Bottom Brackets

Our bottom brackets are designed for smooth and efficient performance on different types of bikes. Whether you are a demanding road cyclist or prefer to go off-road on a rugged mountain bike, our CEMA bottom brackets are an essential part of your drivetrain.

Not sure which bottom bracket you need? Answer a few questions about your frame and crankset and find out which bottom bracket you need.

Find your bottom bracket

This is because a bottom bracket connects the crank (pedal set) to the frame and converts the rider's power into motion. At CEMA Bearing, we reduce drag by using high-quality SRC ceramic or all-stainless steel bearings in CNC-milled aluminum cups.

Our pressfit bottom brackets are equipped with an Interlock system, which means that both cups of the bottom bracket are connected by means of a screw connection. This ensures optimal stability in the bottom bracket and prevents annoying creaking noises. At CEMA Bearing, we strive to bring you the best bottom brackets on the market so that you get your optimal cycling performance. Order today and experience the difference!

Crank type

The crank type indicates which type of bottom bracket axle (spindle) your crankset uses. Different brands and systems use different diameters and designs. Choosing the right crank type ensures a correct fit and proper functioning of your bottom bracket.
The values at a glance:
Shimano — 24 mm axle; also suitable for other cranksets with a 24 mm axle.
SRAM GXP — 24 mm axle that steps down to 22 mm (stepped spindle) on the non-drive side.
SRAM DUB — 28.99 mm axle; also suitable for DUB WIDE and SL and other cranksets with a 28.99 mm axle.
FSA386/Rotor 30mm — all modern cranks with a 30 mm axle.
CAMPA UT — Campagnolo Ultra-Torque: two-piece 25 mm axle with a Hirth joint in the middle.
PRAXIS M30 — 30 mm axle that steps down to 28 mm (stepped spindle) on the non-drive side.
BB30/PF30 — older standard with a short 30 mm axle. Only suitable for BB30 and PF30 frames.

Shimano

SRAM GXP

SRAM DUB

FSA386/Rotor 30mm

CAMPA UT

PRAXIS M30

BB30/PF30

Frame Inner Diameter

The frame inner diameter is the internal diameter of the bottom bracket shell of your bike frame. Measure the internal diameter of the bottom bracket shell and then select the matching size. Together with the frame width, this is an important parameter for determining the exact type of bottom bracket shell.

37 mm

41 mm

42 mm

46 mm

33 mm (BSA thread)

36 mm (ITA thread)

44 mm (T45 thread)

46 mm (T47 thread)

Frame

The frame attribute describes the type of bottom bracket shell of your bike frame. It indicates how the bottom bracket is mounted in the bottom bracket shell of the frame.
The values at a glance:
Threaded — in a threaded frame, the bottom bracket shell has an internal thread into which the bottom bracket is screwed.
Pressfit — in a press-fit frame, the bottom bracket shell has a smooth inner surface into which the bottom bracket is pressed.

Threaded

Pressfit

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Welcome to CEMA Bearing, the right place for high-quality bicycle bearings. Our bearings are made with the latest technologies and materials to give your bike the best performance and durability. Whether you are looking for bottom brackets, derailleur pulleys or wheel bearings, we offer a wide range of bearings for all kinds of bikes. Order today and feel the difference our bearings make to your ride.

Bottom Brackets

BSA for Shimano

BSA for SRAM DUB

BSA for SRAM GXP

BSA for FSA386/Rotor/Raceface 30mm

BSA for PRAXIS M30

ITA for Shimano

ITA for SRAM DUB

ITA for SRAM GXP

ITA for FSA386/Rotor/Raceface30mm

ITA for PRAXIS M30

T45 for Shimano

T45 for SRAM GXP

T47 for Shimano

T47 for SRAM DUB

T47 for SRAM GXP

T47 for FSA386/Rotor/Raceface 30 mm

T47 for Campa UT

T47 for PRAXIS M30

T47 - TREK for Shimano

T47 - TREK for SRAM DUB

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