ACER Racing's 1/4" ceramic balls (6.350 mm ceramic balls) are made from pure silicon nitride. They measure 1/4" or 6.35mm in diameter and are from our Ceramic Nitride Pro Series material. Price is for one ball.

These 1/4" silicon nitride balls will also fit most front hubs and some bicycle headsets. Specifically they will fit Campagnolo rear hubs and bottom brackets, Shimano rear hubs and bottom brackets, Shimano headsets models M735-M736-M650-M651. The majority of rear hubs will require nine of our 1/4" silicon nitride balls on each side and bottom brackets will use eleven of our 1/4" silicon nitride balls.

Our 1/4" silicon nitride balls for bicycles have gained significant recognition in the cycling industry due to their exceptional performance and durability. These balls, made from advanced silicon nitride ceramic material, offer unique advantages over traditional steel balls, making them a preferred choice for high-performance bicycle applications and anywhere a strong, hard and lightweight ball is required.

The 1/4" size designation refers to the diameter of the silicon nitride balls, which measures approximately 6.35 millimeters. This size is specifically tailored to meet the requirements of bicycle components such as hubs, bottom brackets, and headset bearings.

One of the key benefits of using 1/4" silicon nitride ceramic balls in bicycles is their reduced weight compared to steel balls. The lightweight nature of the silicon nitride material helps to reduce the overall weight of the bicycle, contributing to improved speed, maneuverability, and responsiveness. This weight reduction is particularly advantageous in competitive cycling, where every gram matters.

Moreover, the silicon nitride balls offer exceptional hardness and superior wear resistance. This ensures prolonged service life and reduced maintenance requirements, making them an excellent choice for demanding cycling conditions. The durability of these balls allows cyclists to ride with confidence, knowing that their components can withstand the rigors of off-road trails, rough terrains, and high-speed descents.

Additionally, the silicon nitride material exhibits excellent corrosion resistance. This is particularly beneficial for cyclists who ride in wet or humid environments, as the balls can withstand exposure to moisture without compromising their performance. The corrosion resistance ensures smooth rotation, reduces the risk of rust formation, and extends the lifespan of the bicycle components.

Furthermore, our silicon nitride balls have a very low coefficient of friction, resulting in reduced energy loss and improved efficiency. This translates to enhanced power transfer, allowing cyclists to pedal more efficiently and effectively. The reduced friction also contributes to smoother operation, reduced wear on surrounding components, and a more enjoyable riding experience.

ACER Racing's 1/4" silicon nitride balls for bicycles offer exceptional performance, durability, and weight reduction advantages. Their advanced ceramic construction, reduced weight, wear resistance, corrosion resistance, and low friction make them a preferred choice for cyclists looking to enhance their performance and reliability. Whether used in road bikes, mountain bikes, or other cycling disciplines, these balls continue to prove their worth by delivering optimal performance and reliability on the road or trail.

14x25.8x6mm Ceramic Engine Bearing

$59.99 $19.99 Save $40.00

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Welcome to ACER Racing's new line of Ceramic Ball Bearings made for competition use in high performance RC car engines. These are from our Ceramic Nitride Pro Series line of world champion bearings.
These 14x25.8x6mm ceramic bearings feature our diamond polished Silicon Nitride ceramic balls plus a super high speed PEEK inner cage to withstand the heat and stress of your engine. Proprietary internal tolerances have been incorporated into this ceramic bearing as well. Price is for one ball bearing.

New generation PEEK polymer was chosen for the cages because of its superior combination of strength and flexibility, high operating temperatures, and high chemical and wear resistance. The design of the cage and material used are of paramount importance for the performance of the cage as well as for the operational reliability of the bearing itself.

Bearing cages are mechanically stressed by friction, strain and inertia. They may also be subjected to the chemical action of certain lubricants, lubricant additives or products of their ageing or organic solvents. The relative importance of these considerations can be affected by other operational parameters such as elevated temperatures, shock loads, vibrations or combinations of these and other conditions. The materials from which the bearing components are made determine to a large extent the performance and reliability of the rolling bearings. This why ACER Racing has used PEEK cages for our ceramic engine bearings.

PEEK cages have an excellent combination of strength and elasticity. The good sliding properties of the polymer on lubricated steel surfaces and the smoothness of the cage surfaces in contact with the rolling elements produce the lowest amount of friction so that heat generation and wear in the bearing are at a minimum. The low density of the material means that the inertia of the cage is small contributing to greater speed. The excellent running properties of polymer cages under lubricant starvation conditions permit continued operation of the bearing for some time without risk of seizure and secondary damage.

Our PEEK bearing cages show no signs of aging by temperature and oil additives up to +200C (392F).

Price is for one ceramic engine bearing.

UPDATE: ACER Racer Shasa Lackner received his trophy as "Swiss Junior Champion" in October using ACER Racing ceramic engine bearings in his Max Power engine. Shasa won the main final by nearly 2 laps, and set a new lap record of 14.0 seconds and his ACER Racing ceramic engine bearings worked perfectly for the entire weekend.