Shu Sugamata:
Semirecumbent S-17
Shu Sugamata:
S-17 Front derailer prototype
Shu Sugamata:
S-17 Front derailer remake
Shu Sugamata:
S-17 Front derailer
Shu Sugamata:
S-17 Rear suspention plan
Shu Sugamata:
S-17 Rear suspention built in
Shu Sugamata:
S-17フルサスペンション
Shu Sugamata:
S-17 Rear suspention& carrier