How The Rear Hub Works On Your Dirt Bike

How Your Rear Wheel Hub Works

How The Rear Wheel Hub Works On Your Dirt BikeUnderstanding how your rear hub works will save you time and effort when you perform your routine maintenance.

Unlike the front hub, the rear has three bearings instead of just 2, and a bearing retainer that screws into the brake side of the hub.

Related: Dirt Bike Tube & Tire Change: DIY Tire Tools

There are two bearings on the sprocket side and one bearing on the brake side.  The double bearing on the sprocket side is needed to handle the torque from the engine.

Hub Components From Sprocket To Brake Disc:(Click To Enlarge)
AxleAxle
Left Axle Spacer      Axle Spacer
Left Bearing SealLeft Bearing Seal
Left Outer BearingRight Outer Bearing
Left Inner BearingLeft Inner Bearing
Distance CollarAxle Distance Collar
Right BearingRight Side Bearing
Bearing RetainerBearing Retainer
Right Bearing SealRight Bearing Seal
Right Axle SpacerRight Axle Spacer
Axle blockAxle Block
Washer And Axle NutAxle Nut


Related:
Video: How To Change The Rear Wheel Bearing Seals On Your Dirt Bike

Rear Axle

The square axle end and axle block allow the rear wheel to slide up and down the swing arm when adjusting the chain tension.

Hub Assembly In Swingarm

The rear brake assembly mounts to the axle and rides along a track in the swing arm, so it stays in place when the wheel moves during chain adjustment.

Rear Brake Carrier

Related: How To Change The Front Wheel Bearings On Your Dirt Bike

Bearings

The bearings are the only part of the hub that spin, and are the only connection between the hub and the axle.

Old And New Bearings

(These particular bearings are from factory links. They are double shielded, pre-greased, and I highly recommend them. They go for $20 on Amazon.com, and you can buy yours HERE.)

Spacers

The spacers and bearings must all be an exact length, so the swing arm is not pulled together, or pushed apart. If any component is damaged or out of spec, it needs to be replaced.


Chain Adjusters

While not part of the axle, the chain adjustment bolts are critical.

Chain Adjustment Bolts

These bolts keep the wheel aligned perpendicular to the drive chain.  If the rear wheel is out of alignment, it will cause premature wear on the drive chain, sprockets, swingarm, and bearings, all of which cost money to fix.

Related: How To Remove & Install The Front Wheel On Your Dirt Bike

Axle Nut

The axle nut must be torqued to proper specification to allow the components to work together. Too tight and you will foul the bearings, Too loose and the spacers will spin on the axle.

When the hub components are in good shape, greased up, and aligned properly, your rear hub can go years without maintenance.

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Keep Reading – Rear Wheel Bearing Change

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