Identify the type before removing a wheel
Find the chair model and its castor instructions. Some wheels push into a socket using a retaining ring. Others screw in or use a specific fitting. A product described as a replacement wheel can use a different system from the chair. If the maker calls for service or the fitting does not move as documented, contact the maker.
Set the chair down on a stable, protected surface according to its instructions before removing any user-replaceable castor. Leave the gas lift and chair base assembled unless the maker’s service procedure specifically requires otherwise. If the socket is split or distorted, ask about the approved replacement base or repair.
Measure the plain shaft and insertion length
Clean the shaft and use calipers across a plain part of the stem. Avoid measuring across a spring ring or a stepped shoulder. Read in millimetres and repeat in another direction. Measure from the seat of the shoulder to the tip to find the length that goes into the socket. Record the ring position and whether the shoulder sits flat.
For example, a diameter near 11 mm and a length near 22 mm describe an 11 × 22 mm candidate. A 10 × 22 mm stem can look nearly identical in a product photograph. Match the retaining shape as well and confirm any tolerance with the chair maker. A threaded stem needs a matching thread diameter and pitch.
A 10 × 22 mm listing example
The selected black Joyvita set states a 10 mm diameter and 22 mm length. The brand also sells an 11 mm version. Match the exact 10 mm variant if it fits your approved chair dimensions. A reference to a chair brand in a listing cannot substitute for checking the chair model.
10 mm stem example
Joyvita 10 mm rubber castors, black
The selected Joyvita set has a stated 10 mm stem diameter and 22 mm stem length. A separate 11 mm version is sold.
Measure the original stem and check your chair’s approved fitting. Match the retention and installed height before buying.
- 10 mm stem diameter
- 22 mm stem length
- Set of five
An 11 × 22 mm listing example
The grey HOLKIE 2-inch twin castor uses a stated 11 × 22 mm stem. Compare both measurements and the seated shape against your original. Also measure the fitted height and width of the wheel assembly. Check that it clears the chair base at each swivel angle.
Compact twin-wheel profile
HOLKIE 2-inch twin castors, grey
A compact twin-wheel replacement with a polyurethane tread and a listed 11 × 22 mm push-in stem.
Check the stem shoulder and how the complete wheel sits in the base. Confirm the tread is suitable for your exact flooring.
- 11 × 22 mm stem
- 2-inch twin wheel
- Set of five
After a maker-approved swap, confirm all wheels are fully seated, sit at the same height and roll as expected before normal use. If one is loose or needs more force than the instructions describe, stop and verify the part. See the floor and tread guide for the next check.
Common questions
Where do I measure the diameter?
Measure across the plain shaft with calipers, away from a retaining ring, thread or shoulder.
Where does the 22 mm length start?
On a push-in design, measure from the shoulder that seats against the base to the stem tip.
Can a 10 mm stem fit an 11 mm socket?
Use the approved diameter and retaining design. A loose fit can let a wheel pull out.
Do all chairs from one brand use the same stem?
Check the exact model and revision. Brands can sell more than one fitting.
What if my original castor uses a thread?
Match the thread diameter, pitch and approved length. Check the maker’s part number before ordering.
Sources and selection
Sources and Amazon UK listings checked in November 2026. Fit examples use published specifications. The selected Amazon UK listings supply the specifications for Joyvita 10 mm rubber castors, black and HOLKIE 2-inch twin castors, grey.