Hub Fitment: WY
             
1 stands for spokes, for example: 40S, 60S, 80S                  
2 stands for bearing: "00"means the 1"of inner hole of plane bearing after year 2000; "01"means the 3/4" inner hole of plane bearing after year 2000; "99"means the 3/4" inner hole of inclined bearing before year 1999                  
3 stands for the brake disc, as R stand for the single disc for front wheel; RR stand for the dual disc for front wheel; L stand for the rear wheel    
For example: WY4000RR: It's 40 spokes dual disc for front wheel, 1" inside hole of plane bearing after year 2000.