Rubber vs Polyurethane vs Nylon vs Cast Iron Castor Wheels: Which Is Right for Your Floor?

Rubber vs Polyurethane vs Nylon vs Cast Iron Castor Wheels: Which Is Right for Your Floor?

The short answer

The floor decides the wheel. A castor that rolls beautifully on a workshop slab can chatter on tiles, sink into carpet or scratch a timber floor.

  • Polyurethane (PU) is the best all-rounder. It's quiet, kind to floors and carries heavy loads. If you're unsure, start here.
  • Rubber is the quietest and gentlest on delicate floors such as tiles, timber and vinyl, but takes more effort to push under heavy loads.
  • Nylon rolls the easiest on smooth hard floors and carpet, and shrugs off water and chemicals, but it's noisy and can mark softer floors.
  • Cast iron is the toughest choice for very heavy loads on rough concrete, but it's loud and can damage finished floors.

Getting this right isn't just about comfort. WorkSafe Victoria lists "castors and wheels suited to the floor surface" as a minimum requirement for workplace trolleys. Below, we compare all four materials floor by floor, then show which one we'd pick for workshop trolleys, office furniture, cool rooms and outdoor bins.

At a glance: which wheel for which floor?

Use the first table to match a wheel to your floor, and the second to compare how each one performs. These are general guides; individual products vary, so always check the load rating and specifications on the product page.

Floor by floor

Swipe sideways to see the full table →

Floor Rubber Polyurethane Nylon Cast iron
Epoxy and sealed concrete Good Best OK, but noisy Avoid: can chip coatings
Tiles, timber and vinyl Best Very good Can scratch or mark Avoid
Carpet Hard to push OK Best Not suitable
Rough or unsealed concrete OK Good Noisy, rattles Best for very heavy loads
Outdoors (asphalt, pavers, gravel) Good in large sizes Good on hard surfaces Poor OK on hard surfaces, loud

Performance compared

Swipe sideways to see the full table →

Rubber Polyurethane Nylon Cast iron
Noise Very quiet Quiet Noisy Loud
Floor marking Grey rubber is non-marking; black rubber can leave marks Non-marking Can scuff or scratch soft floors Can dent and scratch
Water resistance Good Good Excellent Can rust if left wet
Oils and chemicals Poor: oils and solvents break rubber down Good against many chemicals Excellent Good
Rolling effort Highest, especially when heavily loaded Low Lowest on smooth floors Low on smooth concrete
Shock absorption Excellent Good Poor None
Load capacity Light to medium Medium to very heavy Light to heavy Heavy to very heavy

The trade-off in one line: the softer the wheel, the quieter it is and the kinder it is to floors, but the harder it is to push under load. Polyurethane sits in the sweet spot, which is why it's our default recommendation.

Rubber castor wheels

Rubber is the quietest, gentlest wheel you can buy. It grips the floor, soaks up bumps and protects delicate surfaces, which makes it the go-to for anywhere noise and floor damage matter.

Strengths

  • Very quiet, even over tile grout and floor joins
  • Grey rubber is non-marking, so it's safe on tiles, timber, vinyl and polished concrete
  • Absorbs shock and vibration, protecting fragile loads
  • Good grip on smooth or slightly wet floors

Limits

  • Takes the most effort to push, and that gets worse as the load increases
  • Oils, greases and solvents break rubber down, so keep it out of workshops and kitchens where spills are common
  • Can develop flat spots if equipment sits loaded in one place for long periods
  • Lower load ratings than PU or nylon of the same size

Elastic rubber is a step up. Elastic (resilient) rubber, often blue or grey, keeps rubber's quiet ride and floor protection but bounces back better and rolls more easily than standard rubber.

Best for: furniture and display units, hospitality and retail trolleys, shelving on tiles or timber, and anything moved in homes, offices, schools or aged care.

From our range:

  • Light Duty Castors: 75 mm grey rubber castors rated to 60 kg, and 50 mm rubber bolt hole castors for furniture
  • Medium Duty Castors: 80 mm blue elastic rubber castors rated to 100 kg each
  • Heavy Duty Castors: 206 mm (8") solid rubber castors rated to 230 kg, for rougher ground and outdoor use
  • Castor Sets: grey rubber and elastic rubber sets of four

Polyurethane (PU) castor wheels

Polyurethane is the wheel we recommend most often. It's tough enough for heavy industrial loads but soft enough to protect floors and keep noise down, so it suits most indoor floors.

