If you're obsessed with marginal gains and have the wallet to back it up, Specialized made S-Works for you. If you're obsessed with phenomenal performance and still having money left over for a cappuccino at the end of a hard training ride, look no further than the 2017 Specialized Tarmac Pro Ultegra Di2. Like the S-Works iterations, it features a Rider-First Engineered™ design that that applies specificity to every tube size and carbon layup for every frame size. This creates the optimal balance of rigidity, weight, and responsiveness, so every frame, regardless of size, performs just as Specialized intended. You'll also find an identical, Grand-Tour-winning geometry, plus a FACT 10r carbon fiber construction that's mere steps away from what you'll find under the likes of Peter Sagan and Alberto Contador