Fitness
Buying guides for fitness, ranked by the noise figures makers publish.

Quietest smart trainer: four models tie at 56 dB at 25 km/h
Four direct-drive smart trainers state exactly 56 dB at 25 km/h from 1.5 m: Van Rysel's D500 and RCR and Magene's T300 and T200. Five more Magene models promise under 56 dB at that speed, and Saris rates the H3 Plus 59 decibels at 20 mph. Wahoo, Garmin Tacx and Elite print no figure.

Quiet exercise bike for an apartment: what the dB claims cover
MERACH prints the lowest figure for any exercise bike, "under 15dB" for its S19 Pro recumbent, with no cadence, resistance level or distance. On spin bikes, JOROTO's X4S and the YOSUDA EB1 claim under 20 dB. Peloton, Schwinn and NordicTrack print none, so the manuals on mats, levelers and floors count.

Quietest rowing machine: what each maker's decibel figure covers
Wenoker's R10 is the quietest rowing machine we can verify on its maker's terms: under 30 dB, which Wenoker says does not rise as you row faster. MERACH and Pooboo label magnetic rowers under 20 dB in images with no condition; Aviron says about 60 decibels for its fan-and-magnet rower; Concept2 and Hydrow give none.

The quietest treadmill for running, and what 70 dB means
The Technogym Run is the quietest running treadmill you can verify with a runner on it: 57 dB with an 85 kg user at 10 km/h, the only figure taken that way. BowFlex and Horizon manuals promise no more than 70 dB at 7.5 mph with nobody on it. The under 45 dB claims give no conditions at all.

The quietest walking pads, and what their decibel claims are worth
A quiet walking pad is sold on numbers like 35dB and under 45 dB, printed with no speed or distance. Three makers now say what their figure covers: idling, no load or top speed. Who says what, which pads can be compared, and what keeps a quiet walking pad quiet downstairs.

The quietest massage guns
Massage gun brands compete on quietness, but the biggest name publishes no decibel figure at all. See which ones publish a number, what it is attached to, and which are quietest on paper.

The quietest treadmills for an apartment, by what makers publish
Seven of the treadmill makers here state a noise figure, and only BowFlex and Horizon give the speed, load and listening position behind theirs. What each one states, and what really reaches your neighbors.