2026 Polygon STRATTOS C8 Di2

Archived: 2026 Polygon STRATTOS C8 Di2 · Road · Published sizes: XXS, XS, S, M, L, XL, XXL

• 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: ACX ALL-ROUND · Fork: ACX ALL-ROUND FULL CARBON · 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 ST-R8170, 2x12-SPEED · Rear derailleur: SHIMANO ULTEGRA Di2 RD-R8150 DIRECT ATTACH · Crankset: SHIMANO ULTEGRA FC-R8100 50/34T · Bottom bracket: TOKEN T47 68 FOR 24mm SPINDLE · Cassette: SHIMANO ULTEGRA CS-R8101-12 11-34T · Chain: KMC X12 EPT 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: SHIMANO ULTEGRA HYDRAULIC DISC; Levers: SHIMANO ULTEGRA ST-R8170; Rotors: SHIMANO ULTEGRA CL800 F:160mm / R:160mm CENTER LOCK

• 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: Wheels: POLYGON WR4 CARBON DISC · Rims: F: CACRBON 622-21 24H FOR TYRE 622-28/62 45MM DEPTH, DISC TUBELESS READY, R: CARBON 622-21 24H FOR TYRE 622-28/62 45MM DEPTH, DISC TUBELESS READY · Hubs: F: ALLOY THRU AXLE 12x100mm 24H SEALED BEARINGS CL, R: ALLOY THRU AXLE 12x142mm 24H SEALED BEARINGS CL · Front tire: SCHWALBE ONE ADDIX TLE 700x28C · Rear tire: SCHWALBE ONE ADDIX TLE 700x28C

• Spin both wheels and watch for side-to-side and vertical movement. Check spoke tension, rim condition and hub play. Inspect the carbon rims closely for impact marks, cracks, delamination or damage around spoke holes and bead hooks.
• 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 (IS) SEALED BEARING FOR OS HEAD TUBE, IS 52/28.6 | IS 52/40 · Handlebar: LINC CARBON INTEGRATED, W: 380mm (XXS, XS, S) / 400mm (M, L) / 420mm (XL, XXL), BB: INTEGRATED, R/D: 125mm, B/R: 75mm · Stem: LINC CARBON INTEGRATED, EXT: 90mm (XXS) / 100mm (XS, S) / 110mm (M, L) / 120mm (XL, XXL), BB: INTEGRATED, R/D: 10degree · Seatpost: POLYGON XPERT ALLOY, DxL: 27.2 x 350mm · Saddle: LINC GLYD, CR-MO ø 7mm

• 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.