(1) Bicycle Headsets Bearing
Bearing steel material-based, high-grade stainless steel, or hybrid ceramic ball bearings, and some also use titanium Process. The basic use of low-end headset ball cage structure, do not use bearings.
27.15 x 38 x 6.5mm   45°/45°          30.15 x 41 x 7 mm    45°/45°         
30.15 x 41 x 6.5mm 45°/45°            30.15 x 41 x 6.5mm 36°/45°      
30.15 x 39 x 6.5mm 45/45°              30.15 x 41.8 x 6.5 mm 45/45°      
30.15 x 41.8 x 7 mm 45/45°             30.5 x 41.8 x 8 mm 45/45°               
30.5 x 41.8 x 8 mm 45/45°               33.5 x 43.8 x 7 mm 30/45°           
34.1 x 46.8 x 7mm 45/45°                34.1 x 46.9 x 7mm 45/45°                
37 x 49 x 7 mm 45/45°                     39.7 x 50.8 x 7mm 90/90° 
40x 51.8 x8 mm 36/45°                    40 x 52 x7 mm 45/45°        
40 x 52 x 8mm 45/45°   40 x 52 x 12mm 45/45°   40 x 52 x 6.5 mm 36/45° 
(2) Bicycle BBs Bearing
Axis (BBs) is the most common special regulation ball (which 163110-2RS and 173110-2RS use up) inside use, there are other types of special regulation ball and conventional ordinary ball, as 6802-2RS, 6803-2RS, 6804-2RS, 6805-2RS, 6902-2RS, 6903-2RS, 6905-2RS so on. 15267,15268,17287,173110,163108,16287,16277,6805N,MR2437, 163110 
(3) Bicycle Front/Rear Hub Bearing 
Hubs (front / rear hubs) using conventional single row ball bearing inside more, and some use special rules single / double row ball bearing. As 6804-2RS, 6805-2RS, 6903-2RS, 6904-2RS, 6905-2RS, currently in Taiwan generally upscale hubs, which use a small size specially tapered roller bearings (mainly for high-end car customization). Front wheel hub bearing to separate the main, rear and some use double row bearings, or two separate parallel use.
608 2RS (chrome)   609 2RS ( chrome)    6000 2RS (stainless steel)      
6001 2RS (stainless steel)     6002 2RS (chrome)    6002 RS (stainless steel)           
6003 2RS (chrome)     6003 2RS (stainless steel)     6900 2RS (chrome)          
6901 2RS (stainless steel)    6902 2RS(stainless steel)        
6903 2RS (chrome)     6903 2RS (stainless  steel)  
(4) Bicycle Sprockets Bearing
 Sprockets in use to 686-2RS, 608-2RS more, with stainless steel or ceramic ball bearings based 
(5) Bicycle Pedals Bearing 
Foot (pedals) which use 686-2RS / ZZ, 688-2RS / ZZ, MR137-ZZ-based, and some also use micro-needle roller bearings HK0810, HK1010. 
(6) Bicycle Pivots Bearing 
Pivot (pivots) which use micro thin-walled 688-2RS, 6800-2RS, 6801-2RS, 6900-2RS, 6902-2RS like more.

Bicycle Bearing SizeBearing Nod(mm)D(mm)B(mm)Bearing Nod(mm)D(mm)B(mm)618/1-------------618/9-2z618001019561820100125136180112215618211051301361802152456182211014016618031726561824120150166180420327618281401751861805253776183216020020618063042761834170215226180735477618381902402461808405276184020025024618094558761844200250246181050657618522603202861811557296186030038028618126078106186432040038618136585106187236044038618147090106187638048046 
600 Ceramic bearingsBearings ModeldDD-dB603396.00036044128.00046055149.0005605LL5149.000560661711.0006606LL61711.000660771912.0006607LL71912.000660882214.0007608L82214.0007608LL82214.000760992415.0007609LL92415.0007