Key takeaways
- Use soft-tread castors on hard floors such as tiles and wood, and hard castors on carpet. The European standard EN 12529 calls these Type W and Type H.
- Most office chairs use an 11 mm by 22 mm stem, but some brands differ, so measure your old castor before you buy a replacement.
- Castors roll; glides slide. Glides suit heavy chairs that stay in one place, while castors suit chairs you move during the day.
- A chair mat or soft-tread wheels will help protect vinyl, laminate and wooden floors from scratches and wear.
Office chair castors should match your floor: soft wheels for hard floors like tiles and wood, hard wheels for carpet. Pick the wrong type and the chair either slides away on a hard floor or digs in and drags on carpet. This guide explains how to choose castors by floor, how castors differ from glides, how to check sizing before you replace a wheel, and how to protect your floors over time.
The choice matters more than most buyers expect. A castor is a small part, but it decides how safely a chair moves, how much noise it makes, and whether your floor gets scratched. We sell chairs and spares to offices, schools and homes across South Africa, so we see the same castor questions come up again and again. The answers below are practical and based on the European chair standards, not guesswork.
Why Castors Matter for Floor Safety and Smooth Movement
Castors carry the full weight of the chair and the person sitting in it, then let that weight roll across the floor. The right castor keeps movement smooth and controlled. The wrong one makes a chair feel either skittish on a hard floor or heavy and sticky on carpet. Both problems wear down the chair and the floor.
Safe movement is about grip and resistance. On a hard floor you want enough resistance so the chair does not shoot out from under you when you lean. On carpet you want enough roll so you are not fighting the chair all day. A castor matched to the floor gives you both.
Durability standards show how hard castors work. Industry chair tests roll a loaded base back and forth tens of thousands of times, including passes over small obstacles, before a design passes. That is a lot of rolling, and it explains why a worn or wrong castor fails faster than you think.
Hard Castors or Soft Castors: Match the Wheel to the Floor
The single most important rule is simple: soft castors for hard floors, hard castors for soft floors. The European standard EN 12529 splits office chair castors into two types for exactly this reason (CEN, EN 12529, 1998).
Here is what those two types mean in plain terms.
- Type W (soft castors): These have a softer tyre, usually polyurethane or a rubber tread, often in a contrasting colour. They are made for hard floors such as tiles, laminate, vinyl and wood. The soft tread grips the surface and cushions the roll, which reduces noise and scratching.
- Type H (hard castors): These are hard, usually a single plain colour of tough plastic. They are made for carpet and other soft floors. The hard wheel rolls easily over carpet pile instead of sinking into it.
Put a hard carpet castor on a tiled floor and it rolls too freely and can mark the surface. Put a soft floor castor on thick carpet and it drags, because the soft tread grips a surface that is already soft. Matching the wheel to the floor fixes both faults at once.
If you are not sure which castors came with your chairs, look at the wheels. A contrasting coloured tyre usually signals a soft Type W castor for hard floors. A plain, single colour hard wheel usually signals a Type H castor for carpet.
A quick floor-to-castor guide
| Your floor | Castor to choose | EN 12529 type |
|---|---|---|
| Carpet or carpet tiles | Hard wheel | Type H |
| Ceramic or porcelain tiles | Soft-tread wheel | Type W |
| Laminate | Soft-tread wheel | Type W |
| Vinyl or LVT | Soft-tread wheel | Type W |
| Wooden or engineered wood | Soft-tread wheel | Type W |
| Polished concrete | Soft-tread wheel | Type W |
If your workspace mixes floor types, for example carpet at desks and tiles in a breakout area, pick castors for the floor where the chair spends most of its time, or use a chair mat in the second zone.
Castors or Glides: When Wheels Are Not the Answer
A castor rolls; a glide slides or stays put. Castors suit any chair you move during the day, such as a task chair at a desk. Glides suit heavy chairs that stay in one place, such as boardroom chairs around a fixed table, reception seating or visitor chairs. Choosing between them is about how the chair is used, not just the floor.
Glides are fixed feet, pads or discs fitted to the base instead of wheels. They give a chair a planted, stable feel. That is useful for a visitor chair that should not roll away when someone sits down, or a boardroom chair that stays tucked under the table.
Think about these points when you choose:
- Movement: If people need to move freely between a desk, a drawer unit and a printer, fit castors. If the chair should stay put, fit glides.
- Weight and stability: Heavier executive and boardroom chairs can feel more stable on glides, especially on hard floors.
- Floor type: Felt or soft-faced glides are kinder to wooden and tiled floors. Hard plastic glides can scratch, so check the glide face before fitting.
- Noise: Glides are silent because nothing rolls. In a quiet boardroom that can be worth more than mobility.
Some chairs let you swap between castors and glides because both use a similar stem fitting. If you want to convert a set of chairs, send us the chair model and a photo of the current fitting and we will confirm what fits before you order.
