Pro series hubs

Important information before you begin with Pro series hubs

Some Bontrager hubs utilize DT Swiss internal parts. This manual is intended for retailers with the appropriate skills and knowledge to work on these hubs. Please read the entire section before carrying out any kind of mainte- nance work.

This manual details the principle design features of DT Swiss hubs and also provides instructions as to main- tenance and repair work. Please take special care to use only original DT Swiss special tools in order to undertake the work details in this manual. Use only DT Swiss replacement parts.

In this manual, the hubs are shown installed in a

complete wheel. Maintenance work should be carried out on complete wheels where possible. Otherwise, some steps can not be carried out correctly.

This manual provides technical and spare parts infor- mation for these hubs. If you have further questions about these hubs regarding technical information, sup- port, or warranty, they should be directed to Bontrager Technical Support via phone or on the Bontrager web site at www.bontrager.com.

In the event of improper servicing of the hubs, Bontrager has the right to refuse any warranty.

letting water into the bearings. Do

 

not use any kind of solvents or

 

tensides- this can damage the hub.

 

Determining the year of hub

 

There are two styles of rear

 

hub, with some unique parts and

 

different instructions for assem-

 

bly and disassembly. To deter-

 

mine which hub type you will be

 

Fig. FH5

working on, it is necessary to

 

remove the freehub. With the star

 

ratchet removed, you will be able

 

to see the right side shell bear-

 

ing. If the bearing is completely

 

visible due to its 24mm outer

 

diameter (Fig. FH5), it’s a year

 

2000 hub. The 2001 model uses

 

a larger, 28mm diameter bearing

 

(Fig. FH6) that is partially cov-

 

ered by the ring nut (requiring

 

Fig. FH6

the removal of the ring nut).

 

Removing the cassette from the

 

freehub body

 

Special information before you begin

Bearing play: A small amount of play between the free- hub body and the hub shell is automatically eliminated when the wheel is installed and the quick release is tightened.

Bearing resistance: New or newly re-built hubs have a higher rolling resistance than used hubs because the grease in the freehub has not yet been evenly distributed and the seals have not yet bedded in.

Aluminum freehub bodies: For hubs with an alumi- num freehub body, we recommend cassettes using a solid, one piece spider like the Shimano Dura-Ace, Ultegra, XTR, or Deore XT. Cassettes using loose or bolted sprockets like Shimano Deore LX can cause notches in the freehub body. This can cause difficulties when later removing the cassettes from the freehub body (see “Removing Cassettes” on this page).

Check your work: Before use, always check the rear hub for proper functioning. Check the freehub body and the ratchet mechanism. If they do not function correctly, the rear hub should not be used until the fault is cor- rected. If you are unable to correct the fault, consult Bontrager Technical Support.

The cassette does not need

to be removed from the freehub body to perform regular main- tenance. However, if you decide to remove it, it should only be removed after the hub has been completely re-assembled.

1.Release the lockring using a lockring tool.

2.Loosen the cassette by lightly tapping it counter-clockwise with the hammer.

3.Remove all the sprockets from

the freehub body.

4. Use a fine file to remove

bad notches from the aluminum free- hub body (Fig. 14H). The aluminum freehub body must be cleaned and inspected. If any cracks or other damage is visible, the components must be replaced.

Note: Notches on the freehub body do not have a negative influence on the functionality of the freewheel.

Fig. FH7

Freehub seal installation tool

Short bearing press

Long bearing press

Regular Maintenance

Maintenance of the rear and front hubs should be performed at least once a year. This maintenance schedule is based on normal usage. If you ride your bike more than average, or in rain, snow, or off road conditions, service your bicycle more often than the schedule sug- gests. If any part appears to be malfunctioning, inspect and service it immediately.

Things to avoid

Avoid high pressure washing systems, like those at most car washes. The high pressure can bypass bearing seals,

Required tools

Maintenance of Pro level hubs requires special tools, available as TCG part #211415:

Freehub seal installation tool Long bearing press

Short bearing press Special screwdriver

DT Swiss special freehub grease DT Swiss multi-purpose grease Spline tool

Special screw- driver

Spline tool

2003 Bontrager Service Manual

25

 

Page 23 Page 25
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Image 24
Bontrager 231793 Important information before you begin with Pro series hubs, Determining the year of hub
Page 23 Page 25

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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