FAQ: How To Size Mountain Bike Wheel Bearings?

How do I know what size bearings I need for my bike?

You can find bearings in the front or rear hub in your wheels, inside the bottom bracket where the axle is connected to the cranks and in the frame where your headset sits. All these are applicable to either mountain bikes or road bikes.

What size are MTB wheel bearings?

3.969 mm (5/32″) – steerer (fork) bearings and many pedals. 4.762 mm (3/16″) – front wheel hubs (2 times 10 balls – i.e. 10 balls at each side most often). 6.35 mm (1/4″) – rear wheel hubs (usually 2 times 9 balls) and cup and cone bottom brackets (2 times 11).

What size bearings do Shimano hubs use?

The bearings in a Shimano rear hub are ¼” in diameter and each race contains 9 bearings.

Do bearings have to match wheel size?

Regardless of wheel size, all skateboard bearings are the same size and will fit any skateboard wheel that Warehouse Skateboards sells. The universal measurements for bearings are 8mm (core), 22mm (outer diameter), and 7mm (width). Skateboard bearings are sold in sets of eight, as each wheel requires two bearings.

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How do I know if my bike bearings are bad?

The sound should remain smooth, quiet, and even but if there are bumps, gaps, or any loud noises, this is a sign that the bearing is dry or worn out. This will call for either a bike bearing overhaul or a complete replacement.

Are Sealed bearings better?

We use sealed so the bearings are protected from road debris and weather, so they spin cleaner and with less friction for longer. Sealed bearings perform as well or better than loose bearings, without the maintenance.

How do I know if my bearings are sealed?

When trying to decide whether a bearing is sealed using the AFBMA or SKF code, note the shields or seals section. If the bearing number uses the AFBMA code, look for “EE” (or “2RSI” for SKF) to determine if the bearing is sealed on both sides. This is the only way to identify whether a bearing is sealed.

How long do pedal bearings last?

They will cost more up-front but will last 5-10 times as long. Also, they will be more efficient, and make your ride (slightly) easier. Anywhere from 20 weeks to 20 years. I’ve had fairly expensive pedals go south after only a few months, while others have lasted 5-10 years.

How many ball bearings does a Shimano front hub have?

Ten 3/16″ bearings per side on the front, Nine 1/4″ bearings per side on the rear.

How do you check for loose ball bearings?

How to Measure a Bearing

  1. To measure the bore of a bearing you can use a vernier caliper like the one shown.
  2. To measure the outside diameter of a bearing place the jaws of the caliper around the bearing and close it until its a good fit but not tight, now read the value from the caliper.
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Are all bike wheel bearings the same size?

First off, there are 4 different sizes of ball bearings used for bike parts: 5/32″, 1/8″, 3/16″ and 1/4″. Oh, and some Shimano pedals even use 3/32″ size balls.

Is ABEC 7 or 9 better?

The higher the ABEC rating, the tighter the tolerances are, making the bearing a more precision part. In an application like this, an ABEC – 7 or 9 bearing rating may be appropriate. However, a skateboard with 54mm wheels turning 20,000 RPM will be traveling about 127 MPH!

Do bearing spacers slow you down?

Bearing spacers are little tubes that keep the inner race of your bearings correctly spaced and aligned on the axle. This will slow your bearings down and wear them out super fast! Skaters without bearing spacers might find it easier to just run their axle nuts a bit loose to keep the wheels spinning freely.

Are ABEC 9 bearings good?

You get a reasonable amount of speed, and at a reasonable cost. ABEC 7 bearings would be very fast and smooth, but very expensive. ABEC 9 and higher bearings would be ridiculous to use in a skateboard unless you are doing downhill luge-style skating or something else where your goal is to go insanely fast.

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