The first question on your mind might be: Is a 24mm bottom bracket compatible with a SRAM GXP crankset? If so, you are not alone. You may have also heard of the Shimano PF30 and Kogel bottom brackets. Which one should you choose for your bike?
SRAM GXP cranks
The GXP crankset is one of the more popular standards in the cycling industry today. It uses a tapered spindle that measures 24mm on the drive side and 22mm on the non-drive side. The taper is on the splined part of the spindle, not the bearing contact surface. Because of its different diameter, it requires a different bottom bracket bearing than other cranks.
The GXP was designed as a way to skirt around Shimano’s patents while keeping close compatibility with frames. Its stepped crank arm attaches to the axle with a shallow taper, unlike Shimano’s traditional bottom bracket. Another feature of the GXP is the fixed/floating bearing arrangement. Unlike most cranksets, the GXP’s design allows the axle to rotate more freely.
The GXP crank is compatible with any SRAM integrated chainring. It has a hollow carbon fiber arm that makes it light, strong, and elegant. You can purchase the crankset in lengths ranging from 165 to 177.5mm. Its 8-bolt interface is also compatible with any SRAM spider or chainring.
SRAM GXP bottom bracket
SRAM offers a number of bottom bracket options for mountain bikes, including the GXP Pressfit MTB Bottom Bracket system. This system is composed of steel bearings and two sets of nylon cups. It is compatible with pressfit bikes and Truvativ cranksets.
The SRAM GXP bottom bracket supports the cranksets of the SRAM GXP Team, as well as the Truvativ mountain crankset. It is also compatible with 68mm and 73mm bottom bracket shells. It also comes with an updated GutterSeal to improve sealing and reduce drag.
The SRAM GXP bottom bracket is based on a design created by Truvativ, which was acquired by SRAM in the early 2000s. The GXP bottom bracket moves the bearings outward beyond the frame’s extremities, reducing the amount of cantilever torque transferred. It has been a popular choice for many riders for over a decade, but it is still subject to a few quirks and can be difficult to fit in some frames.
Shimano PF30 bottom bracket
The Shimano PF30 bottom bracket is an excellent choice for a road bike. Compatible with 24mm spindle cranksets, it features an integrated unit that requires no spacers or adapter. Ceramic bearings on both sides of the bottom bracket are located outside the frame, giving your crank arms direct support. This makes the bracket more reliable and stable.
The PF30-SHIM bottom bracket is designed to fit PF30 and BB30 frames. It works with 24mm spindle cranksets and can be installed easily on a pressfit 30 frame. The adapter taps into the BB shell and can be installed prior to installing the cranks.
Other advantages of the PF30 bottom bracket include its carbon steel bearings, which offer superior hardness and load capacity. A rubber seal also protects the bearings from dirt, while keeping lubrication inside. This combination of features is the main reason for PF30’s popularity.
The PF30 bottom bracket has the narrowest shell width. Despite its size, the PF30 can accept the largest spindle diameter and is compatible with most cranksets. However, there may be problems with the bearings if the spindle is too short. A stack of spacers may be the best solution, but it is not ideal.
PF30 bottom brackets are designed with structural linkage, which results in better performance and durability. These bottom brackets are compatible with the largest variety of cranksets. They are also compatible with many different types of cranksets, including press-fit. Although these bottom brackets are not perfect, they are the best choices for many cycling enthusiasts.
Kogel bottom bracket
If you’re looking to upgrade your bottom bracket to a 24mm version, the Kogel bottom bracket is a great choice. Designed to fit PF30 frames, this bottom bracket converts your bike to 24mm cranks. It comes in gold color and is part of a limited production run. It can be used on road bikes and is also available in mountain and cyclocross configurations.