The SRAM PF30 [paid link] bottom bracket (PressFit 30) has long been a choice for performance-focused riders seeking stiffness and weight savings. However, compatibility with cranksets, frames, and bearing configurations often sparks confusion. This guide dives into what truly works with PF30 [paid link], where the problems usually arise, and how to make informed setup choices to maximize drivetrain performance.

Understanding the PF30 Design

PF30 [paid link] is a press-fit standard developed by SRAM to provide a larger bearing interface within a 46mm diameter shell. Unlike traditional threaded bottom brackets, PF30 uses pressed-in cups with 30mm spindle compatibility. While it offers a sleek, lightweight, and wider shell for better stiffness, it requires precision for long-term performance.

The defining characteristics include:

• 46mm internal frame shell diameter
• 68mm (road) or 73mm (MTB) shell width
• 30mm crank spindle compatibility
• Bearing cups pressed directly into the frame (no threads)

Its versatility depends heavily on proper installation and compatible component selection.

What Works with SRAM PF30

Direct-Compatible Cranksets

Cranksets with 30mm spindles are inherently compatible with PF30 when shell width and bearing spacing align. SRAM Force, RED, and Rival series GXP [paid link] cranksets originally required adapters but many SRAM BB30 cranksets are natively PF30-ready. In addition:

• SRAM DUB [paid link] Cranksets can work with a dedicated PF30 DUB [paid link] bottom bracket, offering improved bearing life and simplicity.
• Rotor 3D+ Cranksets and Easton EC90 are also known to fit PF30 shells directly with proper spacers.
• Cannondale Si/SL Cranksets may be compatible when matched with appropriate bearing depth and spindle length.

Frame Compatibility and Tolerances

Frames with precisely machined and aligned PF30 shells—typically from premium manufacturers—tend to support long-term performance. Brands such as Specialized, Cannondale, and Trek (in specific models) have historically provided PF30-ready shells with tight tolerances.

Adapters for Broader Compatibility

The PF30 shell can be adapted to fit a wide range of cranksets. BB conversion kits allow for cross-compatibility with:

• Shimano Hollowtech II (24mm spindle)
• SRAM GXP [paid link] (24/22mm stepped spindle)
• Campagnolo Ultra-Torque and Power-Torque

Brands like Wheels Manufacturing, Praxis, and Enduro offer press-fit or thread-together adapter bottom brackets that fit snugly into PF30 shells while housing alternate spindle diameters.

What Fails with PF30: Key Compatibility Issues

Frame Shell Deformation and Misalignment

PF30’s press-fit nature requires precise tolerances. Unfortunately, many carbon frames have minor imperfections, leading to:

• Bearing misalignment
• Creaking under load
• Accelerated bearing wear

Even small inconsistencies in shell diameter can result in poor fit, leading to premature failure of both bearings and crank interfaces.

Bearing-to-Spindle Mismatch

Using a crankset with the wrong spindle diameter—without the right adapters or conversion bottom bracket—can cause excessive side play or binding. Common mistakes include:

• Using a 24mm Shimano crank directly in a PF30 shell without an adapter
• Installing GXP [paid link] spindles without accounting for their stepped diameter

Poor-Quality Bottom Brackets

Low-grade PF30 bottom brackets may lack proper sealing or misalign during installation. In particular, budget aluminum or plastic cups can warp under pressure, leading to:

• Water ingress
• Contaminated bearings
• Unstable crank rotation

What to Avoid When Choosing PF30 Components

To maintain optimal compatibility and performance with SRAM PF30, avoid the following:

• Unverified Cranksets: Always confirm crank spindle diameter and length before attempting installation.
• Non-threaded Adapters in Loose Tolerance Shells: Press-fit adapters in out-of-spec shells often migrate or creak over time. Thread-together designs help mitigate this.
• Mixing BB Standards: Attempting to install a BB386 EVO or BBRight-specific crank into PF30 without the correct conversion often results in chainline and spindle issues.
• Improper Bearing Spacing: Inadequate use of spacers or incorrect bearing insertion depth leads to drivetrain inefficiency and wear.

Tips to Ensure Reliable Compatibility

Measure Before You Install

Use calipers to confirm your frame’s shell diameter and width. Measure the crank spindle length and diameter to ensure compatibility with your chosen bottom bracket type. Manufacturers often provide spec sheets for reference.

Choose Quality Bearings and BB Units

Invest in ceramic or hybrid bearings with quality seals. Thread-together bottom brackets from respected brands add stability in otherwise problematic frames.

Use Proper Installation Tools

A bearing press [paid link] is essential for accurate and even installation. Avoid hammering or makeshift methods that damage shell interfaces or misalign bearings.

Recheck Torque and Fit

After a few rides, inspect for movement, creaking, or side play. Periodic rechecking of torque and cup stability is especially important for press-fit systems.

PF30 Bottom Bracket and Crank Compatibility Matrix

Crankset Type	Spindle Diameter	PF30 Compatibility	Notes
SRAM BB30	30mm	Direct fit	Native fit, no adapters needed
SRAM GXP	24/22mm	Adapter required	Use GXP-to-PF30 adapter
Shimano Hollowtech II	24mm	Adapter or conversion BB	Use BB with internal sleeve and spacers
Campagnolo Ultra-Torque	25mm	Adapter or conversion BB	Some setups may require specific cups
SRAM DUB [paid link]	28.99mm	PF30 DUB bottom bracket	Improved sealing and fit

Conclusion

SRAM PF30 offers performance advantages in stiffness and weight, but compatibility relies on precision and correct component matching. Use only cranksets with matching spindle specs or trusted adapter bottom brackets for alternate standards. Always assess your frame’s shell tolerances and avoid poorly fitting or low-grade parts to ensure lasting performance. When set up correctly, the PF30 system is both efficient and race-ready.