Hallo to all.I have an alembic europa 4string bass.I used to play with rotosound RS66LD (45-60-80-105). I order from the net 2 pair of new strings rotosound RS66LF that has 45-60-85-105 strings.The question is if you believe that may i have problem with this cause it has 85 and not 80 and if pressing the bass
thanks to all

I don't think you will have a problem with that slight change in string gauge. If the string set is a different tension to the existing strings you may need to adjust the truss rod slightly to bring the action back to where you like it. If so here is a good place to start reading.
 
http://club.alembicguitars.net/Images/393/2237.html
 
Jazzyvee

Thanks a lot jazzyvee