Mountain Bike Hub and Frame Bearings - Precision Bicycle Bearings - Road BMX

Plaig Bicycle Bearings have been developed with Durability and Performance as the key focus. The Popularity of our bearings has seen us branch out into a larger range for Radio Control Cars, fishing reels, 3d printers, Robotics and many more purposes. The price is per bearing, all of our bearings will come with Rubber Seals except for 25x37x6mm – Chrome Steel – Rubber seal on one side, PA46 Nylon carrier.

To Purchase from us, select the bearing size, then bearing Material (Only options for the bearing size that you have chosen will be shown). 

Bearing Materials

SAE 52100 Chrome Steel Balls

• Higher hardness for longer life ratings

• Low cost for high performance

• Good for temperatures up to 150°C

• Poor corrosion resistance (if left exposed)

This is the standard steel for most ball bearings. It is harder than stainless steel and gives greater life ratings. It also has superior low noise qualities to standard 440 grade stainless steel. Chrome steel actually has a low chromium content and is not corrosion resistant, all Plaig bearings are assembled with Shell AF2 Oil as chrome bearings require an oil coating on the exterior surfaces to protect against corrosion which can contaminate the inside of the dry bearing. Chrome steel can tolerate continuous temperatures of up to 150°C. Above this temperature, bearing life is significantly reduced.

Silicon Nitride Ceramic Balls (Si3N4)

• Very good corrosion resistance to water, salt and chemicals

• Good high temperature performance up to 1,000°C

• Non magnetic and electrically insulated

• Lighter than steel balls

• Very low heat expansion, less expansion and contraction between heating and cooling.

Ceramic Bearings can run faster than all steel bearings due to the lower centrifugal force generated by the ceramic balls, the speed increase for Ceramic Bearings is 30 - 40% with adequate lubrication. Ceramic Bearings are less subjected to ball skidding under initial acceleration / torque. This allows the bearing to last longer and be far more reliable. Low heat expansion allows the bearing retainers to last longer. There are no downsides to Ceramic Bearings other than they cost more to manufacture.

PTFE Heat Resistant Rubber Seals

• Excellent corrosion resistance to water, salt water and most chemicals

• Good high temperature performance.

• Non magnetic

• Only semi-precision grade is possible

• Maximum temperature 260°C

The PTFE Seal is rubber bonded to a metal washer. The inner lip of the seal rubs against the bearing inner ring to provide an effective seal against smaller particles such as dust and moisture while preventing lubricant leakage.

Contactless Metal Shields

Metal Shields are designed to prevent larger particles from entering the bearing and also to keep grease inside the bearing. As the shields make no contact with the inner ring, they do not increase starting or running torque, but they do allow for much higher RPM's.

Bearing Retainer / Cage

Retainers keep the balls evenly spaced around the raceway preventing ball to ball contact and thus allowing higher speeds. They also help to retain grease around the balls and raceways. For greater accuracy and to prevent any additional friction, it is important that the retainer is not allowed too much radial movement.

Our Chrome Steel bearings use a Carbon Steel Crown Retainer, our Ceramic Hybrid Bearings use a Stainless Steel Retainer.

Why Buy Plaig Bearings

Plaig Bearings have been put to the test since 2008, with over 500,000 Bearings being sold across Australia. Our bearings have been tested under the harshest conditions, by the best RC Drivers, Fishermen, Engineers, Cyclists and Hobbyists.

There are many theories on what makes a good bearing, but putting it to the test in the harshest conditions possible is the only way to practically assess whether a bearing will stay in one piece or not. The best RC drivers with the best cars will not sacrifice a trip interstate or even internationally, to have a bearing failure during a critical race.

The best Fishermen do not want a Reel failure whilst reeling in that big fish. Many professionals put their trust in our Bearings. Value for money is a priority for Plaig Bearings, providing exceptional quality for reasonable prices is what we do best.

Shipping & returns

All orders are sent using Australia Post Express Post, this has been discounted to just $4.90.
Please note that if you have made an error with your address, we are not liable for the lost package or the cost to replace it.

Returns

All Returns are accepted as per eBay's Policy.
If you have purchased an item by error, it can be returned for a full refund.
All returns must be received back prior to a refund being issued.