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Diamondback Union 1

Diamondback Union 1 2021



Colour / Onyx Matte

Size / Medium, Large, X-Large

Manufacturer Website

At a glance

The 2021 Diamondback Union 1 is an hybrid aluminium mountain bike. It is priced at $3,500 USD, comes in a range of sizes, including Medium, Large, X-Large and a shimano drivetrain. The bike is part of Diamondback's Union 1 range of mountain bikes.

- 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

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 400Wh
  • 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
    Tektro M735, 4 Piston Front 180mm Rotor, 2 Piston Rear 160mm Rotor
  • Handlebar
    Aluminum Alloy 3D Forged
  • 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 1?

A 2021 Diamondback Union 1 is typically priced around $3,500 USD when new. Be sure to shop around for the best price, and also look to the used market for a great deal.

Q: Where to buy a 2021 Diamondback Union 1?

The 2021 Diamondback Union 1 may be purchased directly from Diamondback.

Q: What size 2021 Diamondback Union 1 should I get?

The 2021 Diamondback Union 1 comes in sizes Medium, Large, X-Large. After measuring your height, use the size chart below to find the typical Diamondback Union 1 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 - 158cm4'10" - 5'2"XS
158cm - 168cm5'2" - 5'6"S
168cm - 178cm5'6" - 5' 10"M
178cm - 185cm5'10" - 6'1"L
185cm - 193cm6'1" - 6'4"XL
193cm - 198cm6'4" - 6'6"XXL


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