2025 Synapse Carbon 4 Road Bike
Every bike is fully assembled, tuned, and test-ridden before pickup at your chosen DFW Bike Mart location.
Expected to ship within 14 days.
Professionally built and test-ridden before it ships. Arrives mostly assembled with just minimal setup needed. See Reassembly Instructions
Delivered fully assembled and tuned by Bike Mart - ready to ride right at your doorstep within 10 miles of any DFW location.
Complete your Ride
What is the Bike Mart Return policy?
What is the Bike Mart Return policy?
Bike Mart offers a 14-day return and 30-day exchange policy in effect on qualifying items. Restocking fee may apply for "At Warehouse" Items. Read More
What Financing options does Bike Mart offer?
What Financing options does Bike Mart offer?
Financing is easier than ever at Bike Mart. With Synchrony Financial, you can choose:
- 0% APR for 6 months — on orders under $999
- 0% APR for 12 months — on orders of $1,000 or more
We also support HSA/FSA Funds with TrueMed, Shop Pay Installments and PayPal Financing.
Ship
Get your bike or equipment delivered to your home directly from Bike Mart via our FedEx or USPS Carrier partners. Adult signature is required for all bike deliveries and for equipment & gear deliveries over $500.
For orders that include a bike, it will be professionally pre-built and shipped to your home with minimal assembly needed. While we try to make it as easy as possible, basic mechanical skills and proper tools are required.
If you decide to take your bike to a local bike shop for assembly, additional fees will apply.
Pickup
We’ve made it easier than ever to get the gear and bikes you love—fast. With our Buy Online, Pick Up In Store (BOPIS) option, you can shop online and pick up your items at your convenience from any of our six DFW locations.
The best part about picking up at a Bike Mart location is that you get the same high quality service with the convenience of having the exact bike or part.
Bikes / Car Racks will be assembled and installed at no extra charge and might require additional processing time for assembly.
Delivery
When you select "Home Delivery" at checkout. Your bike will be professionally assembled and the closest Bike Mart store will call you to schedule the delivery.
We offer home delivery for bike purchases only within 10 miles of a Bike Mart location. Contact us if you live beyond 10 miles and we can discuss more options. Additional fees may apply.
In stock bikes will be delivered within 7 days. Warehouse bikes will delivered within 14 days*.
2025 Synapse Carbon 4 Road Bike
Features
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Big Ride Rubber
Best-in-class clearance for tires with a maximum measured width of up to 48mm in the front and 42mm in the rear - with at least 4mm of extra clearance on each side - makes Synapse a true, ride-longer, ride-whatever kind of road bike.
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StashPort + StashBag
StashPort is our take on a downtube storage system, accessed beneath the water bottle cage. While every Synapse includes StashBag, a specially designed bag for tools and other ride essentials.
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D-Lightful
The D-shaped design of Synapse’s seatpost enhances aerodynamics and boosts vertical compliance. Reducing muscle fatigue so that you stay fresher on those longer days.
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Fly Delta
The unique-to-Cannondale v-shape Delta Steerer keeps your cockpit tidy and cables routed internally. While the reduced headtube frontal area brings aero gains to the party. As well as sleeker good looks.
Road Reimagined
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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.
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Compliant Comfort
With advancements in our carbon layup, our 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.
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Like A Glove
A great fit and feel makes for a great ride. And with our 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.
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Bring it all, bring it on
Our 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.
Overview
Overview
Road Reimagined
Go long, go short, go fast. This is WorldTour performance for real world rides.
Model Description
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.
