Description
The Promax 335QX is a quick-release seat clamp for bikes where the saddle height gets changed often and reaching for a hex key every time gets old quickly.
The lever lets you open, adjust and re-clamp the seatpost by hand, making it useful on shared bikes, growing-rider setups and anything that genuinely needs regular height changes.
Match the clamp size to the outside diameter of the frame’s seat tube, not the seatpost itself.
About PROMAX
Promax develops bicycle components across BMX and other cycling disciplines, with a range covering cockpit, braking, drivetrain and control parts. The brand’s BMX presence is particularly visible in race-oriented products such as brakes, stems, seat clamps, chainrings and related hardware, where low weight, adjustment and reliable fit are important. Promax approaches the bicycle as a system of functional components rather than building its identity around one narrow product category. That...
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