The whole bottom half of a chair, with the lowest load figure here
A four-part kit — base, gas cylinder, bottom plate and five casters — that publishes a 350 lb capacity and 110 lb per caster: the lowest figures on this shelf, though five casters at 110 lb make 550, not 350.
Topdeep complete base kit with cylinder, plate and casters
Best for: A chair where more than one thing has failed, and the seat is the only part worth keeping.
This is the most completely specified part in this hub. A 28 in base, a gas cylinder with 5 in of travel giving a 14.5 to 19.5 in range, a seat bottom plate with a 6 by 10.2 in hole pattern, and five 60 mm (2.36 in) casters — with a stated capacity of 350 lb and, separately, 110 lb per caster. Multiply and the two do not agree: five casters at 110 lb make 550 lb, so the 350 lb presumably reflects another part of the kit, which the listing does not say.
That matters because the rest of this shelf does not. Two other 28 in bases here claim 2,500 lb; caster sets claim 650, 700, 1,000 and 2,000 lb. None publishes a method and none breaks the figure down. The one kit that breaks its figure down arrives at a total seven times smaller than its neighbors — and even its two figures disagree, which is the useful thing to know about all of them.
What you get for the price is four parts instead of one: the base, the cylinder, the plate and the wheels, which is everything below the seat except the tilt mechanism sold separately on this shelf. Topdeep publishes its own weight at 22.5 lb, describes a three-step fit, and is candid that the third step needs a rubber hammer. The casters are 2.4 in rather than the 2 in standard everywhere else here, which rolls better over a threshold and raises the seat slightly.
Read on the day this page was built: $66 at the American Amazon shop.
Read from Keepa on the day this page was last revised; stock and price both move without notice.
Best for: A chair where more than one thing has failed, and the seat is the only part worth keeping.
Prices quoted in this text were read on 2026-10-13. The live price is at the top of the page.
Nothing on the page explains it, and the kit's own figures do not quite agree: 350 lb for the kit, but 110 lb per caster, which over five casters makes 550 lb. The lower figure is probably the limit of the weakest part, but the listing does not say so. Two 28 in bases alongside it claim 2,500 lb with no per-caster figure and no method — more than seven times as much for the same part at the same diameter. None of the three gives a test.
Four things, which the listing itemizes: one bottom plate, one gas cylinder, one base and five casters. That covers the base, the height mechanism and the wheels — everything below the seat except the tilt mechanism, which is sold separately on this shelf. The published figures that matter are the 6 by 10.2 in mounting hole pattern for the plate, the 5 in cylinder travel giving 14.5 to 19.5 in of adjustment, and the 60 mm (2.36 in) caster diameter.
A complete 28 in base that ships with both casters and bell glides, so the same chair can be made to roll or to stand still.
Best for: A chair that should stop rolling — a stool at a bench, or a chair on a sloping floor.
Quiet-rolling nylon replacement casters with a polyurethane coating, precision bearings, and a dual-wheel design for stability, fitting 11×22mm (0.43 × 0.87 in) stems.
Best for: A quiet, budget replacement for worn or noisy stock casters, on hard flooring.
Polyurethane casters on steel frames with the lowest load claim among the caster sets on the shelf, 650 lb — and the only listing here that qualifies its own carpet performance.
Best for: Hard floors and low pile, from a listing that tells you where it is weaker.
A pneumatic squeeze-handle converter on an aluminum frame, rated to 33 lb — and the only listing on this shelf that names the material of its own work surface.
Best for: A converter adjusted several times a day, where a squeeze handle beats a spring you fight.
A fully assembled two-tier converter with a dual-handle lift and eleven discrete height settings — and the only listing on this shelf that publishes no weight capacity at all.
Best for: A desk where it must work out of the box and the height must land in the same place every time.
The middle of three VIVO risers on this shelf, with a pneumatic spring lift, touch height locking and a 26 lb rating between its 22 lb and 33 lb siblings.
Best for: A monitor and a laptop together, where 22 lb is too little and 33 lb is more than needed.