If you’re an avid mountain biker or just starting out, understanding the different types of disc brake mounts is crucial. One common conversion that many riders undertake is converting a post mount fork to an IS mount. This allows for more versatility when it comes to choosing brake calipers and is a popular choice among riders.
Converting a post mount fork to an IS mount might seem daunting at first, but with a few simple steps, you’ll be able to make the switch in no time. First, you’ll need to gather the necessary tools, including an IS mount adapter and the appropriate hardware.
Once you have all the tools ready, you can start the conversion process. It’s important to note that this conversion may vary depending on the specific fork and frame you have, so it’s always a good idea to consult the manufacturer’s instructions or seek professional help if needed. However, here are the general steps to follow:
Understanding post mount and IS mount
When it comes to mounting a fork on a bike frame, there are two commonly used methods: post mount and IS mount. These methods determine how the brake caliper is mounted on the fork and affect the overall performance and compatibility of the bike.
Post mount
Post mount is a widely used method for mounting disc brake calipers on a fork. In this system, the brake caliper attaches to the fork using two bolts that go through the post mounts on the fork. The post mounts are small tabs or brackets welded or brazed onto the fork legs, providing a secure attachment point for the caliper.
One of the advantages of the post mount system is its simplicity and ease of use. The post mount design allows for easy installation and adjustment of the caliper, making it a popular choice for many bike manufacturers. Additionally, the post mount system is generally lighter and provides a cleaner overall look to the bike frame.
However, one limitation of the post mount system is its compatibility with different rotor sizes. Post mount forks typically come with a specific rotor size limitation, and if you want to use a larger rotor, you may need to use an adapter to fit it properly.
IS mount
IS mount, short for International Standard mount, is another commonly used system for mounting disc brake calipers. In this system, the brake caliper attaches to the fork using two bolts that go through the IS mounts on the fork. The IS mounts are threaded holes located on the inside of the fork legs.
The IS mount system provides more versatility in terms of rotor size compatibility. Unlike the post mount system, IS mount forks can accommodate different rotor sizes without the need for additional adapters. This makes IS mount a popular choice for riders who frequently change their rotor sizes for different riding conditions.
However, it’s worth mentioning that the IS mount system requires threadings inside the fork legs, which adds additional weight to the fork. Additionally, the installation and adjustment of calipers can be slightly more complicated compared to the post mount system.
In conclusion, both post mount and IS mount systems have their advantages and limitations. Understanding the differences between the two can help you choose the right fork for your bike, depending on your riding preferences and needs.
Advantages of converting to IS mount
Converting a post mount fork to IS mount can offer several advantages for riders. The IS mount, also known as International Standard mount, has become the industry standard for disc brake mounting on bicycles. Here are some of the advantages of converting to IS mount:
Compatibility
One of the biggest advantages of converting to IS mount is the increased compatibility with disc brakes. Many modern disc brakes are designed to be directly mounted onto an IS mount, so converting your fork to IS mount allows you to use a wider range of available brakes. This opens up more options for upgrading your braking system or replacing worn-out components.
Stability
The IS mount system provides a more stable and secure connection between the brake caliper and the fork. The two-bolt design of the IS mount ensures that the brake caliper stays firmly in place and minimizes any potential movement or vibration during braking. This enhances overall braking performance and improves rider confidence, particularly in demanding or technical trail conditions.
Easy Installation
Converting a post mount fork to IS mount is a relatively simple process that can be done by most bike mechanics or experienced riders with basic tools. The IS mount adapters are widely available and come in various sizes to fit different fork and brake combinations. The installation usually involves removing the post mount adapter, attaching the IS mount adapter, and adjusting the brake caliper position. This allows for a quick and hassle-free conversion.
| Advantages | Summary |
|---|---|
| Compatibility | Increased compatibility with disc brakes, wider range of available brakes |
| Stability | More stable and secure connection, enhanced braking performance |
| Easy Installation | Relatively simple process, quick and hassle-free conversion |
Overall, converting a post mount fork to IS mount can provide riders with greater compatibility, stability, and ease of installation. This allows for more flexibility in choosing and upgrading disc brake systems, resulting in improved braking performance and a more enjoyable riding experience.
