Bottom bracket removal and installation

A conventional crankset is comprised of a left crankarm, right crankarm, and bottom bracket. With the Bontrager Road crankset, the right crank arm and bottom bracket are inseparable.

To remove a standard bottom bracket

1.Loosen the crankarm bolt on the left crankarm and remove the left crankarm.

2.Loosen the crankarm bolt on the right crankarm and remove the right crankarm.

3.Using the proper tool, loosen and remove the left ("adjustable") bottom bracket cup.

The left cup is right-hand threaded, and the right cup is left-hand (reverse) threaded.

3.Using the proper tool, loosen and remove the right ("fixed") bottom bracket cup.

To install a Giga-Pipe bottom bracket

Make sure the frame's bottom bracket shell threads are clean and in good condition. If necessary, chase and face the threads.

Grease all threaded surfaces, the bearing surfaces of the crank bolt, the interfaces between the bearings and axle, the axle splines, and also the bearing side of the seals.

1.Install the right bottom bracket cup, and tighten to 300-360 lb•in (34-41Nm).

2.Install the left bottom bracket cup, and tighten to 300-360 lb•in (34-41Nm).

3.Pass the bottom bracket axle through the right cup to the left cup.

4.Attach the left crankarm and tighten the crank bolt to 360-415 lb•in (41-47 Nm)

5.Check the left crankarm for play.

If there is play, remove both crankarms, grease the contact between the bottom bracket axle and the bearings, and reinstall. It may require installing the cranks several times to eliminate all play.

Bontrager Warranty

Trek Bicycle Corporation warrants each new Bontrager component against defects in workmanship and materials for the a period of one year from the date of sale.

This warranty does not cover-

•Normal wear and tear

•Improper assembly

•Improper follow-up maintenance

•Installation of parts or accessories not originally intended for, or compatible with, the wheels as sold

•Damage or failure due to accident, misuse, abuse, or neglect

•Labor charges for part replacement or changeover

This warranty is void in its entirety by any modification of the component or its parts.

This warranty is expressly limited to the repair or replacement of a defective item and is the sole remedy of the warranty. This warranty extends from the date of purchase, applies only to the original owner, and is not transferable. Trek is not responsible for incidental or consequential damages. Some states do not allow the exclusion of incidental or consequential damages, so the above exclusion may not apply to you.

Claims under this warranty must be made through an authorized dealer. Proof of purchase is required.

This warranty gives the consumer specific legal rights, and those rights may vary from place to place. This warranty does not affect the statutory rights of

the consumer.

253427 specifications

The Bontrager 253427 is a high-performance bicycle component designed specifically to enhance the riding experience for cyclists who demand both speed and durability. Renowned for its balance of lightweight construction and robust design, this component has garnered attention among cycling enthusiasts and professionals alike.

One of the standout features of the Bontrager 253427 is its exceptional weight-to-strength ratio. Engineered using premium materials, this component is designed to minimize unnecessary weight without compromising durability. This focus on lightweight design allows riders to accelerate more quickly and maintain higher speeds over longer distances.

The Bontrager 253427 incorporates advanced technologies that set it apart in the market. One notable innovation is its aerodynamic profile. The component has been tested in wind tunnels to ensure that it cuts through air efficiently, reducing drag and improving overall performance. This is especially beneficial for competitive cyclists looking to gain an edge over their rivals.

In addition to its aerodynamic advantages, the Bontrager 253427 features robust construction that can withstand rigorous use. The materials used in its production are chosen for their resistance to wear and tear, ensuring a long lifespan even under the most challenging riding conditions. This durability translates to less frequent replacements, making it a cost-effective choice for serious cyclists.

Another important characteristic of the Bontrager 253427 is its compatibility with a variety of bike models. This versatility makes it a popular choice among riders who own multiple bikes or who frequently change their setups. The component’s easy installation process further enhances its appeal, allowing cyclists to upgrade their gear quickly and efficiently.

The Bontrager 253427 also emphasizes comfort. Its design incorporates features that reduce vibrations and shocks, leading to a smoother ride. This attention to rider comfort is crucial for long-distance cyclists who need to minimize fatigue.

In summary, the Bontrager 253427 is a well-engineered bicycle component that combines lightweight design, aerodynamic efficiency, durability, compatibility, and rider comfort. Whether for competitive racing or casual riding, it represents a reliable choice for cyclists seeking to enhance their performance and enjoyment on the bike.