*** This page needs an update. I will get to it as soon as i can.
Here is a list of the known various bottom bracket types/sizes as well as hub bearing sizes you get for a newish BMX.
This should be helpful when ordering or looking for replacements.
Using the diagram below you can see how to measure your bearing and select the right size below.
I.D: Inner Diameter
O.D: Outer Diameter
W: Width
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** Mid Bottom Bracket **
Mid 19mm / R12 2RS
ID: 19mm
OD: 41mm
Special size: Yes (Not available from local bearing shops)
Mid 22mm / R12RS-22
ID: 22mm
OD: 41mm
Special size: Yes (Not available from local bearing shops)
Mid 24mm / TBA
ID: 24mm
OD: 41mm
Special size: Yes (Not available from local bearing shops)
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** Spanish Bottom Bracket **
Spanish 19mm / 6904
ID: 19mm
OD: 37mm
Special size: Yes (Not available from local bearing shops)
Spanish 22mm / 6904
ID: 22mm
OD: 37mm
Special size: Yes (Not available from local bearing shops)
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** Euro Bottom Bracket aka Threaded type **
Euro 22mm / 8539
ID: 22mm
OD: 32mm
Special size: Yes
Euro 19mm / TBA
ID: 19mm
OD: 32mm
Special size: Yes
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Hub Bearings:
Primo N4 front hub bearing – 6000 2RS
ID: 10mm
OD: 26mm
Special size: No
Primo Mix, Remix driver, Fit Flow driver, KHE Astern/Geisha driver, Odyssey Hazzard driver, Bicycle Union driver, Joytech driver – 6802 2RS
as well as Fly Bikes front hubs.
ID: 15mm
OD: 24mm
Special size: No
Primo Mix/Remix and N4 FL front hub shell bearing – 6902 2RS
ID: 15mm
OD: 28mm
Special size: No
Primo Freemix:
Driver Bearing: 6802 2RS
ID: 15mm
OD: 24mm
Special size: No
Primo Freemix Hub Drive Side Bearing:
7905 2 RS
ID: 25mm
OD: 42mm
Special size: no
Primo Freemix Hub Non Drive Side Bearing:
6202 2 RS
ID: 15mm
OD: 35mm
Special size: No
Profile rear Hub shell Bearing – 6903 2RS
ID: 17mm
OD: 30mm
Special size: No
KHE Hub Shell Bearing – 7905 2RS
ID: 25mm
OD: 42mm
Width: 9mm
Special size: No
Odyssey Vandero Bearing – 16287
ID: 15mm
OD: 26mm
Special size: Unknown
United, Giant rear hub shell bearing – 15267 2RS
ID: 15mm
OD: 26mm
Special size: unknown
* Special Size i.e Not available in bearing shops
United LRD Hub | BMX Direct LRD Hub | Bicycle Union LRD Hub
Shell Bearings: 2x 6902 2RS
Driver Bearing: TBA
United SU3 Front hub bearing
15267-2RS
15x26x7mm
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“What’s the difference between the 19mm Primo mid BB and the Spanish BB?”
The main difference between the 2 types is the outer diameter of the bearing.
The ‘Mid’ bearing is 41mm on the outside and a ‘Spanish’ BB is 37mm.
So depending on the frame you have you should choose the correct option.
**Last up dated August 2019
10 responses to “BMX Hub and Crank Bearing sizes”
How much the bearing
For bmx
Size = r12-2rs
Available here: https://bmxdirect.net/online-store/primo-mid-bb-kit-19mm/
ZAR395.00
Do u have the 5902-RS bearing??
No sorry, we dont stock that size.
I have a bike I have had for awhile now need new crank bearings and I can’t find the specs for the bike tried using the serial number and not sure if or how I can measure it to find the size
I just updated the post on how to measure the a bearing. If you can measure it accurately and match the sizes below you should know which is the correct one to get.
What size bottom bracket does the Wethepeople Justice frame and fork ( the 2014 model) have here at BMX Direct? I want to build up a bike out of it, and don’t know which BB kit to get.
The Wethepeople uses a Mid bb, but the size depends on the crankset you will get. Either 19mm or 22mm.
Thanks! I wondered if you knew what size dropout the forks have as well, 14mm 0r 10mm? BTW I have a 19mm crankset, so it will work just fine.
Hmm, not sure. Very likely a 10mm dropout. You can measure it with a ruler.
Otherwise you can send me a whatsapp message form the website if you need any additional help!