i know its kinda late but castle nuts on the rims? :3question:if you are talking about the nuts that hold your rims in place then it is a 14mm. if you are talking about castle nuts somewhere else (a-arms, tie rod)on your bike then it is 17mm. good luck :thumbsup:
Maybe it`s not called castle nut but i called it that cause it looks like tie rod castel nut. not one of the 4 nuts holding rim on but the main one in center with cotter pin. Thanks got it off a few days ago.