In reply to Cimi:
> Or should i rather get two half ropes? Also how would it work if i mend to climb in 3 people? Beginning of 1. rope i would tie to me, end of 1. rope and beginning of 2. rope to my partner who will be climbing second, end of 2. rope to my other partner who will be climbing last. That will still leave us climbing all only on a single rope. Is it safe if it is a sport rope. Or correct me if all i say is actually incorrect.
Use what you have but do remember to knot the ends of each before you drop them for each ab and un-knot them before you pull them down. At each belay on the way down thread the 60 through the rings, knot the end then pull it down so you can't drop the ropes.
Personally I'd be happy enough to climb as a 3, I actually prefer it but if you're inexperienced and assuming you're climbing in the northern hemisphere in the depths of winter you may struggle to get 3 people up and down 8 pitches figuring stuff out as you go.
Sharp edges should always be a concern whatever rope you're using especially when abbing as the same spot can rub/saw along an edge. That said, it is just something to bear in mind, not something that should stop you.
Given your two ropes are presumably 10mm not 1mm and therefore almost certainly full ropes you have two basic options: Lead with both clipping each to alternate bolts, bring the seconds up one on each either together (guide mode belay basically essential) or one at a time. Alternatively, lead on the 60, bring the two seconds up together on one rope with one carrying the 50, they can be given a little freedom from each other by tying a 1-2m overhand loop or alpine butterfly a few meters from the end of the rope, one ties/clips into this, the other the end of the rope. Again, guide mode basically essential, you will struggle to catch two falling seconds on one rope otherwise. If the climbing is hard, steep or traversing then bring the seconds up one at a time, the first one up trails the spare rope, clipping it back into the draws as they're passed, last one up strips the clips. Make sure you agree a plan and signals before the leader sets off so nobody is in doubt they're safe to climb.
Stick with what you're comfortable with at the belays for tying in. Personally I'd clove hitch my rope into a locking krab on the belay ring directly, whether seconding or leading then if need be tie a fig8 in the free strand near the bolt for the guide-plate. If it's separate bolts or staples then there are various options but I'm sure you can figure out the one that works for you and what you find on the wall.
Take a torch and don't be afraid to bail early if you're slow.
jk
Post edited at 10:46