Promax Seat-post Clamp - Alloy 31.8 mm


Reid $4.99

Sale $3.99



High quality, aluminium alloy seat-post clamp to suit a 31.8 mm seat-tube.

  • Aluminium alloy construction for strength and durability
  • Hex / allen key bolt for extra security
  • Smooth, black finish for minimal style

This is a high quality, aluminium alloy seat-post clamp, designed for a 31.8 mm seat tube. This measurement is the external diameter of the seat-tube, which is the part of the bike frame that the seat-post slides in to. This kind of seat tube is typically found on aluminium road and mountain bikes with a 27.2 mm seat-post.

The use of a hex / allen key bolt for tightening the seat-post clamp, instead of a quick-release clamp, makes the seat-post more secure and less likely to be pinched or tampered with.



Brand Promax
Colour White
Size 31.8mm

We continually work to improve our products so designs and specifications are subject to change. Please contact us to confirm if you have any questions.


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Reid Cycles ships bikes, parts and accessories anywhere in Australia!


Dispatch: 1 to 2 working days (In stock items)

Free shipping: Metropolitan and some regional areas (over $75)

  • All accessories & helmets (when purchased in the same cart as the bike)

Overseas shipping: call customer service for local distributors

Bundled & Combined shipping benefits available

Bike Assembly:

  • Bikes are shipped boxed, and 85% assembled.

  • The final assembly requires:

  • The installation of the handlebars, front wheel, pedals and saddle.

  • Adjusting the brakes and tuning the gears.

We recommend that the assembly is done by a qualified bike mechanic or other suitably qualified person.

  • Damage caused by incorrect assembly (such as installing the pedals the wrong way around) is not covered by your warranty.

  • Delivery times vary depending on couriers workload & seasonality.

  • Address must always have someone in attendance. Arrange ‘authority to leave‘ or ‘redelivery‘ directly with the courier company at your own discretion.

Please contact us if you have any questions.


FREE In Store Collection: Fully assembled & personally adjusted by an experienced Reid Cycles mechanic available with Click and Collect


For full warranty terms, please visit our Warranty Policy page

For any warranty issues,

In store sales:  contact the store

Online sales: contact the customer service team.

Customer support:

Phone numbers and email addresses on our Contact Us page.