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What is the size of the seat post clamp / seat post of the Urban Arrow Family?

The seatpost clamp size of the Urban Arrow Family and FamilyNext is 36.4 mm, and the seatpost size itself is 31.6 mm.

Please note that not all seatposts can be used on the Urban Arrow Only seatposts approved by Urban Arrow may be used on our bikes (due to the seat tube angle and other specifications).

The seatposts and seatpost clamp that can be used on these bikes are:

2022 and newer models

  • Standard: Grooved seatpost, Promax SP-2052 (31.6x400 mm) UA part number: 380022400

  • Seatpost clamp with locking bolt, Promax 403QX (36.4) UA part number: 380022700

2021 and older models
The above items also fit older models, but the anti-theft function will not work without modification of the frame.

Note: Always have your seatpost and saddle mounted by an Urban Arrow dealer It is essential that both the seatpost and the saddle are installed correctly, using the proper tools and instructions (as stated in the product manual).