Strengths

  • Quiet, smooth ride that absorbs shock and vibration
  • Non-marking and gentle on epoxy, sealed concrete, tiles and timber
  • Rolls easily, even under heavy loads
  • Resists abrasion, cuts and many workshop chemicals
  • Carries far more weight than rubber of the same size

Limits

  • Costs a little more than basic nylon or rubber
  • Has slightly more rolling resistance than nylon on very smooth floors
  • Hard debris such as metal swarf can embed in the tread over time, so sweep floors in machining areas

PU on cast iron gives you the best of both. Many heavy-duty castors have a polyurethane tread bonded to a cast iron centre. The iron core gives strength and load capacity, while the PU tread protects the floor and keeps the noise down.

Best for: workshop and warehouse trolleys, tool chests, workbenches, racking, hospital and laboratory carts, and any trolley that travels over mixed indoor floors.

From our range:

  • Medium Duty Castors: red urethane castors in 80 mm and 100 mm, rated to 100 kg each
  • Heavy Duty Castors: 100 mm urethane rated to 270 kg, PU-on-cast-iron castors in 100 mm and 125 mm rated to 300 kg and 350 kg, and 150 mm urethane rated to 450 kg
  • Castor Sets: PU sets of four, including 400 kg rated 100 mm and 480 kg rated 125 mm sets

Nylon castor wheels

Nylon is hard, light and slippery, so it rolls with very little effort. It's also unbothered by water, oils and most chemicals, which is why it's a favourite in wet areas, food processing and on carpet.

Strengths

  • The lowest rolling effort of the four on smooth hard floors
  • The best of the four on carpet, because the hard wheel doesn't sink into the pile
  • Resists water, oils and most chemicals, and won't rust
  • High load capacity for its size and weight
  • Low cost

Limits

  • Noisy, especially on tiles, uneven concrete or anywhere with grout lines
  • Transmits every bump to the load, so it's not ideal for fragile goods
  • Can scuff or scratch timber, vinyl and other soft floors
  • Can lose grip on wet, smooth floors, so fit brakes where equipment needs to stay put

Best for: carpeted offices, wet and washdown areas, chemical stores, food processing, and light DIY projects on hard floors.

From our range:

Cast iron castor wheels

Cast iron is the heavyweight. It won't flatten, cut or wear down under loads that would destroy softer wheels, and it handles hot, rough industrial floors that other materials can't.

Strengths

  • Very high load capacity
  • Practically indestructible on rough concrete, and unharmed by sharp debris, swarf or grit
  • Doesn't deform under heavy static loads
  • Copes with heat better than rubber or plastic wheels

Limits

  • Loud, especially on rough surfaces
  • No cushioning, so every bump goes straight into the load and the frame
  • Can chip epoxy coatings and damage tiles, timber and polished concrete
  • Can rust if left wet, so keep it away from washdown areas

Want cast iron strength with less noise? Choose a polyurethane tread on a cast iron centre (see the PU section above). You keep most of the load capacity and gain a quieter, floor-friendly ride.

Best for: heavy industrial trolleys, foundries and factories with rough concrete floors, and large waste bins where toughness matters more than noise.

From our range:

Which wheel for the job? Four real-world examples

Workshop trolleys

Our pick: polyurethane, 100–125 mm.

Workshop floors are usually sealed or epoxy-coated concrete, with oil drips, grit and the odd dropped bolt. Polyurethane rolls easily under heavy tools and parts, won't chip the epoxy, and stands up to oil far better than rubber. For very heavy trolleys on rough or unsealed concrete, step up to PU on a cast iron centre.

Use two swivel castors with brakes and two fixed, and sweep regularly so swarf doesn't embed in the tread.

Shop: Heavy Duty Castors · Castor Sets

Office furniture

Our pick: nylon on carpet; rubber or PU on hard floors.

The rule is simple: hard wheels for soft floors, soft wheels for hard floors. On carpet, a hard nylon wheel rides on top of the pile instead of sinking in, so mobile pedestals, whiteboards and storage units glide. On timber, vinyl or tiles, a soft grey rubber or PU wheel is quiet and won't scratch the finish.

Shop: Light Duty Castors · Medium Duty Castors

Cool rooms and freezers

Our pick: a stainless steel castor with a nylon or PU wheel.

Cool rooms are cold, often wet, and cleaned constantly. Food Standards Australia New Zealand requires potentially hazardous food to be kept at 5°C or colder, so the castors on cool-room racks and trolleys live in the cold full time. Nylon and PU wheels cope well with cold and moisture, while standard rubber can stiffen in the cold. A stainless steel frame won't rust from condensation and washdowns.

