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                                                        1. ZT310-R sprocket seat(counterbore positioning) | 
                                
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                                                        2. GB276 deep groove ball bearing 6205-2RS-C0 | 
                                
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                                                        4. ZT310 -T 520-42 T sprocket | 
                                
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                                                        5. ZT310-R 114 section chain (520 oil seal chain) | 
                                
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                                                        6. ZT310-R1 114 section chain (520 oil seal chain/open type) | 
                                
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                                                        7. Non-standard nut M10×1.5(Dacromet) | 
                                
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                                                        8. ZT250-R rear wheel left sleeve φ20×φ30×φ35×12.9 | 
                                
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                                                        9. KD200-C sprocket buffer rubber | 
                                
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