Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Opus
2021 Opus Horizon AL 105-GRX
Value Guide market data · 2021 Opus Horizon AL 105-GRX
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All Horizon model years
2021 Horizon AL 105-GRX lineup
Overview
About this bike
2021 Opus Horizon AL 105-GRX value depends on condition, original build, frame material, service history, and current buyer demand.
Specifications
Frameset
- Frame
- Aluminum / Meta 30 aluminumBB Standard:BSA, 68mm, ThreadedTire Clearance:50c
- Suspension
- Rigid
- Fork
- Carbon / Full carbon tapered 1-1/2 to 1-1/8 in
- Headset
- FSA Orbit integrated sealed
Drivetrain
- Drivetrain
- 1 × 11
- Groupset
- Apex
- Bottom Bracket
- SRAM GXP sealed BSC threaded
- Rear Derailleur
- SRAM APEX 1 long cage
- Crank
- SRAM Apex 1
- Shifters
- SRAM APEX 1x11
- Cassette
- SRAM PG1130 11-42
- Chain
- SRAM PC1110
Brakes
- Brakes
- Promax Hydraulic Disc / Promax Decode R Flat Mount twin piston discType:Promax Hydraulic Disc
- Brake Levers
- SRAM
Cockpit
- Stem
- Promax
- Handlebar
- X-Race Aero 16° flare
- Saddle
- Opus Endurance
- Seatpost
- Promax alloy 27.2 x 300Type:Rigid
Wheels & Tires
- Wheels
- 650b Aluminum
- Rims
- Weinmann U28TL 650
- Front Hub
- Alex Bear Pawls through axle 12 mm fr/rr
- Rear Hub
- Alex Bear Pawls through axle 12 mm fr/rr
- Tires
- Kenda Flintridge Sport 650 x 45 CSK
Weight & Sizing
- Weight
- 22.4 lbs
Frame sizing
XXSManufacturer sizing
XSManufacturer sizing
SMManufacturer sizing
MDManufacturer sizing
LGManufacturer sizing
XLManufacturer sizing
MD highlighted as most common resale size. Sourced from catalog metadata.
Geometry
- Stack
- 590
- Reach
- 384
- Top Tube Length
- 559
- Seat Tube Length
- 510
- Chainstay Length
- 427
- Wheelbase
- —
Industry standard. Sourced from catalog metadata.
What to check when buying used
Inspection
Drivetrain wear
Check chain stretch, cassette teeth, chainrings, and shifting under load before negotiating price.
Inspection
Wheel condition
Inspect rims, hubs, spokes, and bearing play; ask about the tire age and any prior wheel rebuilds.
Inspection
Service history
Ask for service records covering bearings, brakes, drivetrain, and any frame or fork warranty work.
Inspection
Carbon inspection
Tap test the frame, fork, seatpost, and bars for cracks; verify no impact damage near dropouts.
Inspection
Brake hoses & cables
Check hydraulic line bleed, cable housing wear, and confirm rotors are within spec.