Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Diamondback
Previous used estimate
$216 - $222
Actual value depends on condition, size, and local demand.

12-month projected trend
4%
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.
Choose a different build or frame style to see its value.
Is it possible to call a fat bike sleek? Diamondback's El Oso de Acero’s classic steel lines look almost elegant when compared to other fat bikes. Steel has long been the favorite of bicycle frame makers due to its strength, ride quality, and aesthetic. These tubes are butted and heat-treated, giving the bike a level of compliance on top of what the roomy tires provide. Designed to get you and your gear out in the backwoods as easily as possible, El Oso de Acero is equipped with a crisp-shifting and reliable Shimano drivetrain. With a 27-speed drivetrain, rack mounts, and a spirit of adventure, it’s a dependable workhorse for those seeking something new out of a bike. With more traction than any bike’s allowed to have, it’s a rockcrawler, a dune buggy, and a snowmobile. In white or camouflage, El Oso de Acero is ready to help you get lost!
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.