Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Diamondback
2021 Diamondback Union 2
Previous used estimate
$1,306 - $1,344
Actual value depends on condition, size, and local demand.
Value Guide market data · 2021 Diamondback Union 2
12-month projected trend
13%
Direction and magnitude, not judgment
vs. category average
6%
Drops faster than category avg
Price over time - 2021 Diamondback Union 2
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
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Overview
About this bike
Get it done. Faster. The Class 3 Union 2 is fully loaded to get things done. Built on a sleek aluminum frame with internal cable routing, this e-bike is powered by a Bosch Performance Line Speed motor and a Powertube 500Wh battery. The Bosch Kiox on-board computer provides ride data at your fingertips via a handlebar remote and easy-to-read color display. The Kiox is compatible with Bluetooth heart-rate monitors for the ultimate smart ebike experience. A 10-speed Shimano drivetrain fine-tunes your pedaling, while Shimano hydraulic disc brakes keep your speed under control. Wide tires on 27.5-inch wheels take the sting out of rough pavement. With built-in lights, an integrated rack, and fenders, the Union 2 lets you cut through city traffic with ease and confidence. - 350W Bosch Performance Line Speed motor for powerful pedal assistance - Bosch Powertube 500Wh battery provides up to a 65-mile range - Shimano MT420 hydraulic disc brakes for maximum stopping power in any conditions - Shimano Deore 10-speed drivetrain offers smooth, reliable shifting - Integrated rack, fenders, and lights make getting around town easier, cleaner, and safer
Specifications
- Subtype
- Electric Active
- Category
- E-Bike
- Component Hubs
- Front: Formula, Sealed Bearing, Thru Axle Rear: Formula, Sealed Bearing, Thru Axle
- Component Rims
- Aluminum 27.5", Black Anodized, 25mm ID, Disc Specific, 32 Hole
- Component Size
- Medium, Large, X-Large
- Component Stem
- Aluminum Alloy 3d Forged
- Product Family
- Union
- Component Chain
- KMC x10e EPT, Ebike Specific
- Component Color
- Gunmetal Blue Satin
- Component Frame
- Formed 6061 T6 Oversize Aluminum Alloy, Thru Axle Dropout, Disc Brake Specific, Powertube Integrated Battery
- Component Motor
- Bosch Performance Line Speed, 85Nm Torque, 28mph
- Component Brakes
- Shimano MT420, 4 Piston Front 180mm Rotor, 2 Piston Rear 160mm Rotor
- Component Pedals
- Shoe Friendly Urban Design, Resin Body
- Component Saddle
- Custom Ergo Performance
- Component Battery
- Bosch Powertube 500Wh
- Component Charger
- Bosch 4A
- Component Headset
- Integrated, Sealed Bearing
- Component Crankset
- FSA Forged Aluminum for Bosch System
- Component Seatpost
- Aluminum Alloy Forged Head, 350mm
- Component Shifters
- Shimano Deore SL-M6000, 10 Speed
- Component Handlebar
- Aluminum Alloy
- Component Chainrings
- FSA Forged Spider, 42 tooth w/chainguard, steel
- Component Front Tire
- 27.5 x 2.4" Schwalbe Super Moto
- Component Tape Grips
- Ergo Comfort Control
- Component Brake Levers
- Shimano MT420, 2 Finger Lever
- Component Rear Derailleur
- Shimano Deore M610, SGS
- Component Accessories Extras
- Aluminum Structural Extrusion Fenders with Integrated Rear Rack, Lezyne Headlight & Taillight, Rear Mounted Kickstand
- Component Controller Display
- Bosch Kiox
- Hubs
- Front: Formula, Sealed Bearing, Thru Axle Rear: Formula, Sealed Bearing, Thru Axle
- Rims
- Aluminum 27.5", Black Anodized, 25mm ID, Disc Specific, 32 Hole
- Crankset
- FSA Forged Aluminum for Bosch System
- Pedals
- Shoe Friendly Urban Design, Resin Body
- Chain
- KMC x10e EPT, Ebike Specific
- Seatpost
- Aluminum Alloy Forged Head, 350mm
- Saddle
- Custom Ergo Performance
- Handlebar
- Aluminum Alloy
- Headset
- Integrated, Sealed Bearing
- Rear Derailleur
- Shimano Deore M610, SGS
- Stem
- Aluminum Alloy 3d Forged
- Accessories & Extras
- Aluminum Structural Extrusion Fenders with Integrated Rear Rack, Lezyne Headlight & Taillight, Rear Mounted Kickstand
- Brake Levers
- Shimano MT420, 2 Finger Lever
- Brakes
- Shimano MT420, 4 Piston Front 180mm Rotor, 2 Piston Rear 160mm Rotor
- Chainrings
- FSA Forged Spider, 42 tooth w/chainguard, steel
- Frame
- Formed 6061 T6 Oversize Aluminum Alloy, Thru Axle Dropout, Disc Brake Specific, Powertube Integrated Battery
- Shifters
- Shimano Deore SL-M6000, 10 Speed
- Tape/Grips
- Ergo Comfort Control
- Motor
- Bosch Performance Line Speed, 85Nm Torque, 28mph
- Charger
- Bosch 4A
- Battery
- Bosch Powertube 500Wh
- Color
- Gunmetal Blue Satin
- Size
- X-Large
- Controller/Display
- Bosch Kiox
- Front Tire
- 27.5 x 2.4" Schwalbe Super Moto
What to check when buying used
Inspection
Drivetrain wear
Check chain stretch, cassette teeth, chainrings, and shifting under load before negotiating price.
Inspection
Service history
Ask for service records covering bearings, brakes, drivetrain, and any frame or fork warranty work.
Inspection
Battery health
Request battery cycle count, capacity diagnostics, and motor service records.