2015 Trek Marlin 6

Archived: 2015 Trek Marlin 6 · Mountain Hardtail · Published sizes: 13.5, 15.5" (27.5" wheels), 17.5, 18.5, 19.5, 21.5, 23" (29" wheels)

• 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: Alpha Silver Aluminum w/semi-integrated head tube, rack & fender mounts, G2 Geometry on 29ers · Fork: SR Suntour XCT, coil spring, preload, custom G2 Geometry w/51mm offset on 29ers, 100mm travel (13.5" : 80mm travel) · Suspension

• 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 XCT, coil spring, preload, custom G2 Geometry w/51mm offset on 29ers, 100mm travel (13.5" : 80mm travel)

• 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: Group: Mountian mix · Shifters: Shimano Altus M310, 8 speed · Front derailleur: Shimano Altus · Rear derailleur: Shimano Altus M280 · Crankset: Shimano M131, 42/34/24 · Rear cogs: Shimano HG31 11-34, 8 speed · Chain: KMC Z7

• 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: Tektro M290 hydraulic disc brakes

• 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: 27.5/29 · Rims: Bontrager AT-550 36-hole · Hubs: Formula DC20 alloy, Formula DC22 alloy · Front tire: Bontrager XR1, 29x2.20" front, 29x2.00" rear (Bontrager XR2, 27.5x2.20")

• 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. This record indicates different front and rear wheel diameters, so verify each tire at its correct end.
• 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: 1-1/8" threadless, semi-integrated, semi-cartridge bearings · Handlebar: Bontrager Riser, 25.4mm, 15mm rise · Stem: Bontrager Approved, 25.4mm, 15 degree · Seatpost: Bontrager SSR, 2-bolt head, 27.2mm, 12mm offset · Saddle: Bontrager Evoke 1 · Pedals: Wellgo nylon platform

• 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.