Bikes, hills & centuries...question

[OakLeaf]

On my 11-year run of consecutive TOSRVs, I rode the last two on my race bike. Steel frame, but moderately aggressive geometry. I was a little apprehensive the first time, but more than gratified - enough to do it again the next year. If the bike fits well, IMO it should be comfortable for all day, and you can use a bento box or a fanny pack for a couple of little extra things on a supported century.

IMO, more laid back touring rigs are best for unsupported overnight rides, commuting, etc., when you want to be able to hang racks and maybe fenders on it. You don't need all that on a supported ride, or on a day ride of any length unless you ride in changing weather conditions and need to carry a lot of bulky clothing options.



ETA: looking up the gearing, it looks like the Tarmac comes with a standard double (53/39) and the Roubaix has a compact (50/34). They both come with wide-range 11-28 cassettes, which is the limit for the Ultegra derailleur, meaning you can't get shorter gearing without replacing the rear derailleur too (or making a change up front, which is a bigger and much more expensive deal). So it depends on your legs whether the Tarmac is geared short enough. Can you test ride them up one of your longer, steeper hills for comparison?