For more on how armrests, mechanisms and base choices shape comfort, our guide to office chair mechanisms explains the moving parts that sit above the castors.
Measure Before You Replace: Stem Size and Fitting
Before you buy replacement castors, measure the stem on your old wheel, because a castor that looks right can still fail to fit. Most office chairs use a grip-ring stem around 11 mm in diameter and 22 mm long, which is why so many replacement castors are sold as a near-universal fit. Many chairs are not all chairs, so a quick check saves a wasted order.
To remove an existing castor, hold the chair base and pull the wheel straight out. Grip-ring stem castors are held by a sprung ring and pull free with firm, steady force. Then check these three things.
- Stem type. Most task chairs use a smooth, round grip-ring stem. Some chairs use a threaded stem that screws in, and a few older or specialist chairs use a square or stepped fitting. A grip-ring castor will not fit a threaded socket.
- Stem diameter and length. Measure the diameter across the stem and the length from the top of the wheel housing to the tip. The common size is about 11 mm by 22 mm, but brands vary. Some well-known flat-pack chairs use a slightly different stem, so a standard castor may be loose or too tight.
- Wheel diameter. Larger wheels roll more easily over thresholds and carpet. A 60 mm or 65 mm wheel clears small bumps better than a 50 mm one. Check there is clearance under the base.
If the old castor is damaged and hard to measure, take a photo next to a ruler and send it to us. Getting the stem right the first time means the new castors click in and hold firmly, which matters because chair tests check that castors stay put under load rather than falling out.
How Many Castors and What Load Can They Take
A standard office chair has five castors on a five-star base, which spreads the load and keeps the chair stable. Five points of contact resist tipping far better than four, which is why the five-star base is the norm on task and executive chairs. When you replace castors, replace the full set of five so the chair sits level and rolls evenly.
Load capacity is where buyers often go wrong. It is tempting to look for a single weight number on a castor, but a chair is tested as a whole, not wheel by wheel. BIFMA makes this point directly: a simple static load rating can mislead, because real use involves dynamic forces, repeated rolling and cycling that a static number ignores (BIFMA, Chair Load Memo, 2016).
So treat the chair's rated user weight as your guide, not a castor's standalone figure. If you need chairs for heavier users, choose a chair built and tested for that weight, with a matching base and castors, rather than fitting heavy-duty wheels to a light chair.
A few practical pointers on quantity and load:
- Always run five matched castors, not a mix of old and new types.
- Replace all five at once so wear and height stay even.
- For heavier users, choose a chair rated for the weight rather than upgrading castors alone.
- Keep spare castors for a large chair fleet, as one worn wheel can wobble a whole chair.
If you are costing a full chair fleet rather than spares, plan castor spares into the budget so one worn wheel never takes a chair out of use.
Protecting Tiles, Laminate and Wooden Floors
Soft-tread castors and a clean floor are your best defence against scratches on hard surfaces. On tiles, laminate, vinyl and wood, the damage usually comes from two sources: the wrong hard castor, or grit caught in a correct soft castor. Fixing both keeps floors looking good for years.
Start with the right castor. Soft-tread Type W castors are designed for hard floors and spread load through a softer tyre that is kinder to the surface. Their broader, cushioned contact patch is what makes them gentler on tiles, vinyl, laminate and wood than a hard carpet wheel.
Then add a second layer of protection where it helps.
- Chair mats: A mat under a desk chair takes the wear instead of the floor. Hard-floor mats and carpet mats differ, so choose one made for your surface.
- Rugs or runners: In reception and breakout areas, a rug protects a wooden floor and defines the space.
- Felt glides for static chairs: For visitor and boardroom chairs that do not roll, felt-faced glides slide softly without scratching.
Wood and laminate deserve extra care because the finish is thinner than it looks. A common piece of flooring advice is to fit protectors under any furniture that moves, so it cannot scratch or dent the surface. The same thinking applies to an office chair rolling over an engineered wood floor all day.
Reception, Hospitality and Public Spaces
Reception and public areas usually need glides or soft castors, because the floors are often hard and the chairs are either stationary or used by many different people. A reception chair that rolls away as a visitor sits down is a safety risk, so a planted glide or a firm soft castor is often the better choice.
In a hospitality or public venue, think about three things. First, the floor is usually tile, polished concrete or wood, which calls for soft-tread castors or felt glides. Second, the chair may be lifted and moved by staff rather than rolled, which favours glides. Third, public chairs take heavy daily use, so durable fittings matter.
For lounge and tub chairs in a reception area, fixed feet or glides are usually fitted from the factory and need no wheels at all. For a staff hot desk or shared workstation behind the scenes, castors make sense so people can move freely between positions during the day.
Maintaining Castors for a Longer Life
Clean castors roll better, last longer and protect floors, so a few minutes of maintenance pays off. Most castor problems come down to hair, thread, dust and grit wrapping around the axle or lodging in the tread. Left alone, that build-up stiffens the roll and turns a smooth soft castor into a scratcher.
