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How to Maintain Bottom Bracket Bearings

The following information was derived from the Chris King Company instruction manuals

Service of bottom bracket
The exercise bike bottom bracket can be serviced by two different methods. When rotating the inner bearing race, if resistance or drag is detected but the bearing is feels smooth, a relubrication is due. If the bearing feels gritty, contaminated, or if significant resistance is detected, then it is necessary to fully clean and relubricate the bearing. All bottom bracket bearing service can be performed with the bottom bracket mounted to the bicycle frame. The indoor cycle bottom bracket bearing can be easily flushed with new grease using a Grease Injection Tool. This service should be performed periodically. Remove crank set assembly and spindle from bottom bracket according to crank set manufacturer’s instruction. Pull out exercise bike bottom bracket bearing spindle sleeve from bearing inner race using a Bearing Spindle Sleeve Removal Tool. Simply insert the Removal Tool into the bottom bracket bearing. Pull the tool back out, and the bottom bracket bearing spindle sleeve will be attached to the tool. If Removal Tool is not available, first try removing bottom bracket bearing spindle sleeve by hand. If this does not work, carefully insert the tip of a small screwdriver or penknife under outer flange of bottom bracket bearing spindle sleeve and gently pry it out of the bearing using alternating prying locations.
Insert Grease Injection Tool into exercise bike bearing
Attach grease gun tip to grease fitting on Grease Injection Tool
While continuously pressing Grease Injection Tool into bearing to form seal, inject fitting with waterproof synthetic grease until all contaminated grease is purged from bearing
Wipe purged grease from exercise bike bearing surface
Reinstall bicycle bearing spindle sleeve by pressing the sleeve back into bearing’s inner race by hand

Bearing Cleaning and Relubrication
Remove exercise bike crank set assembly and spindle from bottom bracket according to crank set manufacturer’s instruction.
Pull out indoor cycle bottom bracket bearing spindle sleeve from bearing inner race using a Bearing Spindle Sleeve Removal Tool. Simply insert the Removal Tool into the bottom bracket bearing. Pull the tool back out, and the bottom bracket bearing spindle sleeve will be attached to the tool. If Removal Tool is not available, first try removing bottom bracket bearing spindle sleeve by hand. If this does not work, carefully insert the tip of a small screwdriver or penknife under outer flange of bottom bracket bearing spindle sleeve and gently pry it out of the bearing using alternating prying locations.
Carefully, using a small screwdriver, pick, or penknife, remove the indoor cycle snap ring by inserting tool into split of snap ring. Gently work one end of the snap ring toward bearing center until it is out of its groove. Follow the ring around with the tool until the snap ring is completely dislodged.
Lift and remove exposed exercise bike bottom bracketer seal to access the interior of the bearing.
Thoroughly flush the bicycle bearing with a light spray lubricant (e.g., WD-40™) and blow dry with compressed air.
Some solvents, synthetic lubricants, and greases with high-pressure additives may attack and damage seals and other nonmetallic materials.
Minimize exposure to these substances and thoroughly dry bearing assembly after cleaning.
Lay a bead of waterproof synthetic grease around the top of the bearing. Rotate the inner race to work grease throughout the ball area.
Wipe dirt and other contaminants from the indoor cycle seals and snap rings. Used snap rings and seals can be reinstalled unless warped, punctured, or otherwise damaged.
Replace rubottom bracketer seal between inner and outer bearing race.
Insert one edge of snap ring into groove of outer bearing race. Press along entire groove until snap ring is fully seated; a small gap should be visible between both ends of the snap ring.
Turn inner race of indoor cycle bearing by hand to test for binding. If bottom bracket do not run smooth, repeat steps 3-9. Binding is often a result of improperly seated seals and/or snap rings.
Reinstall bearing spindle sleeve by pressing the sleeve back into the bearing’s inner race by hand.
Reinstall indoor cycle crank set according to crank set manufacturer’s instructions.

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