2025 Cannondale Synapse Carbon 1

Archived: 2025 Cannondale Synapse Carbon 1 · Road · Published sizes: 48, 51, 54, 56, 58, 61

• Confirm the frame markings and seller description match this archived model. Note every component that differs from the published build.
• Record the frame serial number. It should be legible, unaltered and consistent with the seller’s ownership history.
• Find the size marking on the bicycle and confirm the fit before judging the condition or price.

Archived: Frame: Synapse Hi-MOD 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 equipped, fender mounts · Fork: Synapse Hi-MOD 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 · Carbon fiber

• Inspect the frame in bright light, especially the head tube, bottom-bracket area, chainstays and clamped surfaces. Look for cracks, ripples, crushed sections or signs of impact.
• Stand behind and in front of the bicycle to look for obvious frame, fork or wheel misalignment. Ask directly about crashes, transport damage and repairs.
• Inspect the fork crown, blades, dropouts and visible steerer area. Check that it is straight, securely installed and free of cracks or impact damage.

Archived: Shifters: Shimano Ultegra Di2 R8170, wireless, 12-speed · Front derailleur: Shimano Ultegra Di2 R8150 · Rear derailleur: Shimano Ultegra Di2 R8150 · Crankset: Shimano Ultegra R8100, 50/34, 4iiii PRECISION 3+ PRO Power Meter: 165mm (44cm), 170mm (48-51cm), 172.5 (54-56cm), 175mm (58-61) · Bottom bracket: Shimano BSA 68 · Rear cogs: Shimano Ultegra R8100, 11-34, 12-speed · Chain: Shimano Ultegra, 12-speed

• Confirm every shift battery charges and every control operates. Shift through the full cassette under light load while checking pairing, derailleur alignment and response at both ends of the range.
• Measure chain wear with a compatible gauge and inspect chainring, cassette or freewheel teeth. A new chain does not rule out wear in the remaining drivetrain.
• Turn the cranks slowly, feel for rough bearings and check for side-to-side play. Inspect crank arms, chainring bolts and pedal threads for looseness or damage.

Archived: Brakes: Brakes Shimano Ultegra R8170, 160/160mm CL800 rotors Brake Levers Shimano Ultegra Di2 R8170 hydraulic disc

• Squeeze each lever firmly. It should feel consistent and return cleanly. Check levers, hoses and calipers for fluid, inspect pad thickness and contamination, and examine rotors for wear or bending.
• Before riding, test every installed brake separately at walking speed. Each should stop firmly and release cleanly without its control reaching the end of its usable travel.

Archived: Wheel size: 700c · Rims: Reserve 42 | 49 Turbulent Aero, 24h, tubeless ready · Hubs: (F) DT Swiss 350, 12x100mm centerlock / (R) DT Swiss 350, 12x142mm centerlock · Front tire: Vittoria Corsa PRO Control, 700x32c, tubeless ready · Rear tire: Vittoria Corsa PRO Control, 700x32c, tubeless ready

• Spin both wheels and watch for side-to-side and vertical movement. Check spoke tension, rim condition and hub play.
• Inspect both tire casings for cuts, cracking, plugs, bulges or exposed threads and confirm the installed sizes are safe for the rims and available frame and fork clearance.
• Remove and reinstall or closely inspect both wheel-retention systems. Axles or quick releases should tighten correctly with undamaged threads, hardware and dropouts.
• Confirm whether the bike is actually set up tubeless, whether both tires hold pressure, and when sealant and rim tape were last serviced.

Archived: Headset: Integrated, 1-1/8" - 1-1/2" · Handlebar: Cannondale SystemBar R-One - low drag, full carbon integrated bar/stem, internal routing: 90x380mm (44m), 90x400mm (48-51cm), 100x420mm (54-56cm), 110x420mm (58-61cm) · Stem: Cannondale SystemBar R-One - low drag, full carbon integrated bar/stem, internal routing · Seatpost: Cannondale C1 Aero 27 Carbon, SmartSense compatible, 330mm length, 0mm offset (44-48cm), 15mm offset (51-61cm) · Saddle: Fizik Vento Argo R5, 140mm

• Apply the front brake and rock the bike to check for headset play or notchiness. Inspect the stem, handlebar and clamp zones, then confirm every fastener and control is secure. Look particularly closely for crushing, scoring or cracks at carbon handlebar clamp areas.
• Check that the seatpost moves for adjustment and that the saddle, post and clamp hold securely without cracks, severe corrosion or damaged hardware.

• Before riding, confirm both wheels are secure, tires are safe, both brakes function, and the headset, handlebar, stem, cranks and pedals have no looseness.
• Begin at low speed. Test steering, braking and shifting progressively, then load the drivetrain and suspension only after the basic safety checks pass.
• Listen and feel for repeated knocks, grinding, skipping, brake pulsation or movement at joints. Stop the test if the bicycle cannot be controlled safely.