Without packing a genuine vice-grip, you are doomed! Get a 5 inch size, this can do a variety of gripping tasks including acting as gear lever or hand lever after that wipeout. Please no Chinese versions!
Sorry, Irwin Vice-Grips have been made in China out of the softest Chinesium for several years now, and they're complete junk compared to the old US-made ones. If you can't find an old US-made pair, "Grip-On" is making some pretty decent locking pliers in Spain.
Or, to look at it another way, a crappy Chinese pair of locking pliers is probably fine for your road tools, but at least get them cheap -- don't pay Irwin's prices.
One thing I would add to the list is a small assortment of metric bolts and nuts. I've saved the day many a time with a spare 6mm or 8mm bolt.