TPR Caster Wheels vs Rubber and PU: What the Evidence Settles for Light-to-Medium Duty

Check the per-wheel load before anything else

Load is the first disqualifier, because TPR sits below PU in load capacity and the published capacity bands do not overlap much.

TPR is a hybrid rubber/plastic tread with lower load capacity than PU 11 , and one supplier's capacity table puts rubber around 200 kg per caster, PU at 200–900 kg and nylon at 400–1200 kg 28 .

The only specific TPR rating in this evidence set is a 3-inch conductive TPR wheel, 60 mm wide, thread-stem mounted, rated 80 kg 9 — consistent with a light-to-medium duty position rather than a heavy-load one. For loads over 500 lbs per wheel, PU is the recommended material and rubber disqualifies 6 .

That leaves a wide band between the 80 kg example and the 500 lbs (about 227 kg) PU threshold where no source states a TPR rating.

If your calculated per-wheel load lands in that band, the evidence cannot tell you whether TPR is adequate — ask the supplier for a rated capacity at your exact diameter and width, and for the basis of that rating.

Load per caster is normally calculated from equipment weight plus payload, divided by the number of support wheels, with a safety factor for the operating environment 35 ; the safety factor itself changes with guidance type and obstacle height, from 1.2 indoors with manual guidance to 2.0 outdoors with motorised guidance 35 .

Match the tread hardness to the floor

TPR runs softer than PU and roughly in the same band as standard rubber, which is what makes it a floor-protection candidate. Published hardness ranges put TPR at Shore A 60–80, PU at Shore A 70–95 and standard rubber at Shore A 40–60 11 .

A softer tread spreads the point load over a larger contact patch, which is the mechanism behind reduced marking and noise on tile, hardwood and LVP 11 .

TPR is named as the softer option where PU is limited — on ultra-smooth surfaces such as polished tile, a softer TPR wheel may be needed for grip 22 — and as the recommended choice alongside soft PU for hardwood, and alongside rubber for tile where chipping and noise matter 24 .

Both TPR and PU are described as non-marking and quiet, so floor protection alone rarely separates them; PU is called the most versatile floor-protection material across hardwood, vinyl, epoxy, tile and concrete 22 .

The practical split is therefore floor finish plus load: TPR where the floor is the constraint and the load is light, PU where the load is heavier and the floor is still protected.

Note that one source rates TPR only 'Fair' for floor protection while others call it excellent — see the conflict table below before you treat the floor-protection claim as settled.

Check the chemical and temperature envelope

TPR's chemical story is its strongest differentiator for janitorial and hospitality work. TPR is reported resistant to water, chemicals and cleaning solutions, which is why it is a popular choice for janitorial applications 27 .

Standard rubber, by contrast, is cited as degrading under certain chemicals and extreme temperatures, and PU as not holding up in extreme temperatures 26 8 . On temperature, one AGV comparison table lists TPR at -35 to 80 °C, PU at -20 to 80 °C and hard rubber at -20 to 80 °C 35 .

That table is a single source and does not distinguish continuous from intermittent exposure, so treat the range as a starting point rather than a limit.

If your application involves steam cleaning, freezer rooms, hot washdown or specific solvents, put the exact chemical and the actual surface temperature to the supplier and ask for a material recommendation and any test data behind it.

Weigh flat-spot resistance and wear life

Flat-spotting is where TPR's hybrid composition earns its place. TPR is described as highly unlikely to flat-spot, and where it does occur the cause is given as wheels sitting beyond their maximum carrying capacity in the same spot for a year 27 .

The elastic, rubber-like component disperses energy as the wheel rolls, which is the stated reason for the smooth ride 27 . Rubber is the opposite case: it is cited as the material most likely to flat-spot, and even a harder rubber wheel will flat-spot if left loaded long enough 27 .

Rubber wheels develop flat spots under heavy static loads exceeding 50% of rated capacity, per the compression-set behaviour documented in ASTM D395 3 . Wear life is less clear.

PU is cited as lasting 3 to 5 times longer than rubber 3 , but no source in this set gives an equivalent service-life figure for TPR under a defined duty cycle.

One comparison table rates TPR 'Excellent' for shock and wear resistance but only 'Fair' for floor protection, and marks it light-duty only for AGV use 35 .

If your carts sit loaded for long periods, TPR's flat-spot resistance is the reason to prefer it over rubber; if they roll continuously under load, the missing TPR wear data is the reason to ask the supplier for abrasion or life test results before committing.

Compare the cost position, then supply your own replacement frequency

TPR is described as typically mid-range in cost compared to other caster wheel materials 27 . That is the only cost statement the sources make about TPR, and it is a relative position, not a figure.

No source in this set publishes a cost per wheel or a total-cost-of-ownership comparison for TPR against rubber or PU.

The TCO argument that does exist is between PU and rubber: PU's longer lifespan is argued to pay back its higher upfront price inside year 2 when wheels are replaced more than once a year at scale 6 . That argument turns on replacement frequency, which only you can supply from your own maintenance records.

If your fleet replaces wheels less than once a year, the payback case weakens and TPR's mid-range price becomes the more relevant number; if it replaces them more often, the PU case strengthens.

Either way, ask the supplier for a per-wheel price at your diameter and width, and for the replacement interval they expect under your duty cycle, so the comparison rests on your numbers rather than on a general claim.

What to put in the RFQ

The published sources establish almost nothing about TPR's commercial and compliance profile, so these checks close the gaps the evidence leaves open.

The only concrete TPR product detail in this set is a 3-inch conductive wheel, 60 mm wide, thread-stem mounted, rated 80 kg 9 — useful as a reference point, not as a size range.

• ✓Ask for the rated load capacity at your exact wheel diameter and width, and whether it is a static or dynamic rating.
• ✓Ask which mounting types are available for TPR wheels — the only example here is thread-stem.
• ✓Ask for the standard size range and the lead time for your quantity.
• ✓Ask for the operating temperature range and whether it is continuous or intermittent.
• ✓Ask for chemical resistance data against the specific cleaning agents or solvents in your facility.
• ✓Ask for abrasion or service-life test data under a defined duty cycle.
• ✓Ask for FDA, EU 10/2011, REACH or RoHS documentation if the application touches food or regulated markets.

Where the sources disagree on TPR

The floor-protection claim is the one place the sources contradict each other, and it is central to the TPR decision. Treat it as unverified until your own floor test settles it.

What the sources do not establish

• No dynamic and static load ratings for TPR, rubber and PU at matched wheel diameter and width.
• No push-pull force or rolling resistance measurements for TPR vs rubber vs PU at rated load.
• No quantified noise (dB) or floor marking test data for TPR on concrete, tile, wood or epoxy.
• No continuous vs intermittent temperature limits for TPR, and no specific chemical resistance data.
• No abrasion resistance or service life data for TPR under a defined duty cycle.
• No cost per wheel or total cost of ownership figures for TPR vs rubber vs PU.
• No TPR-specific standard size range, mounting type availability or lead times beyond the single 3-inch thread-stem example.
• No FDA, EU 10/2011, REACH or RoHS certification information for TPR, rubber or PU wheels.