2027 Trek Domane AL 4 Gen 4

Archived: 2027 Trek Domane AL 4 Gen 4 · Road · Published sizes: 44, 49, 52, 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: 100 Series Alpha Aluminum, tapered head tube, internal routing, fender mounts, flat mount disc, UDH, 142x12mm thru axle · Fork: Domane AL carbon, tapered carbon steerer, internal brake routing, fender mounts, flat mount disc, 12x100mm thru axle · Carbon fiber

• 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.
• 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 Tiagra R4020 · Front derailleur: Shimano Tiagra R4000, down swing · Rear derailleur: Shimano Tiagra R4000 · Crankset: 44, 49, 52, 54, 56: Shimano Tiagra R4000, 50/34, 165mm length / 58, 61: Shimano Tiagra R4000, 50/34, 170mm length · Bottom bracket: Shimano RS501 BSA · Cassette: Shimano RS400, 11-36, 11 speed · Chain: Shimano LG500, 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.

• Identify the installed brake type and actuation before choosing replacement parts or service procedures. Inspect every installed pad and braking surface, then check the complete cable, hose or linkage path for damage, corrosion, leaks or binding.
• 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: Bontrager Paradigm 23, Tubeless Ready, 24-hole, 23mm width, Presta valve · Hubs: (F) Formula RX-512 alloy, 6-bolt, 100x12mm thru axle / (R) Formula RX-142 alloy, 6-bolt, Shimano 11-speed freehub, 142x12mm thru axle · Front tire: Bontrager Kwaremont Comp, Hard-Case Lite, wire bead, 60 tpi, 700x32mm · Rear tire: Bontrager Kwaremont Comp, Hard-Case Lite, wire bead, 60 tpi, 700x32mm

• 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: Bontrager Headset Expander Plug and Top Cap · Seatpost: 44, 49: Bontrager Comp, 6061 alloy, 27.2mm, 8mm offset, 250mm length / 52, 54, 56, 58, 61: Bontrager Comp, 6061 alloy, 27.2mm, 8mm offset, 330mm length · Saddle: Verse Short Comp, steel rails, 145mm width

• 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.