Me ka torque kiʻekiʻe loa o 75Nm a me 250W helu mana mana, kūpono ka CM2503 no ka uila e-city a i ʻole e-trekking bike.Ma muli o ka hoʻolālā ʻana o ka ʻōnaehana ʻelua sensor, loaʻa i ka mea holo ka mana piha i nā manawa āpau a hauʻoli loa.
Kelly 
| Hoʻohana* | eCity，eFolding |
| Nui huila (Iniha) | Koho |
| Kūkulu | Kaʻa kaʻa |
| Voltage koho (DCV) | 36 |
| nT(Rpm) | 110 |
| Mana koho ʻia (W) | 250 |
| nO(Rpm) | 120 |
| ʻO ka ʻoi loa (Nm) | 75 |
| Hoʻoikaika (%) | ≧ 80 |
| Kaumaha(kg) | <2.3 |
| ʻAno walaʻau (dB) | <55 |
| Ka Mahana Hana | -20-45 ℃ |
| Pedal Sensor | Hoʻohui ʻia ka māmā a me ka Torque |
| Paʻa | E-Brake |
| Kaha Kaʻa Māmā (DCV/W) | 12V/6W(Mekiʻe) |
| Nā palapala hōʻoia | CE / FCC / EN15194 / RoHS |
| Nā hoʻāʻo | Paʻa wai: IPX6 Paʻakai Spray Test Standard(h): 96 Standard(h): 96 |
