2025 Polygon Kalosi Altera​ High Step

Archived: 2025 Polygon Kalosi Altera​ High Step · Electric-assist · Published sizes: M, L

• 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: ALX URBAN · Fork: SR SUNTOUR MOBIE 32

• Look for dents or shape changes and inspect the edges of welds around the head tube, bottom bracket, seat cluster and suspension mounts for hairline cracks.
• 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.

Archived: Fork: SR SUNTOUR MOBIE 32

• Inspect the fork stanchions for scratches or coating wear, look for oil or dirt rings at the seals, and cycle the fork through its travel while checking for binding or bushing play.
• Ask for dated fork-service records. A clean exterior does not establish the condition of internal seals, oil or bushings.

Archived: Shifters: SHIMANO CUES SL-U4010-R 9-SPEED TRIGGER · Rear derailleur: SHIMANO CUES RD-U4000 9-SPEED · Crankset: PROWHEEL EB01-PRO44A-S3 BK 44TX170MM · Bottom bracket: BAFANG SR PA21.32.ST FOR BB SHELL 68MM (TORQUE SENSOR) · Cassette: SHIMANO CUES CS-LG300-9 9-SPEED 11-46T CASSETTE · Chain: KMC EGLIDE 9/10/11-SPEED

• 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: SHIMANO BR-MT201 HYDRAULIC DISC; Levers: SHIMANO BL-MT201; Rotors: SHIMANO SM-RT26 180MM 6B

• 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: Rims: F: ALLOY DOUBLE WALL H:19mm W: 23mm 584-23 32H FOR TYRE 584-54/71 / R: ALLOY DOUBLE WALL H:19mm W: 23mm 584-23 36H FOR TYRE 584-54/71 · Hubs: F: ALLOY 15x100mm 32H 6B / R: BAFANG DC MOTOR 48V 500W 6B · Front tire: MAXXIS METROPASS 27.5"X2.4" · Rear tire: MAXXIS METROPASS 27.5"X2.4"

• 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: TOKEN TK-1566ZM, ZS 56/28.6 | ZS 56/40 · Handlebar: HSIN LUNG MTB-AL200, W: 680mm, BB: 31.8mm, B: 6degree, R/D: 0mm · Stem: HSIN LUNG TDS-D636A, EXT: 75mm, BB: 31.8mm, R/D: ADJUSTABLE · Seatpost: HSIN LUNG SP-C261, DxL: 30.9 x 350mm · Saddle: SELLE ROYAL A059H, STEEL ø7mm · Pedals: ONE PIECE PP FLAT

• 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.

Archived: Motor: BAFANG REAR MOTOR DC MOTOR 48V 500W · Battery: GREENWAY ZZ618 48V15AH LG21700 3PIN M5.3.2

• Inspect the battery case, mount, lock and electrical contacts for cracks, impact, corrosion, swelling, overheating marks or looseness. Confirm the battery charges normally.
• Confirm the correct charger, battery keys and removable system parts are included. Check charger cables and connectors for damage or improvised repairs.
• Power the system on from cold, check the display for warnings, and test every assist mode. Assistance should engage and stop predictably without intermittent cutouts or abnormal motor noise.
• Ask for available battery-health, cycle-count, diagnostic and firmware records. Confirm that replacement batteries and system support remain available before agreeing on value.

• 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.