"Discover the ultimate ride for your next endurance adventure with the Specialized Roubaix SL4 Expert. Designed to conquer long miles with ease, this acclaimed model delivers an exceptional blend of efficiency and sublime ride quality" which I can vouch for. Really lightweight and responsive. According to Strava it's got about 3200 miles on it, at least half of which have been indoors on a smart trainer so road wear is pretty minimal for a 10 year old bike. At the time I splurged for a nice bike because I intended to switch from running to cycling but the switch only lasted a season. Pretty much all original equipment other than the saddle.