Originally Posted by
genejockey
Addendum: I ordered a 13/14 mm just like the above from Amazon, to arrive tomorrow. I thought maybe I'd buy a 13/15, but I couldn't gt that tomorrow. So I went with the 13/14. Then I checked the rear wheel, and the cone and locknut there are BOTH 14mm. So I guess it's good I got the13/14.
I typically use regular ol' end wrenches for locknuts.