2025 Polygon Oosten 26

Archived: 2025 Polygon Oosten 26 · Hybrid · Published sizes: ALL SIZE

• 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: AL6 CITY FRAME · Fork: STEEL FORK · Steel

• Inspect the complete frame for cracks, dents, distortion, heavy abrasion, suspicious paint differences or evidence of a previous repair.
• 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 RV-400, 1x8 REVO TRIGGER · Rear derailleur: SHIMANO ALTUS RD-M310DL · Crankset: STEEL CRANK, 36T · Bottom bracket: CARTIDGE BEARING 68x122.5mm · Cassette: SHIMANO CS-HG200 12-32T · Chain: KMC Z-8.3

• Shift through every available gear under light load. Hesitation, skipping or inconsistent indexing can reflect wear, damage, poor adjustment or mismatched replacement parts.
• 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: ALLOY V-BRAKES; Levers: ALLOY LEVER, PLASTIC BRACKET

• Inspect pads and braking surfaces, check the complete cable or hose path, and confirm both controls feel consistent and return cleanly.
• 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: ALLOY DOUBLE WALL, 36H · Rims: 590-20 36H FOR TYRE 590 · Hubs: F: ALLOY NUTx100mm 36H V-BRAKE ONLY / R: ALLOY NUTx135mm 36H V-BRAKE for Freewheel · Front tire: DELI 26"x1-3/8" · Rear tire: DELI 26"x1-3/8"

• 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.

Archived: Headset: EXTERNAL CUP THREADED, ZS 34/28.6 | ZS 34/30 · Handlebar: ALLOY HANDLEBAR, W: 620mm, BB: 25.4mm, R/D: 112mm, B: 50degree · Stem: ALLOY QUIL STEM, EXT: 80mm, BB: 25.4mm, R/D: 30degree · Seatpost: ALLOY SEATPOST, DxL: 27.2 x 250mm · Saddle: SELLE ROYAL ONDINA, STEEL ø 7mm · Pedals: PP PEDAL W/ REFLECTOR

• 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.
• 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.