What it's for
Comfortable high-performance road riding, long distance missions, fast group rides
Highlights
- 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
Technical Specifications
Technical Specifications
| Platform | Synapse Carbon |
| Model name | Synapse Carbon 4 |
| Model code | C12075U |
| Frame | 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 |
| 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" - 1-1/2" |
| Rear derailleur | Shimano 105 Di2 7150 |
| Front derailleur | Shimano 105 Di2 7150, braze-on |
| Shifters | Shimano 105 Di2 R7170, wireless, 12-speed |
| Chain | Shimano 105 7100, 12-speed |
| Crank | Shimano 105 7100, BSA, 50/34: 165mm (44cm), 170mm (48-51cm), 172.5 (54-56cm), 175mm (58-61) |
| Rear cogs | Shimano 105 7100, 11-34, 12-speed |
| Bottom bracket | Shimano BSA 68 |
| Brakes | Shimano 105 7170 hydraulic disc, 160/160mm RT70 rotors |
| Brake levers | Shimano 105 Di2 7170 hydraulic disc |
| Rims | DT Swiss R470 DB, 28h |
| Spokes | Stainless Steel, 14g |
| Tire size | 32 |
| Wheel size | 700c |
| Hubs | (F) Shimano RS470, 12x100mm centerlock / (R) Shimano RS470, 12x142mm centerlock |
| Tires | Vittoria Rubino Pro IV, 700x32c |
| Handlebar | Vision Trimax Aero Alloy: 400mm (44-51cm), 420mm (54-61cm) |
| Stem | Cannondale C1 Conceal, Alloy, 31.8, -6°: 80mm (44-48m), 90mm (51cm), 100mm (54-56cm), 110mm (58-61cm) |
| Grips | Cannondale Bar Tape, 3.5mm |
| Saddle | Fizik Vento Argo X5, 140mm |
| Seatpost | Cannondale C1 Aero 27 Carbon, SmartSense compatible, 330mm length, 0mm offset (44-48cm), 15mm offset (51-61cm) |
| Extra 1 | Large StashBag downtube storage bag, Conceal Stem accessory/computer mount (Garmin/Wahoo) |
| Ingestion hazard | WARNING - INGESTION HAZARD: This product contains a button cell or coin battery. DEATH or serious injury can occur if ingested. A swallowed button cell or coin battery can cause Internal Chemical Burns in as little as 2 hours. KEEP new and used batteries OUT OF REACH OF CHILDREN. Seek immediate medical attention if a battery is suspected to be swallowed or inserted inside any part of the body. |
Parts are subject to change without notice. Chat with us if you have any questions.
Geometry
Geometry
Length measurements converted to mm from Cannondale inch values. Angles in degrees.
This Geometry Chart is provided by the Manufactuer. Chat with us if you have any questions.
Sizing
Sizing
| size | inches | cm |
|---|---|---|
| 44 | 5'0" - 5'4" | 152 - 163 |
| 48 | 5'2" - 5'6" | 157 - 168 |
| 51 | 5'5" - 5'9" | 165 - 175 |
| 54 | 5'7" - 5'11" | 170 - 180 |
| 56 | 5'9" - 6'1" | 175 - 185 |
| 58 | 6'0" - 6'4" | 183 - 193 |
| 61 | 6'3" - 6'8" | 191 - 203 |
Sizing to be used as a reference only. Chat with us if you have any questions.
Why Shop at Bike Mart?
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Live Chat with Real People
Get instant advice and answers from our team of cycling experts through our online chat feature or over the phone.
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Community-Focused
We have donated over a million dollars to support our communities through charity rides, bike rallies and advocacy for more bikeable trails in Texas.
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Professional, Quality Assembly
Our bikes are expertly assembled and inspected by Bike Mart’s professionally trained staff. They ensure proper adjustments, tighten and true wheels, and get your bike ready to ride.
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Our Legacy of Excellence
With 62 years of retail experience, Bike Mart brings unparalleled expertise and dedication to serving you.
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10% off accessories with new bike purchase
Receive 10% off all accessories purchased with a new bike.
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Hassle-Free Returns
Easily initiate returns for online orders with our straightforward return policy to shop with confidence.
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Locally Owned & Operated
A family of cyclists who live and ride in your community—feel right at home.
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Free accessory installation with new bike purchase
Let our experts install your accessories at no extra cost, ensuring everything fits perfectly and is ready for your ride!
