ProTek RC 5x10x4mm Ceramic Metal Shielded “Speed” Bearing (2)

This is a pack of two ceramic 5x10x4mm metal shielded “Speed” 1/8 clutch bearings. ProTek R/C “Speed” bearings are high performance ceramic bearings designed for the R/C racing enthusiast.
These 5x10x4mm metal shielded bearings are the standard bearing for the 1/8th scale nitro clutches. Please check the manual that came with your vehicle for the correct size if you are not certain.
These are also used as wheel bearings in the Kyosho Lazer ZX-5 1/10th scale 4WD electric buggy.

Why Ceramic?
Our ProTek Ceramic Bearings are a hybrid type, featuring Chrome Steel inner and outer races, with Si3N4 silicone nitride ceramic balls. Ceramic bearings have many advantages over standard steel bearings, such as decreased weight, higher RPM capabilities, increased corrosion and wear resistance,  as well as reduced friction and vibration.  
So next time you purchase bearings, when you ask yourself “Why should I buy Ceramic?” You should be asking yourself “Why shouldn’t I?”
Advantages of Ceramic:

• High Speed:Hybrid bearings can reach a resistance level of 1,200,000dN with grease lubrication, due to reduced slip, wear extent and heat productivity.
• Lightweight:The weight of ceramics is 60% lighter than steel, which decreases the centrifugal force and the overall bearing weight.
• Long Service Life:The service life of hybrid bearings is 3 to 5 times longer than that of steel bearings in comparable working conditions.
• Self Lubricating:Even when poorly lubricated or with no lubrication, ceramic bearings will continue to function longer than steel bearings under the same level of stress due to their self lubricating properties.
• Corrosion Resistance:Hybrid bearings have excellent corrosion resistance, and will continue to function while corroded.
• High Rigidity:The elastic ration of ceramics is 1.5 times greater than that of bearing steel, this dramatically increases the rigidity of the bearing.
• Low Friction:Ceramic materials have a low friction force. Even under the conditions of boundary lubrication, the surfaces are extremely smooth, so its friction force is low and the rotational friction moment is low.
• Wear Resistant:The micro-hardness of ceramics can reach a Vickers Hardness level of HV1700 kg/mm2, which dramatically increases the wear-resistance.

Note: It is important with ceramic bearings to ensure that the bearings are properly shimmed (do not shim them too tight), and that you keep them lubricated to ensure long life. Ceramic bearings run smoother with less friction than regular bearings, and should last three to four times as long. We highly recommend the use of Tri-Flow teflon based bicycle lubricant for ceramic bearings. Teflon lubricant works the best as the Teflon will impregnate the balls for longer life.

ProTek R/C is an AMain Sports & Hobbies brand.

This product was added to our catalog on October 24, 2006

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Phillip Atondo Verified Owner Wednesday, Aug 27 2014 (about 11 years ago) ProTek RC 5x10x4mm Ceramic Metal Shielded “Speed” Bearing (2) I’ve been running these clutch bearings for some time now and knowing that they won’t fail in a long 45 minute main is what I need! I highly recommend these bearings to anyone! 2 customers found this review helpful. Andrew Brown Verified Owner Sunday, Nov 14 2021 (about 3 years ago) ProTek RC 5x10x4mm Ceramic Metal Shielded “Speed” Bearing (2) Trying this out in my 14T Reds clutch bell for my TLR truggy paired with a Reds 721 SV and Reds tetra 34mm clutch. I don’t know if it is the extra porting by Mario Rossi or the bearings but I am screaming down the track. Will update after a few more weeks of running around my track. Matt Verified Owner Saturday, Apr 11 2009 (about 16 years ago) ProTek RC 5x10x4mm Ceramic Metal Shielded “Speed” Bearing (2) I have to agree that these bearings are awesome. I have almost a gallon of fuel on my current set and they still seem to be running great. I am running them on an X2 with a trinity .24 extech with the reckward clutch. I bought 3 sets of these and still on the first set. I will run these till they fall apart just to see how long they will last. I am very impressed though. Anonymous Verified Owner Wednesday, Mar 19 2008 (about 17 years ago) ProTek RC 5x10x4mm Ceramic Metal Shielded “Speed” Bearing (2) just as good as acer and boca bearings except the higher price they normally sell for. For ten bucks these bearings are all that and then some. Highly recommended. 0 of 1 customers found this review helpful. View all reviews