On this page
- Raw wheels vs complete casters: when to buy just the wheel
- What is a raw wheel
- When to buy raw wheels instead of complete casters
- How to measure a wheel for replacement
- Cost and lead time comparison
- Axle bore, bearing, and hub length in depth
- OEM and MRO procurement rules
- Common raw wheel procurement mistakes
- Frequently asked questions
- Related Engineering Tools & Guides
Raw wheels vs complete casters differ by load capacity, wear behavior, and floor compatibility.
- Match capacity per caster to your total load divided by 3 (one caster may be airborne)
- Polyurethane and rubber wheels favor floor protection; phenolic and steel favor heavy capacity
- Top-plate or stem mount is dictated by the equipment, not preference
- CasterHQ stocks Albion, Hamilton, P&H, Colson, Faultless, and Durastar from Mansfield, Texas
- Call 844-439-4335 for fitment help on any non-standard caster
Raw wheels vs complete casters: when to buy just the wheel
A raw wheel is the wheel alone, no rig. A complete caster is the wheel already built into a swivel or rigid rig with a top plate or stem. The right choice saves 20-60% on cost, cuts lead times, and eliminates obsolete rig inventory. This guide walks when to buy raw wheels, when to buy complete casters, how to measure axle bore and hub length for a drop-in replacement, and the procurement rules CasterHQ uses with OEM customers.
In this guide
What is a raw wheel
A raw wheel is the wheel component alone: tread material (polyurethane, rubber, phenolic, steel) molded or bonded to a core (aluminum, steel, polyolefin), with a pre-installed bearing and a specified axle bore. No rig, no top plate, no brake. It is the piece that rolls.
A complete caster includes the raw wheel plus the rig that converts the wheel into a mounted part: top plate or stem, swivel or rigid legs, kingpin or kingpinless raceway, axle, brake (optional), and any dust covers or shields.
- Raw wheel components: tread, core, bearing(s), bore.
- Complete caster components: raw wheel + rig + top plate/stem + axle + brake (optional).
- Typical raw wheel cost: $8-180 depending on size and material.
- Typical complete caster cost: $22-900+ depending on spec.
Field note: On most industrial carts, the rig outlives the wheel by 2-4 cycles. Buying raw replacement wheels instead of complete casters is the single biggest cost saver most MRO buyers miss.
When to buy raw wheels instead of complete casters
Raw wheels are the right call in roughly 60% of industrial caster replacement scenarios. The decision rule:
- Buy raw wheels when: the existing rig is sound (no bent legs, cracked welds, loose kingpin, worn raceway) and only the wheel tread or bearing is spent.
- Buy complete casters when: the rig shows any cracks, bends, loose top plate bolts, worn raceway, or is below the current OSHA or load-rating spec.
- Buy complete casters when: you cannot source a matching axle bore and hub length for the existing rig (especially on imports and obsolete OEM specs).
- Buy complete casters when: labor to disassemble and rebuild the rig exceeds the cost differential between raw and complete.
- Raw wheel decision flowchart: rig sound (yes) + bore matchable (yes) + labor reasonable (yes) = buy raw. Any no = buy complete.
| Scenario | Raw wheel | Complete caster |
|---|---|---|
| Worn tread, good rig | Yes (save 40-60%) | No |
| Failed bearing, good rig | Yes (save 40-60%) | No |
| Bent rig leg | No | Yes (safety) |
| Non-standard bore | No | Yes |
| Upgrading load rating | No | Yes |
| Obsolete OEM caster | Varies | Usually yes |
How to measure a wheel for replacement
Pull one spent wheel from the cart and capture six measurements before ordering. This is the most skipped step in raw wheel procurement and causes 80% of wrong-size returns.
- 1) Diameter: measure across the tread, edge to edge. Industrial wheels run 2, 2-1/2, 3, 3-1/2, 4, 5, 6, 8, 10, and 12 inches.
- 2) Tread width: measure the face of the tread that contacts the floor. Common widths: 1-1/4, 1-1/2, 2, 2-1/2, 3 inches.
- 3) Hub length: measure the total width of the hub from outer face to outer face. This must match the rig leg spacing exactly.
- 4) Axle bore: measure the inside diameter of the wheel hub hole, not the axle itself. Common bores: 3/8, 1/2, 5/8, 3/4 inch (plus metric equivalents on import rigs).
- 5) Bearing type: look inside the hub. Loose roller, sealed annular ball, needle, bronze bushing, or delrin.
