Tag Archives: cearmic bearings

How often should I service my bearings?

At Kogel Bearings we get a lot questions about the service interval of our bearings. The official answer is  that you should service your bearings once per year. It is not difficult to see that this is a very generic, almost randomly chosen time period. It does not take the mileage, weather conditions, bicycle type or overall maintenance of the bicycle into consideration.

In order to give a more detailed answer to the questions about bearing service, let’s have a look at what causes the need for service.

Bearing Contamination

This one is very obvious: just like mud on your chain, water and sand make an excellent paste to grind the internal parts of your precious bearings to pieces. In our production facilities we spend an unbelievable amount of time to polish the balls and races that are used for our bearings. After that, we consider the process to be finished. You are probably not going to improve the polish quality during your ride.

When your bearings are contaminated, you can easily feel this by removing the cranks or wheel axle, sticking your finger inside the bearing and spinning it. Smooth spinning is good, the slightest hint of gritty feeling is due to stuff inside your bearing that should not be there.

The picture of the left is a generic bottom bracket after three muddy  rides. The PF30-24 on the right is boxfresh and ready for action.
This is what our competitors bearings looked like after three muddy rides. Some TLC is due. The PF30-24 on the right is boxfresh and ready for action.

Being not much of a scientist and a lot of a common sense guy myself, being honest with yourself brings a lot of answers. Did your last mountain bike adventures involve river crossings? Have you been out riding in the rain? Did you take your bike to the carwash and not tell anyone about this horrible offense? In all cases it is good to give your bearings (and complete bike while you’re at it) a quick check.

Bearing Lubrication

Our high quality hybrid ceramic bearings require very little lubrication. During production we usually fill them a bit more than necessary, since we feel that your bearings should be for everyday use and not a race day or velodrome only product. While the road bearings feel very smooth rolling out of the box, they usually feel better after a couple hundred miles. This is due to the grease being pushed to the sides of the bearings, leaving only a thin film on the raceways and balls.

Nothing looks better than some freshly cleaned and repacked bearings

Since the bearings are made to run with minimal amounts of our Secret Grease Mix, I consider it not so much of a factor for the service interval. A light swishy swishy sound (as opposed to scraping and grinding sound to stay fully scientific) coming from your bottom bracket while spinning the crank is not necessarily a bad thing. Most of our bearings sound like that after break in.

The 1 year interval is probably a good indication here, unless you are lucky enough to find time to ride over 10.000 miles per year of course. Remember common sense!

Have a look at this video, which was shot while preparing some sample bearings for the UnitedHealthcare team time trial camp. These bearings are running completely dry. The riders were given bearings that had only a drop of oil with the intention to give them a top level performance that lasts for about 50 miles.

kogel bearings spin test

dry running bearings spin faster than anything, but it can cause heat build up and affects durability

Wear and tear of the bearing seals

The bearing seals are one of the few parts on your bike where a non-moving part is pressed against a moving part. By definition this causes friction and friction causes wear. Compare it to skidding your rear tire on the road or trail.

Bearing seals wear out over time, changing the quality from ‘fully sealed’ to ‘fully unprotected’. They are also cheap and easy to install. For anyone that has ever tried to remove a bearing seal without damaging it, you know it’s a gamble. I have tried it once or twice myself and consider it a 50/50 chance of success. Let us take the frustration out of it for you, it really feels good to be able to yank those seals out without caring if you bend or break them. It will save you some time too. Do this with every bearing service and you will live a happier life, promise!

Conclusion

In conclusion to all the above: Officially we recommend to service Kogel Bearings once per year, but this does not mean you can ignore these hard workers that sit at the center of every rotating part of your  bicyle. Keep an eye out for contamination, at least minimal lubrication and replace those seals with every service.

 

In a next blog post we will show a step by step of how to perform a bearing service.

What is the cost of a ceramic bearing upgrade for bicycles? Part 1

Ceramic bearing upgrades come in all shapes and sizes. First there are the different parts of the bike that can be upgraded, then there is a plethora of brands and non-branded products to choose from.

There are three main parts of the bicycle where ceramic bearings can bring benefits over steel bearings: the wheels, bottom bracket and derailleur pulleys.

The cost of a ceramic Bottom Bracket

The bottom bracket is a central part of the bicycle. It is similar to the transmission in a car in a way that it handles all the power transfer between the engine and wheels. Where a car transmission only handles forces along the central axis, a bottom bracket deals with oscillating movements and side loads due to the pedaling. There can be some lateral load due to wave washers or crank bolts that are tightened too much. Our bottom bracket is living a rough life down there! Needless to say that quality is key here.

A quick search on Ebay teaches us that ceramic bottom brackets are available from $35 plus shipping. From the tests we have done, these bottom brackets are hit and miss. Some are decent, some take only a few weeks before the bearings are pulverized.

A ceramic bottom bracket from the ‘exotic’ brand GUB is yours at $45 with free shipping

Enduro bearings makes two types of ceramic bearings: Zero and XD15, with the main difference being the quality of the ceramic balls and the fact that Zero are radial ball bearings and XD15 are angular contact. Their bottom brackets are priced around $200

Ceramicspeed is the gold standard by which all other bearings are measured. They sponsor many of the world’s best athletes, and like your Oakley shades, that reflects in the price. Their bottom brackets typically  cost $269, or $369 if you choose to go with the coated bearing races.

Ceramicspeed’s top offer will set you back $369

As a reference: Kogel Bearings range between $160 and $190, depending on the model.

The cost of ceramic wheel bearings

A typical bicycle wheel set runs on six bearings: two in the front hub, two in the rear hub and two in the freehub. The biggest challenge is often to find out which bearings go where. With the wheel set in hand, it is easy for a mechanic: just open the hub and note the bearing numbers, or measure the size of each bearing, which usually can be done without removing the bearings. An internet search can sometimes prevent this work, but some brands are notoriously secretive about their bearing  sizes.

For easy comparison we have determined the cost of an upgrade for two common hub types.

Ebay search results tell us a cost of $58 for a set of DTSwiss 240s and $54 for a set of 2015 zipp hubs of whichever was the cheapest we could find.

Enduro zero comes in at $224 for the DTSwiss hubs and $234 for the Zipp hubs.

Ceramicspeed leaves the shop with you for either $519 or $779, depending on your choice for coated races.

Kogel Bearings offers different bearings for road and off road use. Both retail at $260 for six bearings.

Kogel has a flat fee pricing of $260 for six bearings, regardless of wheel type.

In part two  of  this post we will look at derailleur pulleys and draw conclusions on the total cost of ownership.

***

If you have any questions about Kogel Bearings, ball bearings in general or our Ball Bearing Adventures, please ask them either in the comments section below, one of our social media channels or by email via info@kogel.cc. We will answer them in a highly professional, but not always scientific way. We do not shy away from many subjects. Please ask, we are here to answer.