 We currently offer 10 different bottom bracket fitment types, and with all the various bottom brackets and fitting standards, selecting the right one can be a source of confusion. We want to arm you with all the knowledge and understanding you’ll need to be able to identify the correct type for your setup from our range. To help keep your bottom bracket going for longer, we offer replacement steel and upgrade ceramic hybrid bearings, as well as spare parts for many of our bottom brackets, we can even service your bottom bracket for you if required (service on request).
By using the chart at the bottom of this article, you will be able to find your compatible bottom bracket based on the cranks and bottom bracket frame type you are using.
Crank Types
Although there are one, two, and three piece cranks available on the market, our range of bottom brackets focusses on the current two piece designs, which refers to one of the crank arms which has an attached spindle, and the other crank arm is seperate which bolts to the crank spindle.
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24mm Spindle - This size option has been made popular by the Shimano Hollowtech II system, but the 24mm diameter spindle cranks have also been used by brands such as Raceface, FSA, and Rotor.
View our BSA Threaded Hollowtech II compatible bottom brackets steel bearings HERE and ceramic bearing version HERE
View our BB86 (41x86.5mm), BB89.5 (41x89.5mm), BB92 (41x92MM) 24mm press fit bottom bracket HERE
View our PF30 / 24mm spindle diameter press fit bottom bracket HERE
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24/22mm GXP Spindle - This crank type uses a 24mm diameter spindle for the driveside bearing, which steps down to 22mm diameter on the non-drive side bearing. This type of crank is used by SRAM and Truvativ.
View our BSA Threaded GXP compatible bottom brackets steel bearings HERE and ceramic bearing version HERE
View our BB86 (41x86.5mm), BB89.5 (41x89.5mm), BB92 (41x92MM) GXP press fit bottom brackets HERE |
30mm Spindle - This size is used by SRAM with their BB30/PF30 cranks, Raceface Cinch cranks, Hope cranks, as well as some models of Rotor and FSA cranks.
Note - 30mm crank spindles come in different length options, the shorter 95mm / 101.5mm size options are compatible with PF30 bottom bracket shells only.
View our range of 30mm compatible bottom brackets HERE
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 28.99mm DUB Spindle - The SRAM DUB bottom bracket standard was introduced in 2018 and uses a 28.99mm spindle diameter, offering greater stiffness than GXP, and lighter than BB30 cranks.
View our BSA Threaded DUB compatible bottom brackets HERE
View our PF30 DUB bottom bracket HERE
View our (41x89.5mm), MTB (41x92mm), Road (41x86.5mm) DUB press fit bottom bracket HERE |
 Bottom Bracket Shell Types
There are 2 bottom bracket shell types, 'threaded' and 'press-fit' bottom bracket.
Press-Fit - Establishing what size your press fit bottom bracket shell is much easier if you remove the bottom bracket bearings from the frame, as you will need to measure the internal diameter of the bottom bracket shell, as well as the width.
You will need to determine the bottom bracket shell width and internal diameter for the correct bottom bracket and spacer setup when installing the bottom bracket. Using vernier calipers, measure the distance between the opposite bottom bracket shell faces to determine the width in mm. Our press fit bottom brackets support both 41mm and 46mm internal diameter bottom bracket shell internals, so this measurement will need to obtained as well as the shell width.
See the chart at the bottom of this article for crank and bottom bracket shell compatibility.
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 BSA Threaded Bottom Brackets - BSA threaded bottom bracket shells feature threads on both sides of the shell, and come in 4 width options, 68mm, 73mm, 83mm or 100mm, with 68mm and 73mm being most common. Our BSA threaded bottom brackets are compatible with the 68mm and 73mm versions, but can also be used on 83mm and 100mm by removing the bottom bracket center tube.
You will need to establish the bottom bracket shell width for the correct spacer setup when installing the bottom bracket. Using vernier calipers, measure the distance between the opposite bottom bracket shell faces to determine the width. A ruler will also work if you don't have access to calipers.
Our bottom brackets use the most commonly used English thread type, the non-drive cup tightens clockwise, and the drive-side uses a left hand thread, so tightens counter clockwise.
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