The park tool sw 13 double ended spoke wrench is a forged double ended spoke wrench designed to fit select mavicreg wheels including ssc ksyrium and crossmax slr wheels precision machined plated and vinyl dipped for comfort and long life park tool sw 13 double ended spoke wrench features smaller end fits 6 spline nipples with a 55mm outside spline diameter and 7mm thread size nipple commonly found on r sys wheels equal to the sizing of the mavicreg m40652 wrench larger end