I am doing my first Century on Saturday and am nervous about my feet. I rebuilt an old Trek 400 a few months ago and have taken it on a few 40 mile rides- love it! Here is the question- my dad and i have the same sized feet and he has some clip ins I could borrow (I think they are for mtn bikes- Shamano SPD's?) I have been doing all of my riding with toe clips. Should I use his Clipless this late in the game? I have ridden clipless before for a 50 mile ride this winter and had no real issues besides falling over my first stop ha ha but that was with a different bike and a more leisurely pace. I am worried I am going to injure myself if I switch what I use this close to the ride but am also worried about not having clip-in pedals and climbing the 6000-9000 ft and bonking. I am in great shape as I am currently a collegiate runner but I am not sure if running shape translates into riding shape. Any suggestions?