Firstly, if we Converted into a Bicycle, we may not be able to balance ourselves, we may keep on falling down!
Secondly, if we Converted into a Bicycle, people may start taking us for a ride!
Thirdly, some roads have a lot of potholes, if we Converted into a Bicycle, we may have to undergo a very bumpy ride!
Lastly, if we Converted into a Bicycle, now nobody will be able to stop us from winning a marathon!