The 5x13x4 Avid Clutch Bearing is designed to withstand
all of the torture you throw at them. We decided to stop trying to find a
happy medium of a single bearing to cover both clutches and wheels.
Clutch temperatures easily reach three (3) times more than that of a
wheel bearing. In order to make this bearing more suitable for high
temps and insane loads, several things had to be adjusted. First, the
balls are 20% larger than our standard $1 bearing. Second, the depth of
the grooves is much deeper so that there is a massive increase in the
surface area for the larger balls. Third, the grooves are polished more
than our standard bearing for a smoother surface which ensures the balls
have the least amount of friction when experiencing those high loads.
Lastly, the metal ribbon cage is replaced with nylon like our Aura and
Engine Bearings which are 9-time IFMAR World Champions. This removes the
metal to metal drag during high heat expansion.
No matter the brand of clutch bearing you are using, in 2003 we
discovered that you need to blow out the grease with an air compressor
before the initial use. This knowledge has not seemed to have
transferred from racing generations, so we urge you to share this
information with anyone experiencing clutch bearing issues. Simply use
an air compressor to blow the sides of each bearing for five (5) seconds
and wipe the grease with a towel that comes out of the other side. The
reason why this is done is that the clutch gets VERY hot. The heat ends
up melting the grease and flinging it onto your clutch bell causing the
shoes to slip and exponentially raising the temperature within the
clutch. Within minutes, your bearings will have melted off all of the
lubricants. The temperature, being twice what it should be, causes the
metal to expand, the bearing to bind, and ultimately, fail.
- Specifically designed for use in clutches to withstand the high heat and loads.
- Balls are 20% larger than our standard bearing line and when
combined with the deeper grooves in the races, you get a ton more
surface area to distribute the load.
- Grooves are made from 52100 and polished to a higher level of smoothness to keep friction down when at higher loads.
- Cages are made from nylon instead of steel so that during high heat
expansion situations there is no chance of metal to metal rubbing which
results in less drag, and better strength.