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Can I use the Nivex rear derailleur on a standard frame?
The Nivex rear derailleur mounts underneath the chainstay on a special mount. Sorry, it cannot be used with frames that do not have this mount.
Can I convert a 6-8-speed Nivex to the 9-12-speed model?
In theory, you can. The difference are washers and spacers for the derailleur pulleys, plus longer or shorter screws. These parts are available as spare parts. Refer to the exploded diagrams in the instructions.
Can I convert a indexed Nivex shift lever to a different model or to friction?
In theory, you can. The only differences are the indexing discs and spring inside the shift lever. However, disassembling the shift lever—with its many small parts—is something only a very experienced mechanic should attempt.
Does the Rene Herse Nivex work on classic bikes set up for mid-century Nivex derailleurs from France?
You can use the Rene Herse Nivex rear derailleur on classic bikes. The derailleur requires a little filing to fit into the mid-century Nivex braze-on.