- 6) Tread material: polyurethane (95A typical), rubber (70A soft), phenolic, Mold-On rubber, forged steel.
Hub length is the most-missed measurement. Two wheels with the same diameter, tread width, and bore can still have different hub lengths. Hub length controls whether the wheel fits between the rig legs at all. A 1/8" mismatch means the wheel rubs and the rig binds.
Cost and lead time comparison
Raw wheels save 20-60% against complete casters in most industrial scenarios. Real pricing examples from CasterHQ's shipping data, 2026:
| Part | Complete caster | Raw wheel | Savings |
|---|---|---|---|
| 5" x 1-1/4" poly, light duty | $34 | $12 | 65% |
| 6" x 2" poly-on-steel, med-heavy | $98 | $38 | 61% |
| 8" x 2" poly, heavy duty kingpinless | $185 | $72 | 61% |
| 10" x 3" forged steel, extra heavy duty | $520 | $165 | 68% |
| 12" x 4" forged steel w/ tapered roller | $870 | $295 | 66% |
- Lead time: stock raw wheels ship same-day from Mansfield, same as complete casters.
- Freight: raw wheels weigh 30-50% less than complete casters, so freight drops proportionally.
- Labor: raw wheel swap is a 5-8 minute job with a cotter pin punch and a hammer. Complete caster swap is a 10-15 minute job with a torque wrench.
- Total TCO: on carts where the rig is sound, raw wheel replacement cycle costs 35-55% less over 5 years than complete caster replacement.
Axle bore, bearing, and hub length in depth
The three measurements that make or break a raw wheel order are axle bore, bearing type, and hub length. Each has standard choices but mixing them blows the fit.
- Axle bore: 3/8 inch is medium duty standard. 1/2 inch is heavy duty medium-light. 5/8 inch is heavy duty. 3/4 inch and 1 inch are extra heavy duty and ultra heavy duty.
- Bearing and bore relationship: the bearing inner race sets the bore diameter. A 5/8 bore wheel uses a 5/8 ID bearing. You cannot sleeve down a larger bore to fit a smaller axle reliably; the wheel will wobble.
- Hub length: common hub lengths are 1-3/16, 1-3/8, 1-5/8, 1-13/16, 2, 2-1/16, 2-3/16, and 2-7/16 inches. Leg spacing on the rig must match to within 1/16 inch.
- Spacers: small hub-length mismatches (under 1/8 inch) can be corrected with precision spacers. Larger mismatches require a different wheel.
- Bearing upgrade path: a raw wheel with a better bearing is the cheapest push-force reduction in the industrial fleet. Swapping plain bushings for annular ball bearings cuts operator push-force by 30-45%.
Engineer tip: Always specify bearing and bore together when ordering raw wheels. A 6" x 2" poly wheel with 1/2" bore and annular ball is not interchangeable with a 6" x 2" poly wheel with 5/8" bore and roller bearing. Catalog numbers are not always consistent across manufacturers.
OEM and MRO procurement rules
OEM (original equipment manufacturer) and MRO (maintenance, repair, operations) buyers have different raw wheel priorities.
- OEM priorities: consistent lot supply, repeatable fit tolerance, documentation on bearing and tread material, COO (country of origin) if required for Buy American, DFAR, or Berry Amendment.
- MRO priorities: drop-in fit to existing rigs, shortest lead time, lowest per-unit cost, simple reorder via part number or SKU.
- Standard practice at CasterHQ: OEMs get lot-matched raw wheels on blanket orders with 12-month pricing; MROs get a named SKU mapped to their existing rig spec in their customer account.
- Paperwork for OEM: material certs on tread, bearing manufacturer and part number, dimensional inspection report on request.
- Compatibility matrix: for MRO fleets with mixed rig vintages, CasterHQ maintains a compatibility matrix that maps raw wheel SKUs to rig models. Ask for it.
Common raw wheel procurement mistakes
The mistakes that turn a raw wheel order into a return or a safety incident:
- Ordering by diameter alone: diameter does not fit a wheel. Diameter, tread width, hub length, bore, and bearing all fit. Order all five.
- Assuming bearing carries over: bearings wear, and the replacement wheel needs a matched fresh bearing. Do not reuse the bearing from the spent wheel.
- Mixing bores across a cart: if one wheel is 5/8 bore and another is 1/2 bore, the axles are different sizes. Do not cross-mix.