Compatibility with modern disc brakes
One of the key factors to consider when converting a post mount fork to IS mount is the compatibility with modern disc brakes. While many older forks may not have been designed to accommodate disc brakes, newer forks typically have the necessary mounting points and clearance.
It is important to ensure that the new IS mount adapter is compatible with the specific disc brake caliper you plan to use. Different brands and models of disc brakes may have slightly different mounting standards, so it is essential to check the specifications and compatibility requirements provided by the manufacturer.
Additionally, the size of the rotor used with the disc brakes should also be considered. Most modern mountain bike forks are designed to accommodate a specific rotor size, typically 160mm or 180mm. It is important to ensure that the fork is compatible with the rotor size you plan to use and that there is adequate clearance between the rotor and the fork blades.
Lastly, it is crucial to consider the compatibility of the disc brake system with the rest of your bike’s components. This includes ensuring that your wheel hubs are compatible with the disc brake system, as well as checking that the brake levers and hydraulic lines are compatible with the chosen disc brake caliper.
Overall, ensuring compatibility with modern disc brakes is crucial when converting a post mount fork to IS mount. By carefully checking the specifications and requirements of your disc brake system, you can ensure a successful conversion that allows for optimal braking performance on your bike.
Increased stiffness and improved performance
Converting a post mount fork to IS mount offers several benefits, including increased stiffness and improved performance. Here are some key advantages of making this conversion:
| Advantage | Description |
|---|---|
| Increased stiffness | By converting to IS mount, the fork can be securely attached to the frame, resulting in greater stiffness. This enhanced rigidity helps to improve steering precision and overall bike handling. |
| Improved performance | The conversion to IS mount allows for better brake performance. The direct mounting of the caliper to the frame eliminates the need for an adapter, reducing flex and providing more efficient power transfer. This translates to better stopping power and improved control. |
| Compatibility | IS mount is a widely-used standard in the cycling industry. By converting to IS mount, you gain access to a larger selection of forks and brakes, increasing compatibility options for future upgrades or replacements. |
| Ease of installation | Converting a post mount fork to IS mount is a relatively straightforward process. With the necessary tools and proper instructions, it can be done by most bike enthusiasts or mechanics, saving you time and money. |
In conclusion, the conversion from post mount to IS mount offers increased stiffness, improved performance, greater compatibility, and easy installation. It’s a worthwhile upgrade for those looking to enhance the performance and capabilities of their bike.
Tools and materials needed for conversion
Converting a post mount fork to an IS mount requires a few specific tools and materials. Here is a list of items you will need:
1. Brake adapter kit
In order to convert a post mount fork to an IS mount, you will need a brake adapter kit. This kit includes the necessary brackets and hardware to attach the IS mount caliper to the post mount fork. Make sure to choose the appropriate adapter kit for your specific fork and caliper.
2. Hex wrench set
Having a set of hex wrenches in various sizes will be necessary for loosening and tightening bolts during the conversion process. Make sure to have wrenches that fit the size of the bolts on your specific fork and caliper.
3. Torque wrench
It is important to have a torque wrench to ensure that you tighten all bolts to the proper torque specifications. This will help prevent over-tightening or under-tightening, which could lead to brake failure or damage to the fork or caliper.
4. Loctite threadlocker
Using a threadlocker, such as Loctite, will help to keep bolts securely in place once tightened. Apply a small amount of threadlocker to the threads of each bolt before tightening to prevent loosening due to vibration.
5. Grease
Using grease on all moving parts, such as bolts and pivots, will help to reduce friction and ensure smooth operation. Apply a small amount of grease to each bolt and pivot point before installation.
