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Diamondback Union 2

Diamondback Union 2 2021



Colour / Gunmetal Blue Satin

Size / Medium, Large, X-Large

At a glance

The 2021 Diamondback Union 2 is an hybrid aluminium road bike. It is priced at $4,100 USD, comes in a range of sizes, including Medium, Large, X-Large and a shimano drivetrain. The bike is part of Diamondback's Union 2 range of road bikes.

- 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

Where To Buy



  • Frame
    Formed 6061 T6 Oversize Aluminum Alloy, Thru Axle Dropout, Disc Brake Specific, Powertube Integrated Battery
  • Motor
    Bosch Performance Line Speed, 85Nm Torque, 28mph
  • Battery
    Bosch Powertube 500Wh
  • Hubs
    Front: Formula, Sealed Bearing, Thru Axle
    Rear: Formula, Sealed Bearing, Thru Axle
  • Tires
    [F] 27.5 x 2.4" Schwalbe Super Moto
  • Chain
    KMC x10e EPT, Ebike Specific
  • Crank
    FSA Forged Aluminum for Bosch System
  • Rear Derailleur
    Shimano Deore M610, SGS
  • Shifters
    Shimano Deore SL-M6000, 10 Speed
  • Brakeset
    Shimano MT420, 4 Piston Front 180mm Rotor, 2 Piston Rear 160mm Rotor
  • Handlebar
    Aluminum Alloy
  • Saddle
    Custom Ergo Performance
  • Stem
    Aluminum Alloy 3d Forged
  • Grips
    Ergo Comfort Control
  • Headset
    Integrated, Sealed Bearing


Q: How much is a 2021 Diamondback Union 2?

A 2021 Diamondback Union 2 is typically priced around $4,100 USD when new. Be sure to shop around for the best price, and also look to the used market for a great deal.

Q: What size 2021 Diamondback Union 2 should I get?

The 2021 Diamondback Union 2 comes in sizes Medium, Large, X-Large. After measuring your height, use the size chart below to find the typical Diamondback Union 2 size for your height. Remember that these sizes are a general guide and bike sizes can vary between riders and bikes. The best way to find your size is to go for a test ride.

Rider Height (cm) Rider Height (in) Frame Size
148cm - 158cm 4'10" - 5'2" XS
158cm - 168cm 5'2" - 5'6" S
168cm - 178cm 5'6" - 5' 10" M
178cm - 185cm 5'10" - 6'1" L
185cm - 193cm 6'1" - 6'4" XL
193cm - 198cm 6'4" - 6'6" XXL


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