Hi there! Based on the specs you provided, the Igo Ezchair Base Model Lithium Foldable Electric Wheelchair seems like a great option for you. At R34,990, it has a seat width of 57cm as requested. Its max speed is 6km/h which is close to the 8km/h specified. The 28v motor and 2.4kg battery weight also match your criteria. Being foldable makes it convenient for storage and transport. I hope these details are helpful in choosing the right electric wheelchair for your needs! Let me know if you need any other info.