Backrest Upright adjustment Knob
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Backrest Upright adjustment Knob

$26.39
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BACKREST UPRIGHT ADJUSTMENT KNOB Replacement knob • 30-second installation • No tools required WHAT THIS KNOB DOES The backrest upright adjustment knob controls the vertical height position of your backrest. Loosen the knob, slide your backrest up or down the vertical bar to position it exactly where your lower back needs support, then tighten the knob to lock it in place. This lets you customize the lumbar support zone to match your specific spine height and body proportions. WHY VERTICAL POSITIONING MATTERS: Everyone's lumbar curve sits at a different height. A 5'4" engineer and a 6'2" engineer need their backrest positioned completely differently to hit the right support zone. Without this knob, you can't adjust the backrest height—and without proper lumbar positioning, ZenWave™ technology can't do its job. You're stuck with whatever random height t

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