Park tool double ended spoke wrench sw 13as a manufacturer of bicycle specific tools since 1963 you can safely rely on park tools' many years of experience. The world's largest bike tool manufacturer is the first choice of professional and home bicycle mechanics around the world.featurescomfortable, vinyl dipped, two sided spoke wrench is designed to easily access mavic174 fittings, including the mavic174 ssc ksyrium and crossmax slr wheels. The smaller end fits six splines of the integrated nipples with 5.65mm od splines, and 7mm thread size nipple. These are found on the r sys wheels. This is equal to the sizing of the mavic m40652 wrench. The larger end fits six splines of the 9mm spline od of the threaded eyelets of the fore drilled rim adapters found on rims such as the mavic174 xm819, ex823 and speedcity wheels. This is equal to the sizing of the mavic m40630 wrench. Buy park tool workshop tools from chain reaction cycles, the world's largest online bike store.