The Castair W10x3x.75 is a heavy-duty replacement wheel for Castair air compressor units — 10" outer diameter, 3" wide tread, 3/4" axle bore. The wider tread and larger axle bore compared to the W10x1.5x.5 make this the wheel for larger, heavier compressor units where the extra contact surface area and heavier axle provide appropriate load capacity. At $33.88, this is the larger of the two Castair 10" wheel options — built for compressors that need it.
Who Needs This Wheel
The 3" tread width and 3/4" axle bore are for compressors at the heavier end of the portable and semi-portable range. A wider, deeper tread distributes the compressor's weight across more contact surface — reducing rolling resistance, improving stability, and handling rough or uneven floor surfaces better than a narrow tread. If your original wheels are 3" wide with a 3/4" axle, you need this wheel — the 1/2" bore W10x1.5x.5 won't fit without modification.
Key Specifications
- Outer Diameter: 10 inches
- Tread Width: 3 inches
- Axle Bore: 3/4 inch — fits 3/4" axle rod
- Application: Heavier Castair portable and semi-portable compressor units requiring 3/4" axle specification
- OEM Castair Part: Factory-specification replacement wheel for Castair compressors with this wheel dimension
W10x3x.75 vs. W10x1.5x.5 — Choosing the Right Wheel
Both wheels share the same 10" outer diameter but differ in tread width and axle bore:
- W10x1.5x.5 ($15.40) — 10" OD, 2" wide tread, 1/2" bore — smaller, lighter compressors
- W10x3x.75 ($33.88) — 10" OD, 3" wide tread, 3/4" bore — larger, heavier compressors (this part)
Critical: Measure your axle rod diameter before ordering. A 3/4" bore wheel installed on a 1/2" axle rod is loose and dangerous — the wheel will wobble laterally and can come off under load. A 1/2" bore wheel physically won't fit a 3/4" axle. Measure the axle with a caliper. If you don't have a caliper, a 3/4" drill bit should slide into the bore of the correct wheel.
Installation Notes
- Depressurize the tank and disconnect from power before any work on the compressor frame
- Note the axle retention method (roll pin, cotter pin, snap ring, or other) before removal
- Inspect the axle rod for straightness, wear, and corrosion — replace a bent or deeply corroded axle at the same time
- Lightly lubricate the axle bore before installation if the wheel uses a plain (non-sealed) bearing
- Reinstall retention hardware securely — both wheels must be properly retained before rolling the compressor
- On replacement of both wheels: set the compressor on its feet and check that it rolls straight without pulling to one side
What's in the Box
- 1x Castair W10x3x.75 Replacement Wheel — 10" OD x 3" wide x 3/4" bore
Axle retention and mounting hardware are not confirmed to be included. Check what hardware your compressor uses before ordering.
Technical Specifications
- Part Number: W10x3x.75
- Manufacturer: Cast Air / Castair
- Outer Diameter: 10 inches
- Tread Width: 3 inches
- Axle Bore: 3/4 inch
- Category: Major Components
- Price: $33.88
Load rating and tread material were not confirmed from manufacturer data at time of writing.
Why Buy From Air Compressor Factory Direct?
- Castair Parts Specialist: We stock both Castair 10" replacement wheel options and can confirm the correct bore size for your compressor model
- Free Shipping: On qualifying orders to the contiguous US
- Free Tech Support: Call 866-217-0063 before you order if you're unsure whether your axle takes 1/2" or 3/4" — it's a 30-second question
- OEM Parts: Factory-specification Castair replacement components
- Full Manufacturer Warranty: Backed by Castair's standard product warranty
Call 866-217-0063 for quick answers and help!
