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bociloy 4 mm 16-Ball Bicycle Bearing Retainers, 4-Pack

$4.59 (Price correct as of 11/11/2026 04:32 PST · Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product.)

This bociloy set contains four bicycle ball bearing retainers, each with 16 balls listed at 4 mm in diameter. Each retainer measures 37 mm across the outside and 29 mm across the inside. The listing names bicycle hubs and crank bottom brackets as repair applications, but fit depends on the exact bearing assembly. Compare the dimensions, ball count, and cage arrangement with the part being replaced.

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SKU: B0FS24DJKL Category:

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Quick Summary

This bociloy set contains four bicycle ball bearing retainers, each listed with 16 balls measuring 4 mm in diameter. The listing names bicycle hubs and crank bottom brackets as repair applications. Check the retainer dimensions and bearing arrangement against the part being replaced before choosing this set.

Key Details

Detail Product information and buyer relevance
Part type Bicycle ball bearing retainers for the listed hub and crank bottom bracket applications.
Quantity 4 retainers; check whether this quantity suits the repair.
Ball configuration 16 balls per retainer, each listed as 4 mm in diameter.
Retainer dimensions 37 mm outer diameter and 29 mm inner diameter. Compare both measurements with the existing part.

What to Compare Before Buying

  • Retainer size: Compare the 37 mm outer diameter and 29 mm inner diameter with the part being replaced.
  • Bearing layout: Check that the existing retainer uses 16 balls of 4 mm diameter and has a compatible cage arrangement.
  • Repair location: The listing names hubs and crank bottom brackets. Confirm that the specific component uses this retainer style and size.

Compatibility, Size and Fit

The listing describes these retainers for mountain, road, hybrid, and children’s bicycles, but those broad categories do not establish fit for a specific bicycle or component. Compare the dimensions, ball count, and cage arrangement with the bearing assembly being serviced. A similar-looking retainer may differ in size or construction.

What Is Included

The stated package quantity is four retainers. No additional repair parts or tools are specified.

Before You Decide

Check the existing retainer’s dimensions, 16-ball layout, and cage arrangement, and confirm that the specific component uses this type of retainer.

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