I had to
        
 
        
         - drop it uncountable times on both sides
- on muddy grounds
- on gravel
- on rocks
- on pebbles
- at low speed
- at standstill
- at 40mph
 before I finally had to replace the grey plastic 'bumper' parts.
         
        
 ... so ... you really not need to worry about that.
         
         
        
 
         
         
         
         
         It is a really tough bike.
         
        
 HJ