Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Niner
2021 Niner MCR 9 RDO 4-Star 2x
Value Guide market data · 2021 Niner MCR 9 RDO 4-Star 2x
12-month trend
17%
Direction and magnitude, not judgment
vs. category average
— %
No category comparison available
Price over time - 2021 Niner MCR 9 RDO 4-Star 2x
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All MCR model years
2021 MCR 9 RDO 4-Star 2x lineup
Overview
About this bike
2021 Niner MCR 9 RDO 4-Star 2x value depends on condition, original build, frame material, service history, and current buyer demand.
Specifications
Drivetrain
- Groupset
- 2021 Niner MCR 9 RDO 4-Star 2x
- Shifters
- Shimano GRX 800 11sp
Brakes
- Brake Levers
- Shimano GRX 800
- Brakes
- Shimano GRX 800
Cockpit
- Tape/Grips
- Niner Bar Tape
Wheels & Tires
- Wheel Set
- Front: DT Swiss G 1800 Spline 25, Center Lock, 100x15mm<Br>Rear: DT Swiss G 1800 Spline 25, Center Lock, 142x12mm
Pedals
- Pedals
- Sold separately
Accessories
- Accessories & Extras
- Stan's NoTubes Sealant (2 x 2oz Bottles)
Frame sizing
XS4'10"-5'2"
S5'2"-5'6"
M5'6"-5'10"
L5'10"-6'2"
XL6'2"-6'6"
M highlighted as most common resale size. Sourced from catalog metadata.
Geometry
- Stack
- Varies by size
- Reach
- Varies by size
- Wheelbase
- Varies by size
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.