Über den Einsatz von SunTour Perfect, Pro Compe und New Winner Schraubkranzfreiläufen: Unterschied zwischen den Versionen

The next photo shows a Perfect body with three splined sprockets and two spacers in place. The red arrow points to one of the splines. The rightmost splined sprocket overhangs the larger-diameter section of the freewheel body, as shown, so that the spacer behind the next, threaded sprocket can secure the splined sprockets.

Perfect and Pro-Compe bodies designed for the narrower Ultra (5mm) spacing have a splined section to accommodate three or four sprockets and their narrower spacers. With some Ultra-spaced freewheels, paper-thin shims are needed in addition to the regular spacers so that the rightmost splined sprocket overhangs the splines and the threaded sprockets secure the splined ones.

With Ultra (5.0mm) spacing, the second-largest sprocket does not overhang the splines of the New Winner body, and so a special 0.9mm thick spacer allows the threaded sprockets to secure the splined ones, as shown in next photo. To engage this narrow spacer, the leftmost threaded sprocket has to have a wide flange.

When building up a SunTour freewheel, it is helpful to have an ample collection of spacers salvaged from disassembled freewheels. Sutherland's Handbook for Bicycle Mechanics, 6th Edition -- still available as a CD-ROM -- includes a complete listing of the different sprockets and spacers.