Originalersatzteil

for rear driven pulley, original thickness

For driven pulley, rear, consists two reinforced springs, their higher pressure ensures a higher rpm. At the same time prevents the belt from slipping off.
Not allowed for the RTLR (StVZO)!

reinforced, for pulley in the rear converter, causes a higher pressure and thus a higher speed. At the same time prevents slipping of the V-belt.
Not allowed for the RTL (StVZO)!

For rear, incl. sliding ring bearing. The contrast spring sits no longer on the converter - V- belt pulley when attaching the sliding bearings, which prevents spring twisting. This will significantly reduce the usual vibrations, further this sliding ring causes a substantially better shifting behavior, as well as a quieter motor

Reinforced, for pulleys in the rear converter, causes a higher contact pressure and thus a higher speed. Also prevents the V-belts from slipping.
Not StVZO approved