Identify Your Bottom Bracket type

Bought the wrong bottom bracket? Spent money on a part that doesn't fit?

It happens more often than you think. With names like BSA, BB30, PF92, and T47 floating around, it's easy to get confused.

But here's the good news: identifying your bottom bracket type is actually simple.

Step 1: Check Your Bottom Bracket Type (Frame)

Is it threaded or Press-Fit? Look inside your frame's bottom bracket shell (the hole where the BB goes). You're checking for one thing: threads.

Threaded Bottom Brackets

See threads inside the shell? Like the inside of a screw hole? You have a threaded bottom bracket. The cups screw into your frame.

Press-Fit Bottom Brackets

Smooth inside with no threads? You have a press-fit system. While standard cups are pressed directly into the frame, we define this standard with our CRODER TUBE-LOCK technology to ensure a secure, noise-free fit.

Common Frame Standards

Once you know if it's threaded or press-fit, here are the most common bottom bracket types:

Threaded Standards:

BSA (British Standard) - The most common

• Width: 68mm (road) or 73mm (mountain bikes)
• Found on most bikes from Trek, Giant, Specialized, Canyon
• Also called "English threaded"

T47 - Modern threaded standard

• Width: 86mm or 92mm
• Larger threads (47mm diameter) for extra stiffness
• Increasingly popular on high-end bikes

ITA (Italian) - Less common

• Width: 70mm
• Mostly on classic Italian bikes

Press-Fit Standards:

BB86/92 - Most common press-fit

• Shell diameter: 41mm
• Width: 86mm (road) or 92mm (mountain)
• Works with 24mm, DUB or 30mm spindles

BB30 - For 30mm spindles

• Shell diameter: 42mm
• Width: 73mm
• Bearings pressed directly into frame

PF30 - For 30mm spindles

• Shell diameter: 46mm
• Width: 73mm
• Bearings in plastic cups

BB386 - Wide press-fit

• Shell diameter: 46mm
• Width: 86.5mm or 68-86mm
• Works with 24mm, DUB or 30mm spindles

Step 2: Check Your Crankset Spindle

The spindle (axle) is the rod connecting your left and right cranks. There are three common sizes:

• 24mm - Shimano Hollowtech II
  The most universal standard. Found on: Most Shimano groups (105, Ultegra, Dura-Ace, Deore, XT, XTR), SRAM GXP cranks, FSA MegaExo, Race Face X-Type.
  How to identify: If you have Shimano cranks, it's probably 24mm.
• 29mm - SRAM DUB
  SRAM's unified standard (introduced around 2018). Found on: Newer SRAM road groups (Force, Red from 2018+), Newer SRAM mountain groups (GX, X01, XX1 from 2018+).
  How to identify: Look for "DUB" printed on the crank arm or spindle.
• 30mm Spindles
  The larger, stiffer option. Found on: Rotor cranks, FSA (some models), Older SRAM (pre-DUB), Many high-end cranks.
  How to identify: The spindle will be noticeably thicker.

Quick Compatibility Chart

Now that you know your frame and spindle, here's how they match: