The Synapse Carbon 4 is an endurance road bike that strikes a great balance between agility and comfort. It's light and quick enough for fast group rides, yet compliant and versatile enough for long days and rougher roads, and the Synapse was named BikeRadar Bike of the Year 2025 for its balance of comfort, handling, fit, features and value.
The carbon frame shares the geometry and construction of the higher-end Synapse models, with a Proportional Response size-specific layup so every rider gets the same blend of stiffness and compliance. Shimano 105 Di2 12-speed uses a hybrid system with wireless shifters and a wired connection to a single seat-tube battery, for reliable electronic shifting in all conditions.
DT Swiss E550 rims on Shimano hubs give a smooth, dependable ride, and practical features include mudguard mounts, a downtube StashPort and SmartSense compatibility. Pedals are not included.
Features
- Synapse carbon frame and fork with Proportional Response construction
- Shimano 105 Di2 2x12 electronic groupset, 50/34t and 11-34t
- Shimano 105 hydraulic disc brakes, 160mm rotors
- DT Swiss E550 tubeless-ready rims on Shimano RS470 hubs
- Vittoria Rubino Pro 700x32c tyres
- Downtube StashPort, mudguard mounts, SmartSense compatible
Specifications
DisciplineEndurance Road
MaterialCarbon
Front TravelRigid
Wheel Size700c
Frame - Synapse Carbon, Proportional Response construction, integrated cable routing, downtube StashPort, 12x142mm thru-axle, UDH, BSA 68mm threaded BB, flat mount disc, integrated seat binder, SmartSense Gen 2.0 compatible, mudguard mounts
Fork - Synapse Carbon, integrated crown race, 12x100mm thru-axle, flat mount disc, internal routing, 1 1/8" to 1 1/2" Delta steerer, 55mm offset, mudguard mounts
Rims - DT Swiss E550, 28h, tubeless ready
Front Hub - Shimano RS470, 12x100mm Centerlock
Rear Hub - Shimano RS470, 12x142mm Centerlock
Spokes - Stainless steel, 14g
Tyres - Vittoria Rubino Pro IV 700x32c
Pedals - Not included
Crankset - Shimano 105 R7100, BSA, 50/34t
Bottom Bracket - Shimano BSA 68
Chain - Shimano 105 12-speed
Cassette - Shimano 105 R7100 11-34t 12-speed
Front Derailleur - Shimano 105 Di2 R7150, braze-on
Rear Derailleur - Shimano 105 Di2 R7150
Shifters - Shimano 105 Di2 R7170, wireless, 12-speed
Handlebar - Vision Trimax Aero Alloy
Bar Tape - Cannondale 3.5mm
Stem - Cannondale C1 Conceal alloy, 31.8mm, -6°
Headset - Integrated, 1 1/8" - 1 1/2"
Brakes - Shimano 105 R7170 hydraulic disc, RT70 rotors 160mm front / 160mm rear
Brake Levers - Shimano 105 Di2 R7170 hydraulic
Saddle - Fizik Vento Argo X5, 140mm
Seatpost - Cannondale C1 Aero 27 Carbon, SmartSense compatible, 0mm offset (44-48cm) / 20mm offset (51-61cm)
Sizes - 44, 48, 51, 54, 56, 58, 61cm
Synapse Carbon 4 2026
- Road
- Carbon frame
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The Synapse Carbon 4 is an endurance road bike that strikes a great balance between agility and comfort. It's light and quick enough for fast group rides, yet compliant and versatile enough for long days and rougher roads, and the Synapse was named BikeRadar Bike of the Year 2025 for its balance of comfort, handling, fit, features and value.
The carbon frame shares the geometry and construction of the higher-end Synapse models, with a Proportional Response size-specific layup so every rider gets the same blend of stiffness and compliance. Shimano 105 Di2 12-speed uses a hybrid system with wireless shifters and a wired connection to a single seat-tube battery, for reliable electronic shifting in all conditions.
DT Swiss E550 rims on Shimano hubs give a smooth, dependable ride, and practical features include mudguard mounts, a downtube StashPort and SmartSense compatibility. Pedals are not included.
Features
- Synapse carbon frame and fork with Proportional Response construction
- Shimano 105 Di2 2x12 electronic groupset, 50/34t and 11-34t
- Shimano 105 hydraulic disc brakes, 160mm rotors
- DT Swiss E550 tubeless-ready rims on Shimano RS470 hubs
- Vittoria Rubino Pro 700x32c tyres
- Downtube StashPort, mudguard mounts, SmartSense compatible
Specifications
DisciplineEndurance Road
MaterialCarbon
Front TravelRigid
Wheel Size700c
Frame - Synapse Carbon, Proportional Response construction, integrated cable routing, downtube StashPort, 12x142mm thru-axle, UDH, BSA 68mm threaded BB, flat mount disc, integrated seat binder, SmartSense Gen 2.0 compatible, mudguard mounts
Fork - Synapse Carbon, integrated crown race, 12x100mm thru-axle, flat mount disc, internal routing, 1 1/8" to 1 1/2" Delta steerer, 55mm offset, mudguard mounts
Rims - DT Swiss E550, 28h, tubeless ready
Front Hub - Shimano RS470, 12x100mm Centerlock
Rear Hub - Shimano RS470, 12x142mm Centerlock
Spokes - Stainless steel, 14g
Tyres - Vittoria Rubino Pro IV 700x32c
Pedals - Not included
Crankset - Shimano 105 R7100, BSA, 50/34t
Bottom Bracket - Shimano BSA 68
Chain - Shimano 105 12-speed
Cassette - Shimano 105 R7100 11-34t 12-speed
Front Derailleur - Shimano 105 Di2 R7150, braze-on
Rear Derailleur - Shimano 105 Di2 R7150
Shifters - Shimano 105 Di2 R7170, wireless, 12-speed
Handlebar - Vision Trimax Aero Alloy
Bar Tape - Cannondale 3.5mm
Stem - Cannondale C1 Conceal alloy, 31.8mm, -6°
Headset - Integrated, 1 1/8" - 1 1/2"
Brakes - Shimano 105 R7170 hydraulic disc, RT70 rotors 160mm front / 160mm rear
Brake Levers - Shimano 105 Di2 R7170 hydraulic
Saddle - Fizik Vento Argo X5, 140mm
Seatpost - Cannondale C1 Aero 27 Carbon, SmartSense compatible, 0mm offset (44-48cm) / 20mm offset (51-61cm)
Sizes - 44, 48, 51, 54, 56, 58, 61cm
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