Cannondale SYNAPSE CARBON 4 - Roadbike - 2025 - chalk

Road reimagined.

Wireless brains meet all-road brawn. Cannondale 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.

Real world performance. Designed to go fast, built to go long, and made to keep you comfortable, the Synapse redefines road performance. With a lightweight frame featuring wind-tunnel-sculpted tubing and PB-blasting stiffness-to-weight, it’s a bike that’s ready for anything you demand of it. Just ask Lachlan Morton why he trusted it for his record-smashing lap of Australia. Unreal speed, engineered for real-world roads.​ 

Compliant comfort. With advancements in the carbon layup, the Cannondale engineers have made the new Synapse 20% more compliant than its already butter-smooth predecessor, ensuring you feel 100% more comfortable even on the roughest roads. 

Fits like a glove. A great fit and feel makes for a great ride. And with Proportional Response Construction, every rider gets that as standard. From the carbon layup through to the geometry, everything on Synapse has been tuned and tested by frame size. So that your bike works in harmony with you to give the best possible ride for you and your height.

Bring it all, bring it on. The all-new StashPort storage system in the downtube is there when you need it and hidden when you don’t. Paired with its StashBag buddy, you can bring along your ride essentials and know that they’ll be secure, whatever you get up to out there. Meanwhile, best-in-class tire clearance lets you take the idea of riding for longer to a whole new level. 

Features of Cannondale SYNAPSE CARBON 4:

• Synapse carbon frame
• Proportional Response Design
• Versatile mounting points and eyelets
• SmartSense Gen. 2 compatible
• Tire clearance: 48 mm front / 42 mm rear
• StashPort + StashBag
• D-shaped seatpost
• V-shaped Delta steerer tube