How To Measure Bicycle Crank Bearings?

Bikes are still popular with people for a variety of reasons such as that cycling is considered as part of a healthy lifestyle and also for commuting to work. Bike owners at some stage will have to do maintenance or repairs on their bikes. There is a question of how to measure bicycle crank bearings?

Measuring the crank bearings is fairly straightforward and can be measured using calipers. Simply, flip the bike over and spread the jaws on your calipers out, and slide them around the openings on each side of the shell. Then slide the caliper’s movable jaw so they are flush against the 2 openings of the bearings shell. The difference between the 2 caliper jaws is the measurement.

In this post, we will go through how to measure bicycle crank bearings you can go biking with confidence. Let’s get started!

Read more on common questions asked

What Is A Bearing On A Bike?

A bearing is a part that helps objects where there is motion or rotation. And it helps with reducing friction between moving parts. As well as providing support bearing also allow for smoother movement and rotation.



How To Measure Bicycle Crank Bearings?

The crank bearings play an important function on a bike. You should use a vernier caliper to measure the bearings, this is due to the bearings sizes been down to the decimal place. If you don’t have a caliper you can use a standard ruler.

Before going to the trouble of measuring the crank bearings, you need to do a quick inspection.

  • Check to see if your crank bearings look dry and crusty. Rusty and dry crank bearings will make a bike pull feel rough and also heavy.
  • You can try to remove the flywheel cover, then push it in an up and down motion. If there is a vertical movement in the crank bearing, then that is a sign that you should immediately replace it.
  • Try pedaling your bicycle. If the bike runs smoothly without annoying noise, then there is no problem with the crank bearings. However, if the bicycle feels heavy and makes a rough and loud sound, it is a sign that the crank bearing is no longer suitable for use.
  • There are cracks or dents in the crank bearing, usually, this happens after the bicycle has had a serious accident.

Given that the crank bearing is an important component of a bicycle, it’s a good idea to replace it immediately if you know some of the signs above and the bike starts to feel uncomfortable to use.

Even so, choosing a crank bearing cannot be done carelessly. Here are some tips for measuring the right crank bearing for your bike.

  • To get the right size, you should use a vernier caliper. The correct size of the crank bearing for a bicycle can be determined by measuring it using a vernier caliper which can determine the exact size to the decimal point. If you do not have a vernier scale, you can still use a regular ruler but with the right size.
  • You need to match the crank bearing to your bike type. Each type of bikes such as a mountain bike or BMX has a different type of crank bearing. Be aware that several types of crank bearings for bicycles are similar to one another, so it’s a good idea to ask the seller about the right type of crank bearing for your type of bike.

For the sake of comfort and to make the bike durable, you should never underestimate the function of this crank bearing.

Wrapping Up

Finally, measuring the crank bearings is fairly straightforward and can be measured using calipers. Simply, flip the bike over and spread the jaws on your calipers out, and slide them around the openings on each side of the shell.

Then slide the caliper’s movable jaw so they are flush against the 2 openings of the bearings shell. The difference between the 2 caliper jaws is the measurement.

And that’s it for now! I’d love it if this post on how to measure bicycle crank bearings was helpful to you. Let me know if you have any questions and let me know if there is more to add.

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Measure Bicycle Crank Bearings

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