For freezers or equipment that also goes near ovens, our 100 mm monolithic stainless castor is rated from −30°C to +300°C.

Shop: Stainless Steel Castors

Outdoor bins (660 L and 1100 L)

Our pick: 150 mm cast iron for toughness, or 150 mm polyurethane for quieter rolling.

Large bins carry heavy loads over driveways, kerbs and rough paths. The City of Fremantle's waste guidelines give a maximum load of 265 kg for a 660 L bin and 440 kg for an 1100 L bin. Cast iron handles that weight and rough ground with ease, but it's loud. If the bins are wheeled out early in the morning near homes or businesses, urethane is much quieter.

Shop: Waste Bin Castors

Other outdoor jobs: for trolleys used on grass, gravel or uneven ground, go large. Big solid rubber or pneumatic (air-filled) wheels roll over bumps that stop small wheels. WorkSafe Victoria gives pneumatic tyres as an example of castor material suited to the floor surface. See our Heavy Duty Castors.

Why the right wheel matters for workplace safety

In a workplace, the wrong wheel isn't just annoying. Every extra kilogram of push force adds strain on backs and shoulders, and pushing and pulling trolleys is a recognised cause of musculoskeletal injuries.

WorkSafe Victoria's guide to choosing and using trolleys makes the link directly:

  • The minimum requirements for trolleys include "castors and wheels suited to the floor surface" and regular inspection and maintenance.
  • On floor surfaces, it recommends choosing trolleys with "castor material suited to the floor surface" and "castor diameter suited to the floor surface".
  • For outdoor work, such as moving goods to and from vehicles, it recommends castors and wheels designed for outdoor use.
  • On starting force, it notes that flat spots on a wheel, debris and floor irregularities all add to the effort needed to get a trolley moving.
  • For hand trolleys, it suggests keeping starting forces below 17–21 kg-f and the rolling force at or below 12 kg-f when trolleys are pushed more than 3 metres.

The right wheel material is one of the cheapest ways to bring those forces down. It's worth pairing with Safe Work Australia's Model Code of Practice: Hazardous manual tasks, which sets out how to identify and manage pushing and pulling risks.

Quick maintenance checklist:

  • Check wheels for flat spots, cracks and chunks missing from the tread
  • Clear hair, string, lint and swarf from around axles
  • Make sure swivels turn freely and brakes lock
  • Tighten loose mounting bolts
  • Replace damaged castors straight away, and take the trolley out of service until it's fixed

Frequently asked questions

What is the best all-round castor wheel material?

Polyurethane. It's quiet, non-marking, rolls easily and carries heavy loads, so it suits most indoor floors and most trolleys. If you're not sure, start with PU.

Which castor wheels won't mark my floor?

Grey rubber and polyurethane are non-marking. Black rubber can leave marks on light floors, and nylon and cast iron can scuff or scratch softer surfaces such as timber and vinyl.

Which castor wheels are the quietest?

Rubber is the quietest, followed by polyurethane. Nylon and cast iron are noticeably louder, especially on tiles and rough concrete.

What castor wheels are best on carpet?

Hard wheels, such as nylon, roll best on carpet because they don't sink into the pile. Soft rubber wheels take more effort to push on carpet.

What's the difference between polyurethane and nylon castors?

Nylon is harder, so it rolls slightly more easily on smooth floors and resists water and chemicals well, but it's noisier and harder on floors. Polyurethane is softer, quieter and kinder to floors, with a little more grip.

Are rubber castors suitable for heavy loads?

Standard rubber suits light to medium loads. Under heavy loads it becomes hard to push and can develop flat spots. For heavy loads, choose polyurethane or PU on a cast iron centre, or a large solid rubber wheel for outdoor use.

Can castors be used in wet areas or cool rooms?

Yes. Choose nylon or polyurethane wheels on a stainless steel frame, which won't rust from water, condensation or regular washdowns.

Still not sure which wheel you need?

Wheel material is one part of choosing a castor. Load capacity, wheel size, swivel and brake layout, and the mounting type matter too. Our guide to choosing the right castors walks through every step.

Or just ask us. Tell us what you're moving, how heavy it is and what floor it rolls on, and we'll recommend the right castor.

Free shipping on all castor sets and orders over $50 (no PO boxes). Shop all castors

Sources and further reading

This guide is general information. Always check a product's load rating and specifications, and see our Legal Disclaimer.


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