Front hubs- Cartridge bearing, alloy axle

2002/2003 Bontrager Race, Race Disc front wheels

Fig. 1C

End caps

Fig. 2C

Fig. 3C

Axle nut

Fig. 4C

Recommended tools

17mm cone wrench Special hook spanner Hammer and broad punch Bearing removal tool Bearing press

DISASSEMBLY

Hub parts and names are referenced on next page.

Remove the axle

1.Remove axle end caps (Fig. 2C) by sliding them out of the axle with your fingers.

2.Hold the axle with a 17mm cone wrench (Fig. 3C) while loosening the axle nut with the special hook spanner (Fig. 4C).

3.Partially unthread the axle nut (Fig. 5C) until it slightly protrudes past the end of the axle.

4.Tap the axle nut with a soft-faced hammer until the axle slides through the opposite bear- ing. Once loose, the axle should come out with your fingers.

5.Remove the axle nut, and extract the axle (Fig. 6C).

6.Gently insert a thin screw- driver blade between the bearing seal (Fig. 7C) and bearing. Pry off the bearing seals from both sides of the hub.

7.Insert a bearing removal tool into the bearing. Place a blunt punch through the hub and against the bearing removal tool. Tap the punch with the hammer to drive the bearing out of the hub (Fig. 8C). Repeat for the other bearing.

ASSEMBLY

1.Press a bearing into the hub with a bearing press.

Note: the black seal faces out (Fig. 9C).

2.Press the second bearing with the bearing press.

3.Place the bearing seals

into the hub with the lettered surface facing out.

6.Insert the axle through the hub from either side.

7.Thread the axle nut onto the axle.

8.Hold the axle with a 17mm cone wrench and tighten the axle nut with the special hook span- ner until finger tight.

Do not over-tighten the axle nut. The axle should turn freely with no lateral play in the hub shell.

9.Press the axle end caps into both ends of the axle.

After completing assembly of the hub, check its function by spinning the axle with your fingers. It should rotate freely without irregular friction. A small amount of lateral play

is acceptable if the play is eliminated when the wheel is installed with the quick release properly closed.

Axle

Axle nut

Fig. 5C

Fig. 6C

Fig. 7C

Bearing seat

Fig. 8C

Clean and inspect the parts

1.Wipe old grease or debris from the hub bearing

seats.

2.Normally, bearings are not re-used. If you are re- installing an old bearing, wipe off any grease or debris from both the inner and outer surfaces.

Do not use solvent on the bearing, as the solvent will contaminate the grease. This may cause bearing failure.

Lubricate bearings and threads

1.Lubricate the threads on the axle with Wrench Force™ synthetic grease, or a similar product.

2.Lightly grease the inner and outer surfaces of each bearing.

Fig. 9C

6

2003 Bontrager Service Manual

 

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Bontrager 231793 service manual Front hubs- Cartridge bearing, alloy axle, 2002/2003 Bontrager Race, Race Disc front wheels
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231793 specifications

The Bontrager 231793 is an advanced mountain bike tire designed to enhance performance on various terrains while providing users with durability and traction. Known for its dependable construction and innovative features, the 231793 has become a popular choice among cycling enthusiasts seeking a reliable tire for their off-road adventures.

One of the key features of the Bontrager 231793 is its versatile tread pattern. The tire boasts an aggressive design that enhances grip on loose and uneven surfaces such as mud, gravel, and dirt. This tread pattern is carefully engineered to allow for quick, confident cornering while minimizing the risk of slip, making it an ideal choice for adventurous riders who tackle challenging trails.

The tire employs a robust casing that not only contributes to its durability but also enhances puncture resistance. This characteristic is essential for mountain biking enthusiasts who venture into rough terrains where sharp objects may pose a threat to tire integrity. The reinforced sidewalls provide added protection against pinch flats, ensuring a smoother, worry-free ride over rocky and harsh surfaces.

Additionally, the Bontrager 231793 is compatible with tubeless setups, which offers substantial benefits in terms of performance. The tubeless design allows for lower tire pressures, improving traction and overall ride quality while reducing the risk of pinch flats. Cyclists can also enjoy a significant reduction in weight by eliminating the need for inner tubes, resulting in a more responsive handling experience.

Another notable characteristic of the 231793 tire is its weather resistance. Designed to perform reliably in various weather conditions, this tire offers excellent traction on wet surfaces without sacrificing performance in dry conditions. This versatility makes it a suitable option for riders who frequently encounter changes in weather and terrain.

In summary, the Bontrager 231793 stands out in the crowded market of mountain bike tires due to its aggressive tread pattern, durability, and tubeless compatibility. Whether tackling steep climbs, navigating technical descents, or exploring diverse trails, this tire is engineered to provide riders with the confidence and control they need for an exhilarating biking experience. Adventure seekers looking for reliability and performance in their mountain biking adventures will find the Bontrager 231793 to be an exceptional choice.
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