Racewill Trailer Hub Bearing Kit 4-Set for D42 Spindles - 25580 & 14125A, seals & caps

If you need to replace worn bearings on a tandem-axle boat trailer, this Racewill kit supplies all the parts for four hubs so you can service both sides at once. The kits include inner and outer bearings and races, grease seals, dust caps, spindle nuts and small hardware — everything needed for a full hub rebuild. All components are made from alloy steel and designed for trailer-duty loads and marine-adjacent environments.

What components are included in each 4-set package?

Each package contains the complete hardware to rebuild four wheel hubs: inner and outer bearings and races for each hub, grease seals, dust caps, spindle nuts and the small parts that are easy to lose during maintenance. This makes the kit a one-stop replacement for worn or damaged wheel-end parts.

• 4x inner bearings 25580 (I.D. 1.75")
• 4x inner races 25520
• 4x outer bearings 14125A (I.D. 1.25")
• 4x outer races 25520
• 8x grease seals 22333TB
• 4x cotter pins, 4x dust caps, 4x rubber plugs
• 4x spindle nuts, 4x washers

Will these bearings fit my trailer and spindle?

The Racewill kit is specified for tandem axles rated roughly 5200–7000 lb and is made to fit D42-style spindles with the stated inner and outer bearing dimensions. Check your spindle identification and bearing numbers before ordering; the inner and outer bearing ID sizes given let you confirm compatibility quickly.

• Designed for 1.25" to 1.75" bearing ID configurations used on D42 spindles
• Intended for tandem-axle trailers in the 5200–7000 lb range
• Verify current bearing numbers (25580 / 14125A) to ensure match

How do these parts make installation and maintenance easier?

Racewill supplies the small but essential accessories you need during a hub service, so you’re less likely to stop mid-job to source missing parts. The kit includes extra dust caps and rubber plugs plus shims, washers and spindle nuts to help you assemble and adjust each hub properly.

• Extra dust caps and rubber plugs reduce the chance of lost components
• Shims and washers provided for correct endplay adjustment
• Double-lip grease seals minimize leakage and retain lubrication

Are these bearings durable enough for boat trailers and seasonal use?

Components are machined from resilient alloy steel and the seals use a double-lip design to help keep grease in and contaminants out, improving service life in wet and salty conditions when properly maintained. As with any trailer wheel bearing, regular inspection, cleaning and greasing prolongs lifespan and keeps towing safe.

• Precision-manufactured alloy-steel bearings and races
• Double-lip grease seals for improved leak resistance
• Designed for the repeated loads of trailer towing and launch ramps

Who is this for: This Racewill 4-set bearing kit is aimed at boat owners, DIY mechanics and trailer shops that need a full hub rebuild package for tandem-axle trailers with D42 spindles. It suits anyone who prefers to replace all wheel-end components at once to ensure balanced performance and to avoid multiple service trips. Confirm your spindle/bearing numbers before purchase and follow proper installation and lubrication procedures for safe towing.