On my bench, I keep 3 cone wrenches handy....A double ended 13-15 park, a 13 and a 15 single ended cone wrench. I also have a 17mm open end regular wrench for the lock nuts. fits 99% of what I need in a day. I guess that I could get by with just two of the parks 13-15's, but I like the feel of the bigger single ended cone wrenches. Hope that helps.