How To Replace Rear Wheel Bearings On A Bmx

Rear wheel bearing is one of the most important key parts of BMX bikes, constant concern of bicycle design and manufacturing personnel.

Facing of the design requirements and the changes in environmental conditions, the rear wheel bearing must be kept high reliability.

Bad bearing will cause noise, have a huge impact on the operation of MBX biking, the last direct impact on competition results.

How to replace the rear wheel bearing is a very important course.

The article describes how to replace the rear wheel bearings in a MBX.

Disassembly

Step 1: Remove the Rear Cog

Remove the rear cog from the wheel (the wheel will need to be off the bike).

For cog removal, insert a proper-size freewheel removal tool through the center of the cog.

Holding the cog in place with the chain portion of a chain whip, use an adjustable wrench to turn the removal tool counterclockwise. This will free the cog.

Step 2: Prepare the Work Area

Place the wheel over a light-colored towel or rag to catch any small parts that might fall during the following procedures.

Step 3: Loosen the Locknut and Cone

Place a 15mm cone wrench onto the left-side, or non-drive-side, axle cone of the wheel and turn the accompanying locknut counterclockwise with a proper-size wrench.

The locknut will be located practically at the tip of the axle. The cone will be directly beside Deep Groove Ball Bearings.

Step 4: Remove the Axle

Unthread the loosened locknut and cone, and slide the axle from the other end of the wheel.

Step 5: Remove the Bearings

Remove the bearings (which will be exposed by the removal of the axle) from both sides of the wheel.

Be sure and count how many bearing balls you remove from each side. The exact same number must go back in.

Step 6: Clean the Axle

Clean the axle of old grease and grime on Needle Roller Bearings. An old shop towel will work fine.

Replacement

Step 1: Grease the Bearing Race

Apply a layer of grease inside each bearing race. This is the "shelf" just inside the hub on which the bearings sit.

Step 2: Insert the New Bearings

Insert your bearings into each bearing race. Your new bearings will need to be the same size (and number) as your old bearings.

Step 3: Apply More Grease

Cover the new Stainless Steel Bearings with a second layer of grease. Apply further grease to the axle, coating it generously.

Step 4: Reinstall the Axle

Slide the axle back through the right side (the drive side) of the wheel. Do this carefully so you don't disrupt the bearings.

Step 5: Reassemble the Cone and Locknut

Thread the left side cone and locknut (in this order) back onto the end of the axle. Use only your fingers for this process.

Step 6: Tighten the Locknut

Place the cone wrench onto the cone and your other wrench onto the locknut. Turn the locknut clockwise against the cone to tighten.

Step 7: Check the Adjustment

The wheel should spin freely, without binding.

If the wheel binds, loosen the locknut. If there is side-to-side play in the hub, continue tightening the locknut.

Step 8: Refit the Cog

Fit your cog back onto the freewheel.

Tighten the cog in place by first inserting the freewheel removal tool once again into the center of the cog, then turning the free-hub tool clockwise with the adjustable wrench.

Safety Warning

Regardless of the front wheel, or damage to the rear wheel bearing balls, will result in a significant security risk, life-threatening, are important relative to their own lives, to learn how to replace the rear wheel bearings also become compulsory for motocross riders.