Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Trek
2021 Trek Checkpoint ALR 4
Value Guide market data · 2021 Trek Checkpoint ALR 4
12-month trend
15%
Direction and magnitude, not judgment
vs. category average
2%
Holds value better than category avg
Price over time - 2021 Trek Checkpoint ALR 4
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All Checkpoint model years
2021 Checkpoint ALR 4 lineup
Overview
About this bike
2021 Trek Checkpoint ALR 4 value depends on condition, original build, frame material, service history, and current buyer demand.
Specifications
Frameset
- Fork
- Checkpoint carbon, tapered alloy steerer, rack mounts, fender mounts, flat mount disc
- Frame
- 300 Series Alpha Aluminum, tapered head tube, Control Freak internal routing, 3S chain keeper, rack and fender mounts, flat mount disc, Stranglehold dropouts
Drivetrain
- Groupset
- Shimano GRX
- Bottom Bracket
- Shimano RS500, 92mm, PressFit
- Cassette
- Shimano Tiagra HG500, 11-34T, 10 speed
- Chain
- KMC X10
- Chainrings
- 46/30T
- Crankset
- Shimano GRX RX600
- Front Derailleur
- Shimano GRX RX400, braze-on
- Rear Derailleur
- Shimano GRX RX400, long cage, 36T max cog
- Shifters
- Shimano GRX RX400, 10-speed
Brakes
- Brakes
- Shimano GRX hydraulic disc, flat mount, w/Shimano SM-RT70, 160mm Center Lock rotors
Cockpit
- Handlebar
- Bontrager Elite IsoZone VR-CF, alloy, 31.8mm, 93mm reach, 123mm drop
- Headset
- FSA Integrated, sealed cartridge bearing, 1-1/8'' top, 1.5'' bottom
- Saddle
- Bontrager Montrose Comp, steel rails, 138mm width
- Seatpost
- Bontrager Comp, 6061 alloy, 27.2mm, 8mm offset, 330mm length
- Stem
- Bontrager Elite, 31.8mm, Blendr compatible, 7 degree
- Grips
- Bontrager Supertack Perf tape
Wheels & Tires
- Axles
- Front: 12 x 100mm thru-axle, Rear: 12 x 142mm thru-axle
- Front Tire
- Bontrager GR1 Comp, wire bead, 60TPI, 700x40c
- Hubs
- Bontrager alloy, sealed bearing, Center Lock disc, Shimano/SRAM 11-speed freehub
- Rims
- Bontrager Tubeless Ready, 28-hole, 17mm width, Presta valve
- Spokes
- 14g stainless steel, black
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.