If you haven’t the necessary strength to propel yourself and need someone to propel the wheelchair for you, a transit wheelchair is the option. Transit wheelchairs have much smaller wheels at the rear, enabling the wheelchair to be pushed and maneuvered more easily by your carer. Smaller wheels allow the wheelchair to be loaded into the boot of a car more easily and quickly, although most self propel wheelchairs now feature quick release wheels.
Wheelchairs are chosen for specific needs. If you are able to propel yourself some of the time, then choosing a self-propelled version might be the better choice. However, it is worth considering the increased width of a self-propelled wheelchair due to the push-rims on the rear wheels, balanced against the available boot space in your car.