What size rope do or would you use on class 4 alpine rock if leading some newbies?
I'm leading a group of 3 on a 14k foot peak with a little exposed class 3-4.
One of the three in the group is my regular partner; she and I climb 5.9-10 regularly at crags but very rarely take a rope when climbing class 3-4 peaks. The other two in the group are extremely fit but have never climbed rock or experienced exposure. There are only a few 25-40ft sections that I would potentially have them rope up on, but I may also leave them roped longer using terrain belays if they start freaking out about the exposure or if I need to lower or rap. My current rope selection is as follows:
9.4mm x 70m
10.4mm x 60m
8mm x 30m
I've never tried belaying or short roping two people on one rope and I don't think I want to try with newbies for the first time. Belaying or short roping one at a time seems like a time suck. This leaves me thinking I need two ropes with my partner and I each leading one of the newbies. 70m and 60m seem like way too much rope and the 8mm seems a little thin for alpine rock and terrain belays. I'm feeling like I should chop my 60m or 70m in half, but its so hard for me to cut such expensive ropes.
Any other suggestions? What length and width would you go with?