Quick Summary
This is a 4-piece bicycle crank bearing replacement set for bicycle crank, bottom bracket, and axle assembly replacement. The set uses 8mm balls with 9 balls per retainer, and the stated dimensions are 45 mm outer diameter and 32 mm inner diameter.
The product is described as stainless steel and is intended for replacing worn bike bearings. Before choosing it, check the bearing size and fit against your bike’s existing parts.
Key Details
| Detail | Product information and buyer relevance |
|---|---|
| Pack quantity | 4 pieces. Compare this with the number of bearings you need to replace. |
| Ball diameter | 8 mm (5/16 inch). Match this to your existing bearing size. |
| Balls per retainer | 9 balls per retainer. Check that the configuration matches your replacement part. |
| Outer diameter | 45 mm (1.77 inch). Confirm the outside size for fit. |
| Inner diameter | 32 mm (1.26 inch). Confirm the inside size for fit. |
| Material | Stainless steel. Material choice matters if you want to match the existing part. |
What to Compare Before Buying
- Size: Match the 45 mm outer diameter, 32 mm inner diameter, and 8 mm ball diameter to your current bearing.
- Quantity: This set includes 4 pieces, so confirm that matches the replacement job.
- Configuration: The retainers use 9 balls each, which should align with the part being replaced.
- Application: Check that your bike uses this style of crank bearing before ordering.
Compatibility, Size and Fit
This set is described for bicycle crank bearings and is also listed for bottom brackets and axle assemblies. It is also described as fitting mountain bikes, kids bikes, and low-speed models. Because bearing fit is size-specific, match the diameter figures and the retainer layout to the part already on your bike.
Before You Decide
Confirm the 4-piece quantity, the 45 mm outer diameter, the 32 mm inner diameter, and the 8 mm ball size before choosing an offer. If your bike uses a different bearing size or layout, select a matching replacement part instead.
Checking Bearing Interface
Matching the listed diameters and ball size is only part of confirming fit. Compare the retainer’s shape and seating position with the existing bearing, and confirm that the crank or bottom bracket assembly uses this bearing arrangement. Matching dimensions alone do not establish compatibility with a particular bike.
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