Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Diamondback
Previous used estimate
$503 - $518
Actual value depends on condition, size, and local demand.

12-month projected trend
12%
Direction and magnitude, not judgment
vs. category average
3%
Drops faster than category avg
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
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Long a rider's favorite, the Mason Comp's history is one of innovation and forward-thinking. This continues with 27.5 Plus tires and Boost hub spacing. In short, this slack hardtail got even faster. The frame geometry has been kept quick and stable: it's still a bike you can manual through bumps and flick around—although with three-inch-wide tires at low air pressures, you may not need to—this bike sticks like glue to the trail, opening up new lines on trails you thought you had dialed. It climbs like the efficient hardtail it is, with a wide range 1×11 drivetrain putting power to the ground with incredible grip. When it’s time to descend, lower the dropper post and let out a howl as the 130mm Fox 34 Float fork works together with the ample rubber to gobble up the trail. For riders looking to push their riding and convention, the Mason Comp delivers insane traction and performance.
Inspection
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Inspection
Check chain stretch, cassette teeth, chainrings, and shifting under load before negotiating price.
Inspection
Ask for service records covering bearings, brakes, drivetrain, and any frame or fork warranty work.
Inspection
Confirm fork and rear shock service intervals and check pivot bearings for play.