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Cero maintenance and technology:



Over the past decade, sealed cartridge bearings have been widely used in bicycle hubs, replacing the more traditional slide bearing system, whilst slide bearings are very durable, and also provide superb protection they do still need regular maintenance by professional mechanics. 

From a maintenance point of view, the sealed cartridge bearing is a simpler and more functional design compared to the traditional slide bearing, they are relatively easy to fit to an axle and also remove/ replace when required. 

Our Cero wheels are fitted with high-quality TPI sealed cartridge bearings from the factory. We select a bearing we feel strikes a fair balalnce between durability and speed, if you require one more than the other please let a staff member know and we may advise on a suitable alternative before shipping your wheels. 

Bearing shell:

Their wear is from the two aspects: First, the bearing described above wear; In addition, the ratchet will also lead to a soft alloy shell groove. There is not a rubber bearing seal thst is 100% airtight / watertight. Its two rotating surfaces will suffer friction. Moisture will enter the hub. If you want to store the wheels, be sure to keep the parts dry, regardless of the length of time. If careless, even those "surgical grade" stainless steel bearings will be eroded, especially high salt road water. So, keep the drums clean and supplemented with a small amount of grease (or lubricants), they will be able to work perfectly, until the compact cartridge bearing wears out.

. Several notes:

• You can over service the wheels. If you remove the drums frequently and open the cleaning, it may cause the bearing and the shaft contact point wear; and the risk of missing pawls and springs is also higher. The spring-loaded pawls require special attention. In addition, please avoid the use of degreasing agents, and do not over-injection of GT-85 and other liquids, they will shorten the bearing life.

• Even the most tightly sealed bearings need to be replaced. Like chains, ratchet and brake lines, bearings need to be replaced several times within the life of the wheel.



Cero AR24 hub dissasembly instructions


Remove the Endcaps using 2x 5mm Allen keys

Once endcaps are removed the axel can be tapped out using a soft rubber mallet, once one bearing is out of the hub, the axel may be placed back into hub body to tap out the remaining cartridge bearing. 

Axel and bearing illustration 

The Rear hub requires 2 x 5mm Allen keys to remove endcaps, once one endcap is removed you will require a 10mm allen key to hold in the centre of the axel to undo the remaining endcap. Once both endcaps are removed the free hub body can be removed from the axel.

If you require a bearing change, use c-clip pliers to remove the non-drive side bearing cover to expose the sealed cartridge bearing as pictured below.

Flip the hub over and you will see the top hat freehub spacer in the drive side, remove this to expose the drive side sealed cartridge bearing 

Once the non-drive side bearing seal and drive side top hat spacer is removed you can tap out the bearings from either side of the hub. When one bearing has been removed place the axel back into the hub and tap out the last bearing.