realative confidence that I had chosen the best compromise for me.
Birth Certificate, Passport, Marriage License Driver's License and Residency Permit all say I'm a Fred. I guess there's no denying it.