2021 Union
Used value range and market pricing for the 2021 Union · $3,813 - $4,428.
2021View valuesDiamondback Union
Diamondback Union Values & Pricing Guide
See year-by-year used values for the Diamondback Union. Compare model years and find out what a Diamondback Union is worth based on real marketplace sales data.
What's your bike worth?
Get an instant valuation based on real marketplace data. Free, no sign-up required.
Get Market ValueDiamondback Value Retention
Average resale value as % of original retail - Diamondback vs. category average
DiamondbackCategory avg
Diamondback value retention varies by model family, condition, and current market demand.
Diamondback Union Values by Year