MAIN BEARING GRADE B 4G63 EVO5-9

General standard grade bearings will have a Tin flash plating over the entire bearing to give them the grey silver finish. Since these bearings are designed for high end race purposes, the use of the final tin flash is not required as it gives no added benefit. Therefore, these bearings may show different colouring, which is normal.

The disadvantages of using the Tin Flash Plating are 1. Heat dissapation will be reduced. 2. The tin on the bearing back can act as a lubricant at high temperatures, and reduce the friction between the bearing and its housing. 3. At high loads and temperatures the tin plating on the bearing back can break down and "pool" to create hot spots.

To ensure the optimum bearing performance, the TOMEI Competition Bearing Series has not adopted this type of final tin flash plating. Thus the appearance of uneven colouring on our bearings. This poses no issues with performance and 
bearing efficiency so please do not be alarmed by it. There is a protective oil coating administered during packaging for protection against the elements. Please remove this oil coating prior to use. The protective oil coating will allow the 
bearings to have a storage shelf life of up to 3 years.