Avid Disc Caliper Spacer Guide

When it comes to bicycle braking systems, particularly disc brakes, finer adjustments can often lead to significant improvements in performance and versatility. For riders looking to optimise their setup, understanding components like the Avid disc caliper spacer set is crucial. This seemingly small yet vital piece of kit offers a straightforward solution to a common dilemma: fitting different sized rotors to your existing post mount disc brake setup without the need for bulky adaptor brackets. Let's delve into what these spacers are, why you might need them, and how they integrate into your bike's braking system.

What Exactly is an Avid Disc Caliper Spacer Set?

At its core, an Avid disc caliper spacer set is a collection of precisely machined spacers designed to alter the position of your brake caliper relative to the frame or fork mount. This adjustment is primarily to accommodate different rotor sizes. Instead of relying on separate, often cumbersome adaptor brackets that bolt between the caliper and the mount, these spacer sets are designed to be integrated directly into the caliper mounting hardware. They effectively 'space out' the caliper, allowing it to align correctly with a larger rotor, thereby increasing braking leverage and power. The Avid set is particularly noteworthy as it aims to simplify this process, often eliminating the need for traditional adaptors altogether.

The Problem They Solve: Rotor Size Versatility

Bicycle manufacturers and riders alike are constantly seeking ways to enhance braking performance. A larger rotor generally provides greater stopping power and better heat dissipation, which is especially beneficial for heavier riders, demanding terrain, or long descents. However, not all frames and forks are designed with ample clearance for every rotor size. This is where Avid's solution comes into play. By using their caliper spacer set, you can often fit a larger rotor (e.g., moving from a 160mm to a 180mm rotor) directly onto a post mount setup that might not otherwise accommodate it, without requiring a specific adaptor bracket. This not only saves weight and reduces potential points of failure but also streamlines the installation and look of your brakes.

Key Features and Benefits of Avid Spacer Sets

Avid's design philosophy often focuses on user-friendliness and integrated solutions. Their disc caliper spacer sets typically boast several key features:

• Direct Integration: Designed to work directly with Avid brake calipers and mounting points, often eliminating the need for separate, bulkier adaptor brackets.
• Rotor Size Compatibility: Enables the use of different rotor sizes (e.g., fitting a larger rotor than originally intended for the frame/fork mount) by repositioning the caliper.
• Includes Proper Hardware: Crucially, these kits come with the necessary mounting bolts. This is essential as the caliper mounting bolts will need to be longer to accommodate the added thickness of the spacers. Avid specifies these for both their CPS (Constant Progression System) and Standard style brakes, ensuring broad compatibility within their product lines.
• Stainless Steel Bolts: The inclusion of stainless steel caliper mounting bolts is a testament to Avid's commitment to durability and corrosion resistance, ensuring your brakes remain reliable in various weather conditions.
• Simplified Setup: By providing all necessary components, the installation process is made more straightforward, appealing to both home mechanics and professional bike shops.

Understanding CPS vs. Standard Mounting

Avid has historically used two primary mounting systems for their disc brake calipers: CPS and Standard. Understanding the difference is key to selecting and installing the correct spacers and hardware.

CPS (Constant Progression System)

The CPS system is a unique Avid design that uses a special washer system. This system allows for a small degree of angular adjustment of the caliper during installation. The 'floating' nature of the CPS washer allows the caliper to self-centre on the rotor, which can make initial setup and alignment easier and potentially lead to quieter braking by minimising rotor rub. The spacers designed for CPS systems will incorporate the necessary provisions to work with these specific washers.

Standard Mounting

This refers to the more conventional method of mounting brake calipers, where the caliper bolts directly to the mount, and alignment is achieved by carefully positioning the caliper by eye or with a feeler gauge before tightening. The Avid spacer sets also include hardware for these standard mounts, ensuring that riders with older or different Avid brake models can also benefit from the rotor size flexibility.

When Would You Need an Avid Disc Caliper Spacer Set?

There are several scenarios where this type of spacer set proves invaluable:

1. Upgrading Rotor Size: The most common reason is to upgrade to a larger rotor for increased stopping power or better heat management. For example, if your frame and fork are designed for 160mm rotors but you want to fit 180mm rotors, you'll need to move the caliper outwards.
2. Replacing a Damaged Caliper Mount: In rare cases, a caliper mount on a frame or fork might be slightly damaged or out of alignment. Spacers can sometimes help to compensate for minor imperfections, though significant damage usually requires professional repair or replacement of the frame/fork.
3. Frame/Fork Compatibility Issues: Some frames or forks might have tight tolerances or specific clearances that make fitting certain adaptor brackets difficult or impossible. A well-designed spacer set can offer a cleaner, more integrated solution.
4. Standardisation: If you're building a bike or upgrading components, you might want to standardise on a particular rotor size across multiple bikes. This kit can help achieve that without needing a different adaptor for every setup.

Installation Guide: A Step-by-Step Approach

While specific instructions may vary slightly depending on your exact Avid brake model, the general process for installing an Avid disc caliper spacer set is as follows:

Preparation is Key

Before you begin, ensure you have the correct spacer set for your caliper type (CPS or Standard) and the desired rotor size increase. You will also need the appropriate Allen keys (typically 4mm or 5mm) and potentially a torque wrench to ensure bolts are tightened to the manufacturer's specifications. It's also a good idea to clean your rotor and pads with isopropyl alcohol to remove any grease or contaminants, especially if you've handled them extensively.

