Monday | 9.00am - 5.30pm |
Tuesday | 9.00am - 5.30pm |
Wednesday | 9.00am - 5.30pm |
Thursday | 9.00am - 5.30pm |
Friday | 9.00am - 5.30pm |
Saturday | 9.00am - 5.30pm |
Sunday | 10.00am - 4.00pm |
Bank Holidays | 10.00am - 5.00pm |
2025 Cannondale Synapse Carbon 4 105 Di2 Road Bike in Metallic Red

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Select Click & Collect at checkout and pick up your order at a convenient location
Monday | 9am - 5.30pm |
Tuesday | 9am - 5.30pm |
Wednesday | 9am - 5.30pm |
Thursday | 9am - 5.30pm |
Friday | 9am - 5.30pm |
Saturday | 9am - 5.30pm |
Sunday | 10am - 4.00pm |
Bank Holidays | 10am - 4.00pm |
Monday | 8am - 6.00pm |
Tuesday | 8am - 6.00pm |
Wednesday | 8am - 6.00pm |
Thursday | 8am - 6.00pm |
Friday | 8am - 6.00pm |
Saturday | 9am - 5.30pm |
Sunday | 10am - 4.00pm |
Bank Holidays | 10am - 5.00pm |
Road re-imagined
The 2025 Cannondale Synapse Carbon 4 105 Di2 Road Bike in Metallic Red is now more comfortable, aerodynamic and sleekly integrated than ever, the new Synapse is more compliant, smoother riding and better equipped to take on any epic.
Where it thrives
Dropping mates on the group ride, crushing an endurance race, exploring the globe.
What it's built for
Bringing WorldTour performance to real roads, smoothing rough surfaces, going long and hard.
- Lightweight, smoothly compliant, sleekly aero Synapse carbon frameset with StashPort downtube storage
- Shimano 105 Di2 – impressively smooth shifting from Shimano's journeyman electronic 2 x12-speed drivetrain
- DT Swiss 470 rims with Vittoria Rubino Pro IV 32c tyres – grip, durability and speed
- Cannondale C1 Aero 27 Carbon seatpost – speed meets comfort
- Fizik Vento Argo R5 saddle – ergonomic comfort with a pressure relieving cutout
All UK Mainland Bike Deliveries Over £999 - Free Bike orders are sent via TNT/FedEx with estimated delivery within 1 working day after quoted dispatch time (For Scottish Highlands, Northern Ireland, Isle of Man and the Channel Islands deliveries please allow an additional 1-4 working days).Bike orders under £999 will incur a £25 delivery fee.
Free Delivery On Orders Over £50.00 - When you spend more than £50.00 at 99 Bikes deliveries to a UK mainland address will be free (excludes bikes & large items).Certain regions and territories of the UK will incur additional charges, details of which can be found on our delivery page.
Click & Collect Orders -Please be aware Click & Collect orders may take some time to fulfil. We advise not to travel to your chosen store until you have been notified that your order is ready for collection.
At 99 Bikes our priority is to ensure that you are highly satisfied with your purchase. In the unlikely event that you aren't, we offer a 30 day online return policy* in which you can receive a full refund. Any item including bikes (with the exception of food) can be returned to us for any reason provided it is received by us in an unused and resalable condition in or with its original packaging which must be undamaged.
Find Out More About Returns >

bottom bracket
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Shimano BSA 68
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brakes
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Shimano 105 Di2 7170 hydraulic disc
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cassette
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Shimano 105 7100, 11-34, 12-speed
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chain
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Shimano 105 7100, 12-speed
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crankset
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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
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fork
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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
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frame
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Synapse Carbon, Proportional Response construction, integrated cable routing, downtube Stashport, 12x142 thru-axle, UDH, BSA 68mm threaded BB, flat mount disc, integrated seat binder, SmartSense Gen 2.0 compatible, fender mounts
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grips
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Cannondale Bar Tape, 3.5mm
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handlebars
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Vision Trimax Aero Alloy
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headset
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Integrated, 1-1/8" - 1-1/2"
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hubs
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(F) Shimano RS470, 12x100mm centerlock / (R) Shimano RS470, 12x142mm centerlock
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material
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Carbon
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rear derailleur
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Shimano 105 Di2 7150
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rims
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DT Swiss R470 db, 28h
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rotor
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Shimano 105 7170 hydraulic disc, 160/160mm RT70 rotors
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seatpost
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Cannondale C1 Aero 27 Carbon, SmartSense compatible, 330mm length, 0mm offset (44-48cm), 15mm offset (51-61cm)
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shifters
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Shimano 105 Di2 R7170, wireless, 12-speed
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tyres
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Vittoria Rubino Pro IV, 700x32c
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