Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Diamondback
2021 Diamondback Union 1
Previous used estimate
$1,173 - $1,207
Actual value depends on condition, size, and local demand.
Value Guide market data · 2021 Diamondback Union 1
12-month projected trend
12%
Direction and magnitude, not judgment
vs. category average
5%
Drops faster than category avg
Price over time - 2021 Diamondback Union 1
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
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Compare Union 1 models
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Overview
About this bike
Get it done. The Class 3 Union 1 gets 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 integrated 400Wh battery. The Bosch Purion on-board computer lets you focus on the important things with a minimalist design and with all the data you need at the touch of a button. A 10-speed Shimano drivetrain fine-tunes your pedaling, while Tektro hydraulic disc brakes keep your speed under control. Wide tires on 27.5-inch wheels take the sting out of rough pavement. With an integrated rack and fenders, the Union 1 lets you cut through city traffic with ease and confidence. - 350W Bosch Performance Line Speed motor for powerful pedal assistance - Bosch Powertube 400Wh battery provides up to a 55-mile range - Tektro M735 hydraulic disc brakes for maximum stopping power in any conditions - Shimano Deore 10-speed drivetrain offers smooth, reliable shifting
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
- Onyx Matte
- 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
- Tektro M735, 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 400Wh
- Component Charger
- Bosch 4A
- Component Headset
- Integrated, Sealed Bearing
- Component Crankset
- FSA Forged Aluminum for Bosch System
- Component Seatpost
- Aluminum Forged Head, 350mm
- Component Shifters
- Shimano Deore SL-M6000, 10 Speed
- Component Handlebar
- Aluminum Alloy 3D Forged
- 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
- Tektro M735, 2 Finger Lever
- Component Rear Derailleur
- Shimano Deore M610, SGS
- Component Accessories Extras
- Aluminum Structural Extrusion Fenders with Integrated Rear Rack, Rear Mounted Kickstand
- 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 Forged Head, 350mm
- Saddle
- Custom Ergo Performance
- Handlebar
- Aluminum Alloy 3D Forged
- 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, Rear Mounted Kickstand
- Brake Levers
- Tektro M735, 2 Finger Lever
- Brakes
- Tektro M735, 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 400Wh
- Color
- Onyx Matte
- Size
- X-Large
- 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.