33" Flat Back Wheel Sets (HO Scale) - Bachmann 42904
This subscription is temporarily unavailable. Please contact us before ordering.SKU: BAC42904

Bachmann HO 33" Flat Back Metal Wheel Sets 12-Pack – 42904

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Bachmann 42904 is a 12-pack of HO scale 33-inch flat-back metal wheel sets for freight-car and rolling-stock maintenance or upgrades. The wheel sets use needle-point bearings, blackened metal wheels, and RP25 wheel contours that meet NMRA...

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Recorded scale
HO
Part number
BAC42904

Compatibility check: Confirm scale, gauge, track family, rail code, power type, DCC status, minimum radius, coupler and required components. Matching scale or brand alone does not prove compatibility.

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Product details

Bachmann 42904 is a 12-pack of HO scale 33-inch flat-back metal wheel sets for freight-car and rolling-stock maintenance or upgrades. The wheel sets use needle-point bearings, blackened metal wheels, and RP25 wheel contours that meet NMRA standards.

  • Manufacturer: Bachmann
  • Item: 42904
  • Heartland SKU: BAC42904
  • UPC: 022899429045
  • Scale: HO 1:87
  • Wheel size: 33 in. prototype
  • Pack: 12 wheel sets
  • Bearings: Needle-point
  • Wheel finish: Blackened metal
  • Contour: RP25 / NMRA
  • Shipping weight: 0.5 lb

Specifications are listed alongside the product details above.

Condition & collecting

Match the listed scale and track gauge to your layout. For locomotives, check the power system, decoder and sound details; DCC ready does not mean a decoder is installed. For rolling stock, check couplers, clearance and the manufacturer's minimum-radius requirement where provided.

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Useful next steps

These are category-level pathways, not a claim that every part fits every casting.

Start with a prepared casting

DIY kits provide a cleaner starting point, but the specific wheel pairing still needs its own fit check.

Fitment is evidence-gated

A shared diameter is only a starting clue. It is not exact-fit proof.

Learn before final assembly

Use demonstrations as practical guidance—not as proof that a different casting or component will fit.