Avid Post Spacer

Avid Post Spacer Set is a simple, effective solution for increasing rotor clearance on post-mount calipers. The kit shifts the caliper outboard to accommodate larger rotors—helpful when upgrading rotor size or swapping wheelsets—while keeping your existing post-mount caliper and frame/fork interfaces.

The spacers are precision-machined for consistent alignment and repeatable pad-to-rotor positioning. Each kit ships with stainless caliper mounting bolts (compatible with both CPS and standard mounting hardware) to ensure corrosion resistance and secure fastening in variable weather and trail conditions.

Built for reliable rotor upgrades. The Avid Post Spacer Set is available in common increments (for example 10mm and 20mm variants) so you can match the spacer to the rotor size change you need—170mm up to 203mm in supported variants. The included stainless mounting bolts make installation straightforward and durable.

Real-world benefits:

• Precision-machined aluminium alloy spacer (anodized) for stiffness and low weight.
• Stainless caliper mounting bolts included for corrosion resistance and long-term fit.
• Options for front 170mm, front 180mm/rear 160mm, and F203 (203mm) configurations to cover most upgrade scenarios.

The Post Spacer Set is designed for post-mount caliper systems and pairs with frames and forks that use post mounts. Select the spacer size that matches the rotor increase: e.g., the 10 S kit suits a front 170mm conversion, the 20 S kit covers front 180mm or rear 160mm changes, and the F203 variant supports 203mm front rotors.

Hardware is included for both CPS and standard caliper mounting patterns so you can bolt the spacer and caliper directly to the post mount. Always double-check rotor-to-frame/fork clearance and follow caliper alignment steps after installing spacers—some frames or forks with tight stays may limit available rotor sizes.

This adapter set is for mountain riders who want to upgrade rotor size without changing calipers or brake platforms: riders adding more stopping power for heavy trail days, bikepackers fitting bigger rotors for long descents, and mechanics who need a compact, reliable spacer option in the toolbox.

If you're converting from smaller rotors to 180mm or 203mm for increased heat capacity and braking leverage, a post spacer kit is a low-cost, low-weight way to get there while retaining your current brakes.

When choosing a post-mount spacer, prioritize the exact rotor sizes you plan to run and confirm your frame or fork has sufficient clearance. Pick the smallest spacer that achieves the target rotor size—this minimizes changes to caliper alignment and reduces the chance of interference.

Also consider hardware: kits that include stainless bolts (like this Avid set) save you a trip to the bolt drawer and ensure long-term corrosion resistance. If you run aggressive downhill or heavy bikepacking loads, opt for the larger rotor-compatible variants for better heat management and braking leverage.