Before the widespread use of cartridge bearings, bottom brackets were designed with loose balls or caged balls running on races inside the cups and races shaped into the spindle. Mechanical seals or o-rings were used to keep out water and dirt. Nowadays the spindle is held inside a case by means of sealed cartridge bearings pressed onto the spindle. The only seals being those on the bearings themselves. A less than ideal state of affairs for the part of the bicycle in a location that will be sprayed from time to time with a slurry of water, grease, oil, de-icer, sand and grit.

Loose ball bearings are generally utilized to maintain space contained in the moving parts of some sort of rotating object, for case a wheel or gear. They're typically found within bicycle and car tires. The best place to buy for loose ball bearings is through the Internet, in which a broad various products are made available.

Entry-level threadless headsets still use loose ball skf bearings arranged in metal cages. These cages can be bent easily, rendering them useless. Also watch for balls dropping out.

Threadless headsets and hubs that use loose ball bearings require steel bearing seats. These tracks must remain smooth and free from pits or cracks for the balls to run smoothly. 

Use a spray of degreaser to shift the worst of the grime, then get to work on the bearings with a lint-free rag. Be careful to avoid popping the individual ball bearings out of the cage — they’re difficult to replace, especially without damaging the cage. As with cartridge bearings, brighter is better with loose ball iko bearings. If they look tired, they probably ought to go.

Keep a container next to you and put your loose ball bearings straight into it as you’re removing them from your hubs. They’re easy to lose and seem to like nothing better than rolling into hard-to-reach places, particularly under the fridge.

Get a magnetised screwdriver blade to make life easier for yourself when removing loose ball bearings from a hub – the balls will stick to the magnetic tip without the need for more sticky grease. Either buy one or magnetise your own screwdriver by dragging its blade over a fridge magnet several times in the same direction.

Ball bearings are typically used to maintain space within the moving parts of a rotating object, such as a wheel or gear. They are commonly found in bicycle and car tires. The best place to shop for [loose ball bearings]  is via the Internet, where a wide variety of products are offered. 

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