- Ignoring durometer: 95A poly and 80A poly look identical but behave very differently. 95A is rigid and load-bearing; 80A is soft and quiet. Match the catalog durometer.
- Forgetting to pull a sample: the single best raw wheel order practice is to pull one spent wheel, bag it, and photograph the hub face with a tape measure against it. Email the photo to your supplier at order entry.
Do not guess on hub length. If the existing wheel hub measures 1-3/8 inches, do not order a 1-5/8 inch hub "because it is close." The wheel will rub the rig, the cart will stall, and the return cost (freight each way) often exceeds the savings on the raw wheel itself.
Key takeaways
- Raw wheels save 40-65% over complete casters when the rig is sound.
- Always pull one spent wheel and measure six dimensions: diameter, tread width, hub length, bore, bearing type, tread material.
- Buy complete casters when the rig shows any damage, when load rating needs upgrading, or when bore cannot be matched.
- Hub length is the most-missed measurement and the most common cause of wrong-size returns.
- OEM raw wheel orders need material certs and lot control. MRO orders need drop-in SKUs and fast turns.
Frequently asked questions
What is a raw wheel?
A raw wheel is the wheel alone, no rig. It includes the tread (polyurethane, rubber, phenolic, or steel), the core (aluminum, steel, or polyolefin), and the installed bearing. No top plate, no stem, no swivel or rigid legs. It is the piece that rolls and can replace the wheel in an existing caster rig.
When should I buy raw wheels instead of complete casters?
Buy raw wheels when the existing rig is sound, no bent legs, cracked welds, loose kingpins, or worn raceways, and only the wheel tread or bearing is spent. In that scenario, raw wheels save 40-65% over complete caster replacement. Buy complete casters when the rig is damaged, when you need to upgrade load rating, or when the bore cannot be matched to the existing axle.
What six measurements do I need to order a raw wheel?
Diameter, tread width, hub length, axle bore, bearing type, and tread material. Missing any one of these causes wrong-size returns. Hub length is the most-missed measurement and causes roughly 80% of fit failures. Pull one spent wheel and measure all six before ordering.
Are raw wheels cheaper than complete casters?
Yes, typically 40-65% cheaper. A 5 inch polyurethane wheel costs about $12 raw versus $34 complete. An 8 inch heavy duty wheel costs about $72 raw versus $185 complete. Freight is also lower because raw wheels weigh 30-50% less than complete casters.
Can I put a new wheel on an old rig?
Yes, if the rig is sound. Check for bent legs, cracked welds, loose top plate bolts, and a worn raceway before reusing the rig. If any of those are present, replace the complete caster for safety. A bent rig under a new wheel is a drop hazard regardless of how new the wheel is.
What bore size does my axle need?
Measure the axle itself with calipers. Common industrial axles are 3/8 inch (medium duty), 1/2 inch (medium-heavy), 5/8 inch (heavy duty), 3/4 inch (extra heavy duty), and 1 inch (ultra heavy duty). The wheel bore must match the axle diameter exactly. Do not sleeve down a larger bore to fit a smaller axle; the wheel will wobble and fail.
Need Raw Wheels Spec'd for Your Fleet?
CasterHQ stocks raw industrial wheels from 2 inches through 12 inches in polyurethane, rubber, phenolic, Mold-On, and forged steel. Call 844-439-4335 with your hub length, bore, bearing type, and tread width and we will ship same-day from Mansfield. OEM lot-matched blanket orders and MRO named-SKU accounts supported.
References & Standards Cited
- ANSI MH29.1 Industrial Casters and Wheels.
- ASTM D2240 Durometer Standard.
- ABMA 9 / 11 Bearing Tolerance Class Standards.
- DFARS 225.7002 Buy American / Berry Amendment compliance.
- Internal CasterHQ raw wheel order data, 2015-2026, Mansfield TX.
- ANSI/ICWM Performance Standard for Casters & Wheels (Institute of Caster and Wheel Manufacturers)
- ISO 22883 — Castors and wheels: requirements for applications up to 1,1 m/s
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Shop All CastersCall 844-439-4335Jordan Wilson
Founder of CasterHQ.com. Works directly with engineers, MRO buyers, and procurement teams across material handling, healthcare, food service, aerospace, and OEM. CasterHQ stocks Albion, Hamilton, P&H, Colson, Faultless, and the in-house Durastar series from a Texas warehouse and retrofits OEM fitments from dimensional drawings when brands discontinue parts.