Work through this simple routine every few months, or more often in a busy or dusty space.
- Lift and inspect. Tip the chair on its side and look at each wheel. Hair and thread usually sit around the axle.
- Clear the build-up. Pull out hair and thread with your fingers or tweezers, and wipe grit off the tread with a damp cloth.
- Check for flat spots. A castor with a worn flat patch will bump and drag. Replace a flatted wheel rather than living with it.
- Test the roll. Set the chair down and roll it. Even, quiet movement means the castors are healthy.
Keep the floor clean too. Grit on a tiled or wooden floor is the main cause of fine scratches, and a soft castor will press that grit into the surface as it rolls. Regular sweeping or vacuuming around desks protects both the castors and the floor.
If a chair still rolls badly after cleaning, the castors are likely worn out. Replacing a set of five is a low-cost fix that can make an older chair feel almost new, which is often cheaper than replacing the whole chair.
Common Castor Mistakes to Avoid
The most common castor mistake is buying on price or looks instead of matching the wheel to the floor. A cheap hard castor on a wooden floor costs far more in scratched flooring than it saves on the wheel. A few other errors come up often, and all are easy to avoid once you know them.
- Ignoring the floor type. This is the big one. Always start with your floor, then choose the castor.
- Mixing castor types on one chair. Five matched castors keep the chair level and rolling evenly. A mixed set wobbles.
- Assuming every stem is the same. Measure first. A standard-looking castor may not fit a flat-pack or specialist chair.
- Overloading a light chair. Fitting heavy-duty castors does not turn a light chair into a heavy-duty one. Buy the right chair instead.
- Skipping floor protection. Even correct soft castors benefit from a chair mat on wood and laminate.
- Leaving grit in the tread. A dirty soft castor scratches. Clean wheels protect floors.
Avoiding these mistakes is mostly about slowing down for one minute before you buy. Check the floor, measure the stem, and buy a full matched set. The same buy-right-once thinking that applies to castors applies to a whole home office or workplace fit-out.
Choosing Castors for Different Workspaces
The right castor depends on who sits in the chair and where. A busy office, a classroom, a home study and a reception area all put different demands on the wheels, so it helps to match the castor to the setting rather than buying one type for everything.
Use this quick reference by workspace.
| Workspace | Typical floor | Best fitting |
|---|---|---|
| General office at desks | Carpet tiles | Hard castors (Type H) |
| Office on hard floors | Tile, vinyl or wood | Soft-tread castors (Type W) |
| Home office | Laminate or wood | Soft-tread castors plus a chair mat |
| Reception or lounge | Tile or wood | Glides or soft castors |
| Boardroom | Carpet or wood | Soft castors, or glides for fixed chairs |
| Classroom or training | Vinyl or tile | Soft-tread castors, or glides on stacking chairs |
In a classroom, chairs are often stacked and moved rather than rolled at a desk, so glides or sturdy soft castors suit better than light task wheels. If you are fitting out a school, plan the seating around how chairs are stored and moved, not just how they are sat in.
For a home office on a wooden or laminate floor, soft castors plus a chair mat is the safest combination. It keeps the chair rolling smoothly and takes the daily wear off a floor that is expensive to refinish.
Browse Chairs and Castors, or Send Us Your List
Choosing castors comes down to three steps: match the wheel to your floor, measure the stem before you replace, and add a chair mat on wood or laminate. Get those right and your chairs roll smoothly, stay quiet and leave your floors unmarked for years.
If you are ready to choose, browse our office chairs range to see task, mesh and executive chairs, or the wider office furniture range for a full fit-out. Not sure which castors or chairs suit your floors and your team? Send us your product list or a project brief with a note on your floor types. Our team is based in Centurion, and we will help with selection, a formal quotation and dependable countrywide delivery. We do not have a showroom, so comparing online or sending us your list is the quickest way to get the right fit.
Frequently asked questions
What is the difference between a castor and a glide?
A castor is a wheel on a stem that lets a chair roll. A glide is a fixed foot or disc that slides or stays put. Castors suit chairs you move often. Glides suit heavy chairs that stay in place, such as boardroom or visitor chairs.
Which office chair castors are best for wooden and tiled floors?
Choose soft-tread castors, often called Type W under the EN 12529 standard. They have a softer polyurethane or rubber tyre that grips hard floors and reduces scratching. Hard castors are made for carpet and can mark tiles, laminate and wood.
Are office chair castors a universal size?
Many office chairs share an 11 mm diameter by 22 mm long stem, so a wide range of replacement castors fit them. Some brands use a different stem or a threaded fitting, so always measure your old castor first or send us a photo before ordering.
How do I stop my office chair scratching the floor?
Fit soft-tread castors made for hard floors, or place a chair mat under the chair. Keep the wheels clean, as grit trapped in a castor is a common cause of scratches on tiles, vinyl and wood.