Wireless brains meet all-road brawn. Synapse Carbon 4 runs Shimano 105 Di2 for a shifting experience that feels straight off the pro tour, minus the bank loan. The frame delivers that signature Synapse ride—quietly fast, endlessly composed—and plays nice with wide tires, fenders, and long days. Call it the sweet spot between Sunday speed and weekday practicality.

Features: 

• Lightweight, smoothly compliant, sleekly aero Synapse carbon frameset with StashPort downtube storage 
  
• Shimano 105 Di2 – Impressively smooth shifting from Shimano's journeyman electronic 2x12-speed drivetrain 
  
• DT Swiss 470 rims with Vittoria Rubino Pro IV 32c tires - grip, durability, and speed 
  
• Cannondale C1 Aero 27 Carbon seatpost - speed meets comfort 
  
• Fizik Vento Argo R5 saddle - ergonomic comfort with pressure relieving cutout