The first question on a standing-desk enquiry is almost always "single or dual motor?" — and it is the spec buyers fixate on while understanding it the least. The motor count is real, but it is shorthand for three things that actually matter: lift speed, load rating and stability. Put numbers on each and the choice stops being a guess.
Lift speed, in mm per second
A single-motor frame typically travels around 25 mm/s. A dual-motor frame runs faster — commonly quoted around 35–45 mm/s, roughly 1.4 to 1.8 inches per second, which is on the order of 30–50% quicker. That difference sounds trivial on paper and is not in practice. Over a 65 cm sit-to-stand travel, 25 mm/s is about 26 seconds; 40 mm/s is about 16. A desk that reaches standing height in sixteen seconds gets used several times a day. One that takes twenty-six gets left where it is, and the health benefit I describe in our sit-stand evidence note quietly disappears.
Load rating
Single-motor frames usually carry around 70–80 kg. That covers a monitor or two, a laptop and the usual desk clutter, and it is plenty for a home setup. Dual-motor frames commonly rate to 120–140 kg, which is the band you want for heavy multi-monitor arms, a curved ultrawide, or any desk that gets leaned on. One thing buyers forget: the load rating includes the weight of the desktop itself. A thick solid-wood top can eat 20–30 kg of a single motor's budget before you put anything on it, so the "80 kg" frame is really an "50 kg of equipment" frame once the top is on. State the desktop weight when you ask for a rating and you avoid that trap.
Stability and the duty cycle
Two motors driving two legs in sync wobble less at full standing height than one motor pushing through a cross-bar linkage to a passive leg. Wobble is worst at full extension — exactly where you want it least — and it is the single complaint that turns a buyer off standing desks. Then there is duty cycle: how long the motor can run before it needs to rest, usually quoted as something like "10% — 2 min on, 18 min off." A frame in a busy office gets raised and lowered far more often than one in a home study, and a thin duty-cycle spec is where a cheap frame quietly burns out. We build desk frames and test them to ANSI/BIFMA X5.5 and EN methods for desks; testing to either can be arranged per order rather than printed in advance of your configuration.
The controller and the warranty are part of the spec
The motor gets the attention, but the controller decides whether the desk is pleasant to live with — anti-collision sensing that stops the top before it crushes a drawer or a chair arm, soft start and stop so coffee does not slosh, and memory presets so two users share one desk. And the motor is the part most likely to need replacing over a contract desk's life, which loops straight into warranty and spare-parts: a motor you can swap as a module beats a sealed frame you have to scrap.
Two legs or three, and the desktop width
Motor count is not the only frame variable worth a number. Leg stages matter too: a two-stage leg has a lower minimum height and a smaller height range than a three-stage leg, which can be the difference between a desk a short user can sit at comfortably and one that bottoms out too high. And frame width has to suit the desktop — a frame set for a 1.2 m top under a 1.8 m desktop leaves long unsupported overhangs that flex and amplify wobble, no matter how good the motors are. So when we quote a frame we match the leg stages to the height range your market expects and the frame width to your actual desktop size, rather than shipping one frame and hoping the top fits. These are cheap things to get right at the spec stage and expensive complaints to field later.
The trade-off, stated plainly
Single motor is not "worse" — it is the right buy for a home-office line at a sharp price, and we ship plenty of it. The mistake is putting single-motor frames into a contract order for an office where the desks get raised and lowered several times a day by different people. There the dual motor earns its cost in speed, stability and a duty cycle that survives the use. The few dollars saved per frame come back as motor-replacement claims and a reseller who stops reordering. We would rather match the frame to the duty than win a quote on a number that fails in the field.
Send us the destination market, the desktop size and weight, and how hard the desks will be used, and we will spec the motor, the load rating and the controller to match. Reach us via the contact form, or see the full range on our products page. More on which desk standard your market needs in our EN 527 vs BIFMA X5.5 note.