Step 1: Remove Existing Caliper

Carefully loosen and remove the two bolts securing your brake caliper to the frame or fork mount. Allow the caliper to hang freely, perhaps supported by a zip tie or resting on the frame, being careful not to let the brake hose kink.

Step 2: Install Spacers

Identify the correct spacers for your intended rotor size increase. For instance, if moving from a 160mm rotor to a 180mm rotor on a standard post mount, you'll typically need a spacer that adds 20mm of offset. Place these spacers onto the frame/fork mounting posts. If you have a CPS system, ensure the CPS washers are correctly positioned according to Avid's instructions.

Step 3: Position the Caliper

Slide the caliper onto the mounting posts, ensuring it sits over the spacers. Now, loosely thread the new, longer caliper mounting bolts (provided in the kit) through the caliper, the spacers, and into the frame/fork mount.

Step 4: Align the Caliper

This is the most critical step for ensuring optimal brake performance and preventing rubbing. With the wheel and rotor installed, spin the wheel to check for any rubbing. Then, gradually tighten the caliper mounting bolts in a criss-cross pattern. As you tighten, watch the gap between the brake pads and the rotor. The goal is to achieve a slight, even gap on both sides of the rotor. For CPS systems, the self-centring nature will assist, but fine-tuning may still be necessary. A common method is to tighten the bolts while the lever is held firmly squeezed – this can help centre the caliper over the rotor. Once aligned, tighten the bolts to the manufacturer's recommended torque setting (often around 6-8 Nm).

Step 5: Final Checks

Release the brake lever and spin the wheel again. Ensure there is no rubbing. Test the brakes by applying them firmly. Check for any unusual noises or sponginess in the lever, which might indicate an issue with the installation or bleeding.

Troubleshooting Common Issues

Even with a well-designed kit, you might encounter minor issues:

• Rotor Rub: If the rotor rubs, loosen the caliper bolts slightly, re-align, and re-tighten. Ensure the spacers are seated correctly and not causing any misalignment.
• Spongy Lever: This usually indicates air in the brake line, which may require bleeding the brakes. It's unlikely to be directly related to the spacers themselves unless the installation has caused a leak.
• Bolt Fitment: Ensure you are using the correct bolts provided in the kit. Using bolts that are too short will not secure the caliper properly, while bolts that are too long might bottom out in the frame/fork threads.

Where to Buy Avid Disc Brake Parts in the Netherlands?

For cyclists in the Netherlands looking to purchase Avid disc brake parts, including their convenient caliper spacer sets, several avenues are available. Many reputable online bicycle retailers based in the UK and mainland Europe will ship to the Netherlands. Websites such as Bike-Discount.de, Bike24.com, and various UK-based online stores like Chain Reaction Cycles or Wiggle (though note their current operational status and shipping policies) often carry a wide range of Avid components. You can also check with local Dutch bicycle shops; many maintain online stores or can order specific parts for you. When searching, use terms like "Avid remadapter" or "Avid spacer kit", specifying "post mount" to ensure compatibility. Be mindful of shipping costs and potential import duties if ordering from outside the EU, although within the EU, these are generally not an issue.

Conclusion

The Avid disc caliper spacer set is a testament to thoughtful engineering, providing a practical and efficient solution for cyclists seeking greater flexibility with their rotor sizes. By simplifying the process and including all necessary hardware, Avid empowers riders to enhance their braking performance without resorting to overly complex or unsightly adaptors. Whether you're upgrading for more power or simply refining your setup, understanding and utilising these spacers can be a key step towards achieving your ideal cycling experience. Remember to always consult your brake manufacturer's documentation and torque specifications for the safest and most effective installation.

Frequently Asked Questions (FAQs)

Q1: Can I use Avid spacers with non-Avid brake calipers?
A1: While the Avid spacers are designed for Avid calipers, they might work with other brands that use standard post mount spacing, provided the caliper design and mount points are compatible. However, it's always best to use components designed to work together for guaranteed performance and safety. The included hardware is specifically designed for Avid CPS and Standard systems.

Q2: What rotor size can I increase to with these spacers?
A2: The specific increase depends on the spacer thickness provided in the kit and the clearance available on your frame and fork. Typically, these kits are designed for common upgrades like going from a 160mm to a 180mm rotor, or a 180mm to a 200mm rotor. Always check your frame and fork's maximum rotor size limitations.

Q3: Do I need to bleed my brakes after installing spacers?
A3: If the brake system was working correctly beforehand and the installation doesn't involve disconnecting the hydraulic line, bleeding is usually not necessary. However, if you notice a spongy lever feel or reduced braking power after installation, a brake bleed might be required.

Q4: Are Avid CPS spacers different from standard spacers?
A4: Yes, they are. CPS spacers are designed to work with Avid's unique CPS washer system, which aids in caliper alignment. Standard spacers are for calipers that mount directly without the CPS washers. The kit will specify which type it is, and it includes the appropriate bolts for both.

Q5: How do I know if my bike has post mounts?
A5: Post mounts are a standard disc brake mounting interface where the caliper bolts directly to 'posts' on the fork or frame. These posts are typically 74mm apart for standard post mounts. If your brake caliper bolts directly onto these posts without an intervening bracket (for the base rotor size), you likely have a post mount system.