By having these tools and materials on hand, you will be well-prepared to convert your post mount fork to an IS mount. Make sure to follow the manufacturer’s instructions and take your time during the conversion process to ensure a safe and successful outcome.
Post mount to IS mount adapter
Converting a post mount fork to IS mount can be done using a post mount to IS mount adapter. This adapter allows you to mount IS mount brake calipers onto a post mount fork.
Here’s how you can use a post mount to IS mount adapter:
- Start by removing the post mount brake caliper from the fork. This usually involves loosening the mounting bolts and sliding the caliper off.
- Attach the post mount to IS mount adapter to the fork. The adapter typically has two holes that align with the post mount holes on the fork.
- Secure the adapter to the fork using the appropriate bolts. Make sure the adapter is aligned properly and tightened securely.
- Once the adapter is properly attached, you can now mount the IS mount brake caliper onto the adapter. Align the mounting holes on the caliper with the holes on the adapter.
- Secure the brake caliper to the adapter using the caliper mounting bolts. Make sure they are tightened securely.
- Double-check all the bolts and connections to ensure they are properly tightened.
- Test the brakes to make sure they are functioning correctly. If you notice any issues, double-check the installation and make any necessary adjustments.
By using a post mount to IS mount adapter, you can easily convert your post mount fork to IS mount and continue using your IS mount brake calipers. This is a simple and effective solution for those who want to upgrade their braking system or replace worn-out components.
Allen Wrench Set
An allen wrench set is an essential tool for converting a post mount fork to an is mount. Allen wrenches, also known as hex keys, are used to tighten and loosen screws with hexagonal heads. They come in a variety of sizes to accommodate different screw sizes.
Types of Allen Wrenches
There are two main types of allen wrenches: L-shaped and T-handled. L-shaped allen wrenches are compact and convenient for reaching tight spaces, while T-handled allen wrenches provide more leverage and are easier to grip.
Choosing the Right Size
When converting a post mount fork to an is mount, it is important to choose the correct size allen wrench. The size of the allen wrench needed can vary depending on the specific fork and is mount adapter being used. Refer to the manufacturer’s instructions or consult a professional bike mechanic to determine the correct size.
It is also worth noting that allen wrenches are typically measured in millimeters. Common sizes for bicycle components range from 2mm to 10mm.
Using an Allen Wrench
To convert a post mount fork to an is mount, follow these steps:
- First, make sure the bike is secured in a bike repair stand or placed upside down on a soft surface.
- Using the appropriate allen wrench size, loosen the bolts on the post mount fork.
- Remove the post mount adapter from the fork.
- Attach the is mount adapter to the fork using the allen wrench.
- Tighten the bolts on the is mount adapter until they are secure.
It is important to use the correct torque when tightening the bolts. Over-tightening can damage the components, while under-tightening can lead to a loose and unsafe connection. Refer to the manufacturer’s instructions or consult a professional bike mechanic for the recommended torque specifications.
Overall, having an allen wrench set is crucial when converting a post mount fork to an is mount. With the right tools and proper technique, this conversion can be done efficiently and effectively.
Cable Cutters and Crimping Tool
When converting a post mount fork to IS mount, it is important to have the right tools for the job. One of the essential tools you will need is a cable cutter.
A cable cutter is used to cut through the housing and inner cables of the brake system. This tool is essential for trimming the cables to the proper length and ensuring a clean and precise cut.
Another important tool to have is a crimping tool. A crimping tool is used to securely fasten the cable ends to the brake levers and calipers. This tool creates a strong connection that will hold up under the pressure of braking.
When choosing a cable cutter and crimping tool, look for options that are specifically designed for bike cables. These tools will have sharp blades and a compact size that is perfect for working on a bike.
Remember to always use caution when working with cable cutters and crimping tools. Make sure to wear protective gloves to avoid any injuries and keep the tools away from children.
Having the right cable cutters and crimping tool will make the conversion process much easier and ensure a professional-looking result. Invest in these essential tools and you’ll be ready to convert your post mount fork to IS mount with ease.
