FSA EVO to MegaExo Reducer
FSA

FSA EVO to MegaExo Reducer

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Slim, ultra-light adapter that lets 24mm FSA Mega Exo and Shimano HollowTech II cranks run in BB386EVO frames with a PF30 bottom bracket installed. Aluminum core with plastic sleeve for low friction and creak resistance.

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Product Details

Overview & Technology

FSA's EVO to MegaExo Reducer (PN 380288 / MPN 200-3202) is a precision-machined adapter that converts a BB386EVO shell fitted with a PF30 bottom bracket to accept 24mm crank spindles — specifically FSA Ø24mm Mega Exo alloy cranksets and Shimano HollowTech II cranks. At just 17.5g, this is a minimal-weight solution when swapping cranks between frames or when updating drivetrains without changing your frame's bearings. The part uses an aluminum core covered in a low-friction plastic sleeve. The aluminum provides stiffness and dimensional accuracy for a secure fit, while the plastic sleeve protects bearing surfaces, reduces creaks, and eases installation. Its compact profile keeps Q-factor changes minimal and preserves chainline when used with compatible cranksets.

Key Features & Benefits

Designed for simple, reliable conversion, the EVO → MegaExo reducer offers several practical benefits: • Compatibility: Adapts BB386EVO shells (with PF30 bottom bracket already installed) to 24mm spindles — supporting FSA Mega Exo and Shimano HollowTech II cranks. • Featherweight: At 17.5g the adapter adds negligible mass to your drivetrain. • Durable construction: Aluminum core for precision fit, plastic outer sleeve to prevent metal-on-bearing contact and dampen noise. • Easy swap: Fits into existing PF30 bearings without special tools beyond standard crank installation tools. Together these features make the adapter an affordable, low-effort way to run popular 24mm cranksets in modern wide-shell frames without replacing bearings or shell hardware.

Fit & Compatibility

This adapter is specifically made for frames with a BB386EVO shell that already have a PF30-style bottom bracket installed. It accepts crank spindles with a 24mm diameter — which covers FSA Ø24mm Mega Exo alloy cranksets and Shimano HollowTech II series. The reducer will not convert frames to accept larger spindle diameters (for example 30mm or specialty DUB systems). Check your setup before purchasing: if your frame currently has pressed-in bearings or an integrated (non-PF) system, or your crank uses a spindle other than 24mm, this adapter is not suitable. The adapter is a simple press/fit sleeve that rides inside your PF30 bearings; ensure bearings are correctly seated and in good condition for best performance.

Who This Is For

Road and gravel riders, mechanics and bike builders who want to fit 24mm cranksets into frames with BB386EVO/PF30 bottom brackets will find this adapter especially useful. It's ideal if you're upgrading a crankset, swapping bikes between frames, or keeping your original bearings while changing drivetrain brands. Shops and home mechanics will appreciate the lightweight, inexpensive nature of the part — it avoids bearing swaps and keeps service time low. Riders focused on weight savings and noise-free operation will value the aluminum core plus plastic sleeve construction for long-term durability and low creak risk.

Key Features

  • ✓ Converts BB386EVO (with PF30 BB) to accept 24mm crank spindles
  • ✓ Compatible with FSA Ø24mm Mega Exo and Shimano HollowTech II
  • ✓ Precision aluminum core for a tight, accurate fit
  • ✓ Protective low-friction plastic sleeve reduces creaks and wear
  • ✓ Ultra-light at just 17.5 grams — negligible weight penalty
  • ✓ Simple install — fits into existing PF30-style bottom bracket bearings

Specifications

BB Shell Type BB386EVO
Crank Spindle Diameter 24mm

Product Identifiers

Vendor Item # 200-3202
UPC 400310050229

Frequently Asked Questions

What does this adapter do?

The adapter converts a BB386EVO frame (with a PF30 bottom bracket already installed) to accept 24mm crank spindles used by FSA Mega Exo and Shimano HollowTech II cranksets. It is a sleeve that sits between the spindle and the PF30 bearings to ensure correct fit and alignment.

Do I need to replace my bottom bracket to use this adapter?

No — the reducer is designed to work with a PF30-style bottom bracket or bearings already installed in a BB386EVO shell. You do need those bearings in place; if your frame has pressed-in or non-PF bearings, additional hardware or a different solution may be required.

Is this compatible with SRAM DUB or 30mm spindles?

No. This adapter is specifically for 24mm spindles. It will not fit 28.99mm/30mm spindles (including SRAM DUB) or other oversized spindle systems.

Will the adapter prevent creaks at the bottom bracket?

The plastic sleeve helps reduce metal-on-bearing contact and can mitigate some creaks caused by poor interface fit. However, creaks originating from worn bearings, loose preload, or frame interfaces will need to be addressed separately.

How durable is the adapter and when should I replace it?

The aluminum core provides dimensional stability while the plastic sleeve protects bearing surfaces. Inspect the plastic sleeve for wear or deformation during routine service; replace the adapter if the sleeve is damaged or if you notice play or noise at the crank interface.

Are any special tools required for installation?

No special adapter-only tools are required beyond the standard tools used for crank installation/removal. Ensure bearings are properly seated and use the crank manufacturer’s recommended torque and installation procedures.

Buying Guide

When buying a bottom bracket adapter, first verify your frame's shell standard and the spindle diameter of the crank you want to fit. Adapters like the FSA EVO → MegaExo are purpose-built for BB386EVO shells that already have PF30-style bearings and only work with 24mm spindles. Choosing the correct adapter saves money and time by avoiding full bottom bracket replacements. Consider construction and weight: aluminum cores give stiffness and accuracy, while plastic or polymer sleeves protect bearings and reduce noise. For everyday riders and weight-conscious racers alike, a low-mass, well-fitting adapter is a smart, cost-effective way to mix and match cranks and frames without compromising performance.

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