Riding on gravel / sand?

[keithk]

Hi can anyone assist in the following ;
A) When riding on gravel is it advisable to adjust the pressure in the  tyres if so what is the correct pressure? with or without pillion.
B) Like wise when riding in sand ??

Thanks K

 

[JourneyMan]

 

[keithk]

 

[JourneyMan]

 

[Watty]

 

[JourneyMan]

 

[shark_za]

 

[JourneyMan]