Although the bicycle riding functionality was disabled in What's Shenmue before its release, it turns out that the animation data for Ryo has been left on the disk, tucked away inside the motion.bin file.
So as the next video following my investigation for the "Ryo jumping" mod, here are the unused animations for Ryo's interactions... minus the bicycle.
Edit 2016/10/08: added the bicycle animations contained in the PLYBCYL.MOT file on the Shenmue II disks to the top post.
Ryo pedaling bike
RYOM_RYO_P_BYCICLE_KOG_LP [=RYOM_RYO_0043E_JITENSTA_KOG_LP]
RYOM_RYO_P_BIKE_TATIKOGI_LP
Ryo seated on bike
RYOM_RYO_P_JITENSYA_NORU_LP [=RYOM_RYO_P_JITENSYA_MATAGU_LP], RYOM_RYO_P_BYCICLE_F_0
RYOM_RYO_P_BYCICLE_A_1, RYOM_RYO_P_BYCICLE_A_3
RYOM_RYO_P_BYCICLE_A_2
Ryo mounting bike
RYOM_RYO_P_BYCICLE_NORU [=RYOM_RYO_P_JITENSYA_NORU_F, RYOM_RYO_0043E_JITENSYA_NORU]
RYOM_RYO_P_JITENSYA_NORU_ST [=RYOM_RYO_P_BYCICLE_A_0]
RYOM_RYO_P_JITENSYA_NIGIRU_LP, RYOM_RYO_P_BYCICLE_D_2
Ryo dismounting from bike
RYOM_RYO_P_BYCICLE_ORIRU [=RYOM_RYO_P_JITENSYA_ORIRU_F, RYOM_RYO_0043E_JITENSYA_ORIRU]
RYOM_RYO_P_JITENSYA_NORU_EN, RYOM_RYO_P_JITENSYA_NIGIRU_EN
RYOM_RYO_P_BYCICLE_D_1
Ryo moving bike
RYOM_RYO_P_BYCICLE_D_L_30, RYOM_RYO_P_BYCICLE_D_R_30
RYOM_RYO_P_BYCICLE_G_0, RYOM_RYO_P_BYCICLE_H_0
RYOM_RYO_P_BYCICLE_G_L_45, RYOM_RYO_P_BYCICLE_H_R_45
RYOM_RYO_P_BYCICLE_G_L_90, RYOM_RYO_P_BYCICLE_H_R_90
RYOM_RYO_P_BYCICLE_G_L_180, RYOM_RYO_P_TAOSU_C_TURN180_JITENSYA
RYOM_RYO_P_BYCICLE_E_0
Ryo kicking stand up/down
RYOM_RYO_P_JITENSYA_STAND_UP, RYOM_RYO_P_JITENSYA_STAND_DOWN
RYOM_RYO_P_BYCICLE_C_0