Description
Cannondale Synapse Carbon 4 Road Bike 2025
Cannondale’s Synapse changed the road cycling landscape 20 years ago, offering a lighter, more responsive bike that didn’t sacrifice comfort. Today, the sixth-generation Synapse Carbon Road Bike continues that tradition, with a completely reimagined frame designed for long-distance riders who demand both speed and stability.
Lighter than ever, the new frame weighs under 1150 grams thanks to a high-performance carbon layup that shaves weight without compromising stiffness or durability. A 20% boost in compliance ensures a smoother ride, while the D-shaped seatpost and Delta Steerer system enhance aerodynamics and comfort.
With space for up to 48 mm tyres at the front and 42 mm at the rear, the Synapse is built to explore everything from smooth tarmac to broken backroads. Hidden mounts for a top tube bag, the integrated StashPort tool storage system, and Cannondale’s connected wheel sensor make it ideal for real-world adventures.
Technical Specification
| Frame | Synapse Carbon, Proportional Response construction, integrated cable routing, downtube Stashport, 12x142 thru-axle, UDH, BSA 68mm threaded bottom bracket, flat mount disc, integrated seat binder, SmartSense Gen 2.0 compatible, fender mounts |
| Fork | Synapse Carbon, integrated crown race, 12x100mm thru-axle, flat mount disc, internal routing, 1-1/8" to 1-1/5" Delta steerer, 55mm offset, fender mounts |
| Headset | Integrated, 1-1/8" to 1-1/2" |
| Front Derailleur | Shimano 105 Di2 7150, braze-on |
| Rear Derailleur | Shimano 105 Di2 7150 |
| Shifters | Shimano 105 Di2 R7170, wireless, 12 speed |
| Chain | Shimano 105 7100, 12 speed |
| Crankset | Shimano 105 7100, BSA, 50/34 |
| Cassette | Shimano 105 7100, 11-34, 12 speed |
| Brakes | Shimano 105 7170 hydraulic disc, 160mm RT70 rotors |
| Brake Levers | Shimano 105 Di2 7170 hydraulic disc |
| Front Hub | Shimano RS470, 12x100mm, centrelock |
| Rear Hub | Shimano RS470, 12x142mm, centrelock |
| Rims | DT Swiss R470 db, 28h |
| Spokes | Stainless Steel, 14g |
| Tyres | Vittoria Rubino Pro IV, 700x32c |
| Handlebar | Vision Trimax Aero Alloy |
| Handlebar Tape | Cannondale Bar Tape, 3.5mm |
| Stem | Cannondale C1 Conceal, Alloy, 31.8, -6° |
| Saddle | Fizik Vento Argo X5, 140mm |
| Seatpost | Cannondale C1 Aero 27 Carbon, SmartSense compatible, 0mm offset (44–48cm), 20mm offset (51–61cm) |
| Connectivity | Cannondale Wheel Sensor |
| Extras | Large StashBag downtube storage bag |
Built, Checked, Tuned and Tested
All our bikes are fully built, checked, tuned and tested by our Cytech qualified mechanics and then securely packaged, ready for delivery. All you have to do is add the pedals (if included), attach the handlebars to the stem and tighten them following the included detailed instructions or by watching our video and using the provided FREE tools. Visit our Bike Assembly page to see how you assemble your new bike once you receive it.
All bikes collected from our shop, are built, tested and ready to ride. For hassle-free home delivery and bike set-up from a qualified mechanic use our Premier Delivery Service.
Please note, occasionally, manufacturers may change the specification without notice. Bicycles do not come with pedals unless otherwise specified. Bikes ordered for delivery will not arrive with the pedals installed, please refer to the owners manual and pedal installation guides provided for guidance. We do not install accessories to bikes, including mudguards. Bikes ordered for delivery that have tubeless compatible tyres and rims will arrive with inner tubes installed or with tubeless valves installed, this will be brand dependent. Sealant is available to be purchased separately.
If you require any assistance please contact our Customer Care team.
Size Guide
Cannondale Synapse Carbon 4 Road Bike 2025 Sizing
Delivery & Returns
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Why buy your bike from Sigma Sports?
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