For a dirt-bike engine, choose crankshaft main bearings or a crankshaft bearing-and-seal kit that matches the exact make, model, and year. The Hot Rods K073 kit is best for listed Honda CRF 250R and 250X models; the DCR bearings are best for specified Yamaha 450 models; and the PW80 kit is for Yamaha PW80 and BW80 applications. The other two listings below are wheel or bicycle crank bearings, not dirt-bike engine crankshaft bearings, so they are included as fitment comparisons—not substitutes.
| Product | Best suited for | Important distinction |
|---|---|---|
| Hot Rods K073 Kit | Listed Honda CRF models | Main bearings and seals |
| PW80 Bearing and Seal Kit | Yamaha PW80 and BW80 | Two bearings and two seals |
| DCR Main Bearings | Specified Yamaha 450 models | Two main bearings |
| YOXUFA 6201RS Bearings | Listed mini-bike wheels | Wheel bearings, not crankshaft bearings |
| VANSIHO Ball Bearings | Some bicycle crank applications | Bicycle parts, not engine bearings |
Hot Rods K073 Honda Main Bearing Kit
Best for: Riders servicing a listed 2006–2016 Honda CRF 250R or 250X. The kit includes main bearings and seals to accommodate crankshaft installation, and the listing says it can be used with Hot Rods or OEM crankshafts.
This is the most directly relevant option for the Honda applications named in its fitment. The listing says it meets OEM specifications, but buyers should still confirm the exact model year and engine configuration before ordering.
Limitation: Some models do not require seals, according to the product details. Check the service requirements for the specific motorcycle rather than assuming every included component is needed.
PW80 And BW80 Bearing And Seal Kit
Best for: Owners of the listed Yamaha PW80 Y-Zinger or Big Wheel BW80 years who need both bearings and seals. The package contents are identified as two bearings and two seals, and the listing provides replacement part numbers for fitment comparison.
Choose this kit if your motorcycle matches the stated PW80 or BW80 application and the listed replacement numbers align with the parts being replaced. Comparing the model year and part numbers helps distinguish it from a generic bearing set.
Limitation: Its fitment is specific to the named Yamaha models. The listing does not establish compatibility with other dirt bikes, so do not select it based on bearing appearance alone.
DCR Yamaha 450 Main Bearings
Best for: Owners of a listed 2003–2020 Yamaha WR450F or the specified Yamaha YFZ450 years. The product includes two main bearings, making it a direct option to compare when replacing crankshaft main bearings on those applications.
The stated fitment also names 2004–2009 and 2012–2013 YFZ450 models. The listing therefore covers both dirt bikes and an ATV; confirm that the year and model match before purchasing.
Limitation: The listed contents are two main bearings, not a bearing-and-seal kit. If your repair requires seals or other components, check the parts list for those separately.
YOXUFA 6201RS Mini-Bike Wheel Bearings
Best for: Replacing front or rear wheel bearings on the mini-bike models named in the listing, including selected Coleman, Baja, Motovox, and Mega Moto applications. The listed 6201RS bearings have a 12 mm inner diameter, chrome-steel construction, and rubber seals intended to keep dirt, mud, and water out.
This product is included because mini-bike owners may search broadly for bike bearings. Its sealed design and stated wheel fitments relate to wheel service, not crankshaft service.
Limitation: Do not use this listing as evidence of engine crankshaft fitment. Confirm the required wheel-bearing size and model application before ordering.
VANSIHO Bicycle Crank Ball Bearings
Best for: Bicycle owners seeking ball-bearing retainers for listed BMX, beach cruiser, or stretch bicycle crank applications. The package is described as four pieces, and the listing refers to ball sizes and different ball counts.
This is a bicycle crank component, not a motorcycle engine crankshaft main bearing. It may be relevant to bicycle maintenance but should not be chosen for a dirt-bike engine.
Limitation: The feature description mentions both 1/4-inch and 5/16-inch sizing. Verify the required size and retainer configuration for the bicycle before buying.
Buying Guide: How To Choose Dirt-Bike Crankshaft Bearings
Does the bearing fit the exact model and year?
Start with the motorcycle’s make, model, year, and engine. Crankshaft bearings are not interchangeable simply because they look similar. Match the listing’s stated fitment and, when available, compare replacement part numbers with the parts information for your engine.
Do you need bearings only or a complete kit?
A bearing-only listing, such as the DCR set, identifies two main bearings. A bearing-and-seal kit, such as the Hot Rods or PW80 option, includes seals as well. Check the repair plan and service information to determine which components are needed. Some models may not use the seals included in a kit.
Is it an engine bearing or a wheel bearing?
Check the intended location before comparing products. Crankshaft main bearings support the engine crankshaft; wheel bearings serve the wheel hub. Bicycle crank ball bearings are another distinct part category. A matching-looking bearing is not proof of correct engine fitment.
What should you verify before ordering?
- Confirm the complete model and year, not just the brand.
- Compare listed part numbers with the parts required for the repair.
- Check whether the package includes seals or only bearings.
- Confirm bearing dimensions and application when the listing provides them.
- For a kit, verify that its contents suit the specific engine configuration.
Frequently Asked Questions
Are crankshaft bearings and wheel bearings interchangeable?
No. They serve different locations and functions. Choose a product specifically identified for the engine crankshaft or the wheel being serviced.
Can I use a Hot Rods K073 kit on any Honda CRF?
No. The listing specifies Honda CRF 250R and 250X applications within stated model years. Confirm the exact year and model before ordering.
Does the DCR Yamaha set include seals?
The listed contents are two main bearings. The product details do not identify seals as included.
Is the PW80 kit suitable for other Yamaha dirt bikes?
The listing names Yamaha PW80 Y-Zinger and BW80 applications. It does not establish fitment for other Yamaha models.
Can a 6201RS mini-bike wheel bearing replace an engine main bearing?
Not based on the listing. It is described as a front and rear wheel bearing for specific mini bikes, not a crankshaft bearing.