2021 Jamis Explorer A1

Archived: 2021 Jamis Explorer A1 · Mountain · Published sizes: 15″, 17″, 19″, 21″, 14″ S/T, 16″ S/T, 18″ S/T

• 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: 6061 TIG-welded aluminum, all-new sport comfort design with upright ride position, replaceable derailleur hanger · Fork: SR Suntour XCE 27.5”, coil spring, external preload adjustor, 28mm stanchions, aluminum lowers, 80mm travel · Aluminum

• 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 XCE 27.5”, coil spring, external preload adjustor, 28mm stanchions, aluminum lowers, 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: Shimano TX-800 rear, Shimano TY710 31.8mm top swing/ dual pull front · Shifters: Shimano EZ-Fire Plus, ST-EF510, 24-speed · Front derailleur: Shimano TX-800 rear, Shimano TY710 31.8mm top swing/ dual pull front · Rear derailleur: Shimano TX-800 rear, Shimano TY710 31.8mm top swing/ dual pull front · Crankset: Shimano TY301, 48/38/28T, 170mm with chainguard · Bottom bracket: Sealed cartridge, 68 x 110.5mm · Cassette: Shimano HG20, 8-speed, 12-32 · 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 forged alloy direct pull brakes with Shimano levers

• 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: Wheel size: 27.5 · Wheels: Double-wall alloy rims, 32H, alloy hubs with QR, 14g stainless steel spokes · Front tire: CST – 1918, 27.5 x 2.1 · Rear tire: CST – 1918, 27.5 x 2.1

• 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: Internal cup, threaded, 1 1/8” · Handlebar: Comfort hi-rise, alloy 25.4 x 80mm rise x 15 ̊ sweep x 640mm · Stem: Jamis alloy, angle-adjustable, 90mm ext x 150mm quill (14 ̊18”) or 110mm ext x 180mm quill (19 ̊21”) · Seatpost: Suspension, alloy micro-adjust, 350mm x 27.2mm, with alloy QR clamp · Saddle: Jamis Comfort with memory foam, synthetic suede top, burnished side panels and bumper springs · Pedals: Comfort platform with TPE non-